Physics - Phywe

Computer-assisted Experiments for 

Natural Sciences 

PHYSICS · CHEMISTRY · BIOLOGY · TECHNOLOGY

Computer-assisted experiments with Cobra3 

The Cobra3 system consists of numerous 

components, which are optimally matched 

with each other and fulfil all your wishes. 

Whether physics, chemistry or biology, 

demonstration experiment, student 

experiment or use in practical training: 

Cobra3 always precisely satisfies your 

needs! 

Demonstration experiment 

With the DISPLAY UNIT is also very easy to use for 

demonstration experiments. Up to 4 measured variables 

can be displayed simultaneously with max. 

2 DISPLAY-UNITs! 

Direct sensor connection 

Direct connection of further measuring sensors. Fully 

automatic sensor recognition prevents errors! 

Particular importance has been placed in 

fast and easy experiment setup, extremely 

stable equipment connections and very easy 

use. Phywe “measure” measurement 

software also enables simple and reliable 

data recording, analysis and further 

processing. 

"measure" measurement 

software with fully automatic 

hardware-recognition! 

Simply connect to the PC and measure! The “measure” 

software automatically recognises the connected 

hardware. 

Automatic module recognition 

Measuring modules for all relevant measured variables. 

Fully automatic module recognition prevents sources 

of errors! 

2 x Timer/Counters 

Both inputs can be used as a time measurer, counter 

or as a TTL input. One input also as “Counter with gate 

time”. Digital sampling rate: 4 MHz

Can be variably adapted to your needs! 

Measuring 

without PC 

With the Cobra3 

COM-UNIT can also be fully used 

without a computer! 

Safe power supply 

5 V fixed voltage output: so that the 

Light barriers are not damaged! 

100 % stable 

Up to 8 UNIT´s can be 

cascaded 

100% stable thanks to snap 

connection. Up to 8 measuring 

UNITs can be connected 

simultaneously. (Cascading!) 

Demonstration Experiment 

Numerous fixing facilities for 

fixing to stands. Optimum for 

demonstration experiments! 

Demonstration class 

Without PC: COM-UNIT + measuring UNIT = Digital 

multimeter. With additional DISPLAY-UNIT: full quality 

demo multimeter! 

Control Input/Output 

Light barrier connected as drop counter or to 

control a motor piston burette. 

Conductivity measurement pH - measurement 

Simultaneous measurement of both variables 

possible through electrical isolation 

of the pH/potential and conductivity inputs! 

500.000 Hz 

data recording 

Super-fast analog data recording 

ensures very good measuring 

results! In many experiments a 

good replacement for an 

oscilloscope! 

PC interface 

PC interface for 

communication between 

Cobra3 and the PC. 

Recorder output 

For connecting Yt recorder or 

voltmeter. For analogue 

presentation of the measured 

values.

Student Experiment 

for... 

Demonstration 

Experiment 

Physics 

Biology 

Chemistry 

Laboratory 

Experiments

Cobra3: The System 

From the Cobra3 UNITs to the measuring modules and sensors, “measure” measurement software and the experiment literature, all 

elements of the Cobra3 system are optimally matched with each other, from A – Z. 

All system components can be very easily and precisely put together, just as you like! 

4 Cobra3 UNITs Measuring modules Measuring sensors 

“measure” measuring 

software 

Over 200 FREE experiments with 

preset measuring parameters, 

measuring curves and detailed 

descriptions 

Over 200 experiment 

descriptions 

Accessories 

Demonstration displays 

?????? 

For more 

information please 

contact your sales 

partner on the 

backside of 

this brochure. 

NOTE: A more detailed overview of the measured variables, sensors, etc. is given in the fold-out page at the end of the brochure! 

TIP: You can keep this fold-out page open while working with this brochure. This will enable you to see which equipment and 

software you require if you want to measure and display a specific measured variable. This overview also contains details of pages, 

which helps you to quickly find the required equipment in the brochure. 

1

Cobra3 UNIT´s 

Cobra3 BASIC-UNIT 12150.00 

Very fast Interface for measurements or open-loop and closed-loop control in physics, chemistry, biology and technology. Can be used either in 

conjunction with a PC (serial interface) or – without a PC – together with the Cobra3 COM-UNIT. With USB adapter also connection to USB interface 

possible. Can be combined with Cobra3 CHEM-UNIT, Cobra3 COM-UNIT with or without Cobra3 DISPLAY-UNIT. Can be extended by additional 

measuring modules and sensors for nonelectrical measuring quantities. The range of functionality can be updated through the RS 232 interface. 

Shock-resistant plastic housing with support bases, a wide range of fixing possibilities and lateral connectors for connecting further units. Measure 

up to 4 parameters simultaneously. 

1. Very fast! Sampling rate: 500.000 Hz! 

2. 5 analog inputs, use 3 simultaneously! 

3. 2 digital inputs (2 x Timer/Counter), sampling rate 4 MHz 

2 

Collective connector for plug-in 

modules for measuring forces, 

magnetic fields, temperatures, pHvalues, 

luminous intensities, ... 

Lateral connection socket for cascading 

several BASIC-/CHEM-UNIT´s and for 

future extensions 

Ground-related analog input (± 30 V, 

± 10 V), 12 bits 

Sensor ports S1 and S2 allowing to 

connect those sensors directly which 

do not require any measuring module. 

Using the Cobra3 measuring module 

converter and an extension cable it is 

also possible to connect measuring 

modules to these ports. 

Cobra3 BASIC-UNIT – All advantages at a glance: 

Technical data: 

7 measurement inputs, with: 

5 analog inputs (use 3 inputs simultaneously) 

– Modul port: ±10 V 

Connection: Sub-D- connector, 25-pin type 

– Sensor port 1: ± 30/10 V 

Connection: 4 mm sockets, Sub-D-connector, 9-pin type 

Input ground-related 

Input impedance > 500 k 

– Sensor port 2: ±30/10/3/1/0,3/0,1 V 

Connection 4 mm sockets, Sub-D-connector, 9-pin type 

Differential input floated 

Input impedance 1 M 

– Valid for all analog inputs: 

Sampling rate max. 500.000 Hz 

Online mode up to approx. 5 kHz 

Burst mode 5 Hz – 500.000 

Resolution 12 bits 

Overvoltage protection 230 V AC 

Triggering adjustable 

2 digital inputs: 

Timer/Counter 1 and Timer/Counter 2 

Counting capacity 32 or 40 bits 

Sampling rate 1 MHz or 4 MHz 

Connection 4 mm sockets 

Configuration possible for: 

TTL signals: timer-counter/counter 

Analog signals counter / counter 

4. Measure up to 4 parameters simultaneously! 

5. more than 200 detailed described experiments! 

6. combine it with Cobra3 CHEM-UNIT, COM-UNIT and DISPLAY-UNIT 

Analog output (included in module ports) 

Voltage range ± 10 V 

Resolution 12 bits 

Connection Sub-D-connector, 9 or 25-pin type 

Voltage output (e.g. for light barriers): 

Fixed voltage 5 V / 0.2 A 

Connection 4 mm sockets 

Your advantage: Due to fixed voltage of 5 V no destroying of light barrier possible! 

General data: 

RS 232 interface Sub-D-connector, 9-pin type 

Bit rate max. 115200 bit/s 

Data storage capacity 12000 values 

Connection of further units edge connectors, 48-pin type 

Voltage supply 12 V / 6 W 

Connection low-voltage socket 

Housing dimensions 190 x 135 x 90 mm 

Weight: 0.4 kg 

Smoothed DC voltage source 5 V–/ 

0.2 A for a direct supply of light barriers, 

indicator lamps or other consumers 

Connector for an external voltage 

supply (12 V–/ 2 A) (If the Cobra3 

BASIC-UNIT is combined with other 

UNIT´s, they require only one external 

voltage supply) 

Bus system for the communication with 

the Cobra3 COM-UNIT 

Sub-D connector, 9-pin type, for the 

serial RS232 communication with a 

PC! With adapter connection to USB 

interface possible. 

2 timers or 1 timer and 1 counter 

(TTL IN) 

Switchable differential analog inputs (± 30 V, 

± 10 V, ± 3 V, ± 1 V, ± 0.3 V, ± 0.1 V), 12 bits


Cobra3 CHEM-UNIT – The entire Chemistry in just one box! 12153.00 

Especially developed Interface for measurement applications in the field of chemistry. Can be used either in conjunction with a PC 

(serial interface) or – without a PC – together with the Cobra3 COM-UNIT. With USB adapter also connection to USB interface possible. 

Can be combined with Cobra3 BASIC-UNIT, Cobra3 COM-UNIT with or without Cobra3 DISPLAY-UNIT. The range of functionality can 

be updated through the RS 232 interface. Shock-resistant plastic housing with support bases, a wide range of fixing possibilities and 

lateral connectors for connecting further units. Measure up to 8 parameters simultaneously. 

Smoothed DC voltage source 5 V–/ 

0.2 A for a direct supply of light barriers, 

indicator lamps or other consumers. 

100% stable connection of several units 

through interlocking connectors. The 

units can also be fixed on top of each 

other by sliding holders. 

Lateral connection socket for cascading 

several BASIC-/CHEM-UNIT´s and for 

future extensions 

6 ranges of measurement (adjustable 

and autorange), sensors with 4-mm 

plugs or diode plugs connectable. 

Termperature (T4) integrated in diode 

socket. 

Cobra3 CHEM-UNIT – All advantages at a glance: 

1. The entire Chemistry in just one box! 

2. 10 measurement inputs, 8 simultaneously! 

3. pH/Potential and Conductivity are electrically 

isolated from each other 


10 measurement inputs: 

Analog In: 3 ranges of measurement 

± (3,2 V; 32 V; 81 V) 

adjustable and autorange) 

4 mm-sockets 

pH/Potential: 0...14 pH (0,01 pH) 

-2200...+2200 mV (±1 mV) 

input resistance: 10 12 

BNC socket 

Conductivity: 6 ranges of measurement 

(adjustable and autorange) 

0 ... 20 µS/cm 

20 ... 200 µS/cm 

0,2... 2 mS/cm 

2 ... 20 mS/cm 

20 ... 200 mS/cm 

200 ...1000 mS/cm 

4 mm-sockets and diode socket 

(The inputs pH/Potential and Conductivity are electrically 

isolated from each other) 

4. More than 50 detailed decribed experiments! 

5. combine it with Cobra3 BASIC-UNIT, COM-UNIT 

and DISPLAY-UNIT 

Temperature T1, T2, T3: for NiCr-Ni-Thermocouples 

-100°C ... +1500 °C 

NiCr-Ni-DIN-socket (Typ K) 

Temperature T4: for Pt1000 sensor 

-100 °C ... +850 °C 

(integrated in the diode socket for conductivity 

measurements) 

Temperature T0: temperature sensor integrated in the housing 

-25 °C ... +85 °C 

TTL In/Out: TTL signal for drop counter or for controlling a 

motor piston burette 

4 mm-sockets 

Voltage output: 5 V / 0,2 A (e.g. for light barrier as drop counter) 

4 mm-sockets 

Connections: RS 232C-D-SUB-9 jack up to 115 200 baud 

Voltage supply: 12 V low voltage jack for plug-in power supply unit 


Connector for an external voltage 

supply (12 V–/ 2 A) (If the Cobra3 

CHEM-UNIT is combined with other 

UNIT´s, they require only one external 


Analog In: 3 Measurement ranges 

(adjustable and autorange) 


the Cobra3 COM-UNIT 

TTL In/Out: TTL signals for drop counter 

or for controlling a motor piston burette 

Sub-D connector, 9-pin type, for the serial RS232 

communication with a PC! With adapter connection 

to USB interface possible. 

pH/Potential: 0..14 pH, -2200...+2200 

mV, Connection: BNC socket 

T1, T2, T3: 3 x Temperature measurement 

possible with NiCr-Ni sensors 

3


1. Cobra3 WITHOUT a computer possible! 

2. up to 8 BASIC-UNIT´s and/or CHEM-UNIT´s can be connected! 

3. display 4 parameters simultaneously 

4. -numeric display 

Cobra3 DISPLAY-UNIT 12150.00 

With the Cobra3 DISPLAY-UNIT, you can extend your Cobra3 System to a fully functional demo-multimeter. The two large 5-digit 

displays with a digitheight of 20 mm are supplemented by a dot matrix display, which shows the corresponding unit for the values. 

Two additional LED displays above the measured values show you the respective measuring channel, via which the illustrated current 

values are recorded. In combination with Cobra3 BASIC-UNIT or CHEM-UNIT with Cobra3 COM-UNIT all measured values can be 

displayed. Using the software modul “PowerGraph you can connect the DISPLAY-UNIT directly to the PC. Then Data cable, socket/socket, 

null modem (14603.00) is necessary. 


UNIT with two 5-digit 20-mm LED displays for digital and LED dot matrix 

displays for demonstrating units and two dot matrix displays for demonstrating 

the selected measurement channels. 

4 

Cobra3 COM-UNIT 12152.00 

For using the Cobra3 BASIC-UNIT or CHEM-UNIT without a computer. Easy connection to the BASIC-/CHEM-UNIT by plugging it into the lateral edge 

connector. LCD display with background lighting for selecting and presenting the measurement data. It is possible to connect the Cobra3 DISPLAY- 

UNIT or large-format displays for demonstration purposes. Selection wheel for a comfortable use of the menu and for entering data. The operating 

and evaluation routines can be updated through the RS232 interface. Shock-resistant plastic housing with support bases, a wide range of fixing 

possibilities and lateral connectors for connecting further units. 

Large-format LCD display with 

background lighting for displaying the 

measurement data and menu 

Contrast adjustment of the LCD display 


Cobra3 UNITS 

Recorder output (0...3 V) for connecting 

y-t-recorders or voltmeters. The output 

voltage is always proportional to the 

value displayed or selected. All 

measuring quantities (forces, magnetic 

fields, pH-values…) are converted 

automatically into voltages. 


LCD display with graphic 

capability: 

Resolution: 128x64 pixel 

Contrast: adjustable 

Background lighting: 

LED, can be deactivated 

Cobra3 COM-UNIT – All advantages at a glance: 

Connections: 2 RS 232C-D-SUB-9 plugs for 

connecting up to the Cobra3 COM UNIT via 

a cable or for connecting up to 2 hand-held 

devices or 

1 balance with 9600 Baud 

1 RS 232C-D-SUB-9 jack for connecting an 

additional Cobra3 DISPLAY UNIT 

1 48-pin system plug for direct connection to the 

Cobra3 COM-UNIT 

Supply: 12V 

Extra-low voltage jack for plug-in power supply unit 

Connectors for: 

DISPLAY-UNIT or large Sub-D-connector, 

9-pin type format display: 

Units: edge connector, 48-pin type 

RS 232 interface: Sub-D-connector, 9-pin type 

Voltage supply: low-voltage socket 

tY-recorder: 4 mm sockets 

Connector for an external voltage supply 

(12 V– / 2 A) (If the Cobra3 COM-UNIT 

and the Cobra3 BASIC-/CHEM-UNIT are 

combined, they require only one external 


Sub-D-connector, 9-pin type, for 

connecting up to four digital large-format 

LED displays or two DISPLAY-UNIT´s 

Sub-D-connector, 9-pin type, can be 

connected to the RS232 interface of a 

PC in order to update the COM-UNIT. 

Push-buttons and adjusting wheel for 

working with the menu 

General data: 

Recorder output: 0…3 V 

Voltage supply: 12 V / 2 W 

Housing dimensions: 

190x135x90 mm 


5. intuitive and easy use of the menu 

6. measured values can be displayed on Display 

7. combined with the DISPLAY-UNIT a fully functional demo multimeter 

Cobra3 DISPLAY-UNIT – All advantages at a glance: 

1. Can even be seen from the back row! 

2. can be fixed on different support material 

3. Using the software modul “PowerGraph you can connect the DISPLAY-UNIT 

directly to the PC. Then, data cable, null modem 14603.00 necessary! 

4. up to 2 DISPLAY-UNIT´s (= 4 values) can be connected!

Experimental descriptions Cobra3 

– detailed, easy and for all topics in the field of Physics, Chemistry and Biology! 

More than 200 experimental descriptions are available for all topics in the field of Physics, Chemistry and Biology! Furthermore you 

can find the experimental descriptions installed on the CD-ROM measure (14500.00). All these experimental descriptions can be used 

free of charge. 

Just select the experiment you want and the measuring parameters, measuring diagrams and descriptions (pdf-file) are 

loaded automatically. There´s no easier way! 

Experimental objective 

The first section gives a short description of the 

meaning, the purpose and the teaching objectives 

of the experiment 

Material list 

The complete list of required 

equipment for the experiment 

CD-ROM measure 

with more than 

200 installed free 

experiments! 

(Art.Nr. 14500.00) 

01310.02 

Handbook Cobra3 

Physics, Computerassisted 

experiments with 

Cobra3 

01320.02 

Handbook Cobra3 

Chemistry/Biology, 

Computerassisted 

experiments with 

Cobra3 

Ciruit diagram 

The diagrams help to 

understand the laying of the 

cables and the signal paths in 

electrical or electronic 

experiment set-ups. 

Measuring 

parameters 

Suggestions for the 

measuring parameters 

support you for a quick and 

successful realisation of the 

experiment 

TIP: Select one of the more 

than 200 installed 

experiments and the 

experimental parameters 

are loaded automatically! 

There´s no easier way! 

Photo of experiment 

A photo of the experimental 

set-up facilitate the 

installation and 

Experimental procedure 

The experimental procedure and 

evaluation is explained step by 

step 

Measuring results 

Facts and formulas about 

the experiment and the 

results a successful 

realisation of the experiment 

5

Applications Cobra3 COM-UNIT 

6 

Cobra3 without Computer 

Cobra3 BASIC-UNIT Cobra3 CHEM-UNIT 

+ Cobra3 COM-UNIT + Cobra3 COM-UNIT 

= Digital-Multimeter = Digital-Multimeter 

Cobra3 BASIC-UNIT Cobra3 CHEM-UNIT 

+ Cobra3 COM-UNIT + Cobra3 COM-UNIT 

+ Cobra3 DISPLAY-UNIT + Cobra3 DISPLAY-UNIT 

= Digital Demo-Multimeter = Digital Demo-Multimeter 

By using the Cobra3 COM-UNIT, NO computer is required to record the measured values 

All the Cobra3 BASIC and CHEM-UNIT inputs are analysed and displayed by the COM-UNIT 

Really easy to use thanks to menu controls – all functions can be easily selected using a setting wheel and 

pushbuttons! 

The individual units can all be securely connected with each other and can be easily and safety carried as 

a single unit to the place of measurement! 

Experiment example: Weather station 

Simultaneous measurement of: 

• Pressure 

(Pressure measuring module at port module) 

• Relative air humidity 

(air humidity sensor directly at the S1 sensor port) 

• Temperature 

(semi-conductor temperature sensor directly 

at the S2 sensor port) 

• Wind speed (no picture) 

(Wind sensor, 4-mm plugs) 

100% stable! 

The following devices can be replaced by using 

the Cobra3 COM-UNIT: 

- Stop clock - Dynamometer 

- Digital counter - pH-meter 

- Geiger counter - Lux meter 

- Voltmeter - Oxygen meter 

- Thermometer - Conductivity meter 

- Hygrometer - Potential meter 

- Barometer + Combination of these devices 

- Teslameter

Applications Cobra3 COM-UNIT 

Cobra3 without Computer 

Cobra3 COM-UNIT applications! 

Digital multimeter in student experiment 

With its robust design and 100% secure connection of the UNITs, 

the Cobra3 is also ideally suited for student experiments. 

The fold-out stand bases also enable the UNITs to be placed on 

the table at an angle, which makes experimenting even more 

convenient! 

Only 3 steps to the new measuring 

device: 

1. Plug together the BASIC or CHEM-UNIT and COM-UNIT! 

2. Plug the NiCr-Ni measuring module with NiCr-Ni sensor 

on the module port of the Cobra3 BASIC-UNIT! 

3. Which measuring channel (port) is to be displayed large 

in the LCD display? If a DISPLAY-UNIT is connected this 

value can of course also be viewed on the display by 

pressing a button! 

COM-UNIT menu control! All values easily 

and fast at the press of a button! 

To measurement channel selection! Select module or sensor! 

Real digital demo Multimeter 

Used in conjunction with the Cobra3 DISPLAY-UNIT, the Cobra3 

system is ideally suited for demonstration classes. 

Up to 2 DISPLAY-UNITs can be connected at the same time, i.e. 

4 measured values can be displayed in parallel. 

Through diverse fixing facilities on the equipment, the UNITs can 

always be very easily, quickly and securely fastened. 

Conjunction of the UNIT´s. 100% stable! 

open pull 

put together push in Ready! 

Show measured value in the LCD 

Display or transfer to the 

DISPLAY-UNIT 

7

Measuring software measure 

8 

“measure” measuring software. The intuitive to use measurement software for teaching! 

“measure” measurement software, CD-ROM Art. No. 14500.00 

Phywe’s measurement software “measure” is divided into 2 areas: 

1. Free main program for displaying measured values and data analysis 

2. Measurement programs for Phywe measuring units for data recording. 

FREE main program for data input and analysis 

Freeware 

FREE Update and Demo 

Version in the Internet: 

http://www.phywe.com 

1. Free, extensive main program (for issuing to pupils, students, etc.) Analysis possible 

at home! 

2. Free! Over 200 experiment descriptions with preset measuring parameters, measuring 

curves and experiment descriptions as a pdf file 

3. 4 free possibilities for data input via: 

1. Functional regulation 2. Manual data input, 

3. Graphic data input 4. Data import via clipboard 

(e.g. Excel, Word, etc.) 

4. Data export/import (measured values and graphics) from/to standard Windows 

programs (Word, Excel, PowerPoint, etc.) via clipboard 

5. Free! Can be used in mathematics lessons for discussing curves! 

6. Easy, intuitive use of the software through compliance with the Microsoft standard 

7. One main program for all UNITs, modules, sensors and 

other Phywe measuring equipment with PC interface 

8. Large functions library 

Analysis: zeros, extreme values, areas, etc. 

Zoom, measure, cut, mark, label, etc. 

Fourier analysis and channel conversion 

Smooth/level, mean value, linear regression, curve fitting, etc. 

Function generator; data can be played back with sound card! 

With Phywe you only pay for the precise software you need! Nothing more! 

Art. No. Product name Art. No. Product name 

14400.61 Software Conductivity meter 

14507.61 Software Cobra3 Lux 14510.61 Software Cobra3 pressure 

14403.61 Software Work/power measuring device 14511.61 Software Cobra3 timer/Counter 

14405.61 Software Temperature measuring device 4-2 14512.61 Software Cobra3 transl./Rotation 

14406.61 Software for electric field meter 14514.61 Software Cobra3 frequency analysis 

14407.61 Software for X-ray unit 35 kV 14515.61 Software Cobra3 force/Tesla 

14408.61 Software pH-measuring unit DEMO 14516.61 Software Cobra3 gas laws 

14409.61 Software Demo multimeter 14518.61 Software Cobra3 weather station 

14415.61 Software hand-held measuring device - oxygen 14520.61 Software Cobra3 CHEM-UNIT 

14416.61 Software hand-held measuring device - pressure 14521.61 Software Cobra3 Hall effect 

14417.61 Software hand-held measuring device - Lux 14522.61 Software Franck-Hertz experiment 

14418.61 Software hand-held measuring device - conductivity 14523.61 Software goniometer 

14419.61 Software hand-held measuring device pH/Potential 14524.61 Software multi-channel analyzer 

14420.61 Software hand-held measuring device -2 x NiCr-Ni 

14450.61 Software PHYCON USB interface 

14451.61 Software stepped motor 

14470.61 Software balance 

14503.61 Software Cobra3 temperature 

14504.61 Software Cobra3 universal recorder 

14505.61 Software Cobra3 oxygen 

14525.61 Software Cobra3 PowerGraph 

14506.61 Software Cobra3 radioactivity 

14508.61 Software Cobra3 conductivity 

14509.61 Software Cobra3 pH/potential 

14509.61 Software Cobra3 pH/potential 

Upgradable 

Our philosophy: Individual, cost-effective software 

modules for your precise requirements. Your advantage: 

1. You only pay for the software module(s) you want 

to use! 

2. You only see the extent of software you require. 

Everything not necessary for your application doesn’t 

even appear! 

3. Further, software functions required in future can 

be easily added later! 

4. Both the firmware of the units and the software 

modules can be updated FREE at any time over the 

internet! You profit from free software developments! 

5. You can install all software module as demo version! 

Even more convenience: PowerGraph software module: Graphic presentation of the hardware 

The PowerGraph software module helps you to obtain optimum measured results even 

faster, easier and more conveniently. Its outstanding features are: 

1. Automatic sensor and module recognition, graphic display of the connected hardware! 

2. Any combination of all measured variables 

3. Connected measuring modules and sensors can be easily configured! 

4. Measurements can be repeated at the touch of a button! => All measurement curves 

in one graph! (e.g. for accelerated movement with different masses, etc.) 

5. Any measured variable can be selected for the X-axis (XY graph) 

6. Return values (relations) can be displayed! e.g. magnetic hysteresis, Lissajous figures, 

etc. 

7. “Virtual measuring channels” enable online conversion of measured values (e.g. conversion 

from °C to K) or off-setting measured values of different measuring channels (e.g. 

calculation, display of the resistance from current and voltage, etc.)


Data recording with Phywe measuring units – one software for all measuring units – it couldn’t be easier! 

Apart from the Cobra3 interface system there are numerous other Phywe measuring devices which have with a PC interface. The 

advantage: The data recording and data evaluation for all devices can be performed using the “measure” measuring software! 

Two possible ways to measure! 

A. Configure experiment yourself B. Select experiment with preset measuring 

parameters! 

1. Select measuring device 1. Select from over 200 pre-installed experiments, 

free! 

e.g. Cobra3 temperature e.g. specific thermal capacity of solid bodies (P1349400) 

Automatically open: Measurement curves and experiment 

descriptions as a pdf file, the measurement parameters are loaded 

in the background! 

2. Configure measurement 2. Start measurement: 

You can adjust the measurement Parameters are preset and can be easily changed by you if required 

parameters in the measurement window! 

Then click on! Otherwise simply click on 

If you want to precisely repeat the settings 

you can save them in a file and call them 

up again later! 

3. Measurement (the same for both measurement methods!) 

In both measurement methods you can easily select between analogue display, digital display or diagram 

to display the measured values! 

The following Phywe measuring units are 

available with an interface: 

1. X-ray unit 35 kV 09058.99 

2. PHYCON, starter USB interface 12500.00 

3. pH-Meter, demo 13702.93 

4. Work and power meter 13715.93 

5. Demo multimeter 13721.93 

6. Temperature measuring unit 4 – 2 13617.93 

7. Goniometer unit 13903.99 

8. Conductivity measuring device 13701.93 

9. Multi-channel analyser 13726.99 

10. Franck-Hertz unit 09105.93 

11. Electric field meter 11500.10 

12. Hand-held measuring device - oxygen 07135.00 

13. Hand-held measuring device - pressure 07136.00 

14. Hand-held measuring device - Lux 07137.00 

15. Hand-held measuring device - conductivity 07138.00 

16. Hand-held measuring device pH/potential 07139.00 

17. Hand-held measuring device - 

temperature 2xNiCr-Ni 07140.00 

A more detailed overview of the individual measuring 

devices is given at the end of this brochure. 

9

Measurement software 

Measured value analysis with the “measure” measurement software – innumerable 

analysis and display possibilities! And all free of charge! 

The extensive functions library of “measure” measurement software ensures the flexibility and diversity expected of powerful modern 

software! 

10 

Up to 16 measurem. curves can be displayed simultaneously! 

Click on the relevant button to individually activate or deactivate 

each measurement curve. Functions and relations can be 

displayed! 

Choose from over 200 experiments! 

Under File > Open experiment you can choose from over 200 

experiments. The measurement curves, measurement 

parameters and detailed experiment description are 

automatically opened as a pdf file. 

Simply double click on a measurement curve! 

And you are directly in the display options and e.g. can change 

line thickness, colour, axis scaling, and much more. 

Save and print measured values! 

All measured series can be saved in their own files. Measured 

values can be printed as a graph or tables of values. 

Analysis tools: 

Peak analysis, curve analysis, mean value, gradient, 

integral, extreme values, play back measurement, Fourier 

analysis, curve fitting, scale curves, equivalent point, smooth, 

measure curves, linear regression 

Display tools: 

Cursor, zoom, set marking, display coordinates, X- and Y-axis 

can be freely moved and scaled with mouse! 

Measurement channel manager 

All measurement series can be plotted against each other in 

any combination using the measurement channel manager. 

Channel conversion using functions such as: 

+-*/, abs, x^y, sqr, sqrt, sin, cos, tan, arcsin, arccos, arctan, 

logarithms, constants: e, , smoothing measured value series, 

delete measured values. 

Export data 

Measured values can be copied into the clipboard as a graph 

or numbers and can therefore be transferred to other programs 

such as e.g. Excel, Word, PowerPoint, etc. 

Generate new measured value columns 

New columns are inserted in the table of values by 

mathematical conversion of the measured series. 

Mathematically converted measured series are treated as 

original measured series 

Screen shot function for freely selectable sections 

Use the “Crtl + Shift” key combination to transfer and display 

a selected area into an independent window. Here you can 

highlight important facts in a striking way! Ideal for use in 

class!


“measure” measuring software – experimenting with measure is so easy! 

Measuring example: Generation of an alternating voltage, rectification and smoothing (P1331300) 

You can now choose between two possibilities! 

1. Setup experiment! 

Simply setup the experiment. The Phywe experiment descriptions 

describe precisely what you need and how to set it out! 

Easy and fast setup thanks to 

detailed experiment descriptions: 

Photo and Circuit diagramm! 

A. Configure yourself! B. Open preset experiment 

2. Select measuring parameters! The correct measuring parameters are 

Simply select measuring devices in the software, automatically loaded. 

define measurement parameters and off you go! 

3. Start measurement! 

During the measurement you can choose between analogue 

display, digital display and diagram. 

You can of course combine all three if you want! 

Convenient and reliable 

measurement through preset 

measuring parameters! 

4. Analysis of measurement! 

Numerous analysis tools provide you 

with many analysis, display and 

calculation possibilities! 

11

Physics: Experiments Mechanics 

Exp-Nr. Experiment description 

P1330100 Frequency of a spring pendulum with Cobra3 BASIC-UNIT 

P1330200 Frequency of a thread pendulum with Cobra3 BASIC-UNIT 

P1336900 Free fall with a screen with Cobra3 BASIC-UNIT 

P1337000 The path-time law for free fall with the falling sphere apparatus with Cobra3 BASIC-UNIT 

P1337100 Uniform, linear, unaccelerated motion with Cobra3 BASIC-UNIT 

P1337200 Force-free, linear motion with Cobra3 BASIC-UNIT 

P1337300 Uniformly accelerated, linear motion, Newton`s 2nd law with Cobra3 BASIC-UNIT 

P1337400 The elastic collision with Cobra3 BASIC-UNIT 

P1337500 The inelastic collision with Cobra3 BASIC-UNIT 

P1337600 Frequency of a thread pendulum with Cobra3 BASIC-UNIT 

P1337700 Pendulum oscillations-variable g pendulum with Cobra3 BASIC-UNIT 

P1337800 The harmonic oscillation of helical springs-parallel and series connection of spring with Cobra3 BASIC-UNIT 

P1337900 Dependence of the oscillation period of a leaf spring on the pendulum length & pendulum mass with Cobra3 BASIC-UNIT 

P1338000 Moment of inertia of different bodies:disc,solid and hollow cylinder - Steiner`s law . with Cobra3 BASIC-UNIT 

P1338100 Uniform rotary motion with Cobra3 BASIC-UNIT 

P1338200 Uniform, accelerated rotational motion, moment of inertia with Cobra3 BASIC-UNIT 

1) P2130111 Hooke's law with Cobra3 BASIC-UNIT 

1) P2130311 Newton`s 2nd law / Air track with Cobra3 BASIC-UNIT 

1) P2130315 Newton’s 2nd law / Demonstration dynamics and motion track with Cobra3 BASIC-UNIT 

1) P2130511 Laws of collision / Air track with Cobra3 BASIC-UNIT 

1) P2130515 Laws of collision / Demonstration dynamics and motion track with Cobra3 BASIC-UNIT 

1) P2130711 Free fall with Cobra3 BASIC-UNIT 

1) P2131311 Moment of inertia and angular acceleration with Cobra3 BASIC-UNIT 

1) P2131315 Moment of inertia and angular acceleration with Cobra3 BASIC-UNIT 

1) P2131611 Centrifugal force with Cobra3 BASIC-UNIT 

1) P2132311 Variable "g" pendulum with Cobra 3 with Cobra3 BASIC-UNIT 

1) P2132511 Coupled Pendula with Cobra3 BASIC-UNIT 

1) P2132611 Harmonic oscillations of spiral springs -Spring linked in parallel and series with Cobra3 BASIC-UNIT 

1) P2132711 Forced Oscillations -Pohl`s Pendulum with Cobra3 BASIC-UNIT 

1) P2132811 Moments of inertia of different bodies / Steiner`s theorem with Cobra3 BASIC-UNIT 

1) P2140611 Surface tension by the pull-out method with Cobra3 BASIC-UNIT 

1) P2150311 Velocity of sound in air and in metal rods with Cobra 3 with Cobra3 BASIC-UNIT 

1) P2150411 Acoustic Doppler effect with Cobra3 BASIC-UNIT 

1) P2150811 Resonance frequencies of Helmholtz resonators with Cobra3 BASIC-UNIT 

1) P2150911 Interference of acoustic waves, stationary waves and diffractio n at a slot with Cobra3 BASIC-UNIT 

1) P2152111 Determination of the velocity with Cobra3 BASIC-UNIT 

1) detailed scientific description (only in english) 

Uniformly accelerated, linear motion, Newton´s 2nd law 

P1337300 Measurement of: Distance, time, velocity, acceleration 

12 

Phywe Advantage: 

• very good measuring results with this nearly frictionless 

air track 

• 1 MHz time resolution for digital inputs 

The path-time law for linear movement with uniform 

acceleration is a parabola in the path-time coordinate 

system. The velocity-time law states that the velocity of 

a body is proportional to the time. The acceleration is a 

straight line that runs parallel to the time axis. If the 

acceleration is achieved by a mass falling in the Earth´s 

gravitational field, the law of conservation of energy 

applies. This law states that a any point in time the sum 

of the potential energy of the falling mass and the kinetic 

energy of the acceleration is constant. 

Material list Art.No. Quantity 

Cobra3 BASIC-UNIT 12150.00 1 

Power supply 12V/2A 12151.99 1 

Data cable, plug/socket, 9 pole 14602.00 1 

Software Cobra3 translation/rotation 14512.61 1 

Light barrier, compact 11207.20 1 

Air track rail 11202.17 1 

Blower 230V/50Hz 13770.97 1 

Pressure tube, l= 1.5 m 11205.01 1 

Glider for air track 11202.02 1 

Starter system 11202.13 1 

+ other laboratory material

Physics: Experiments Mechanics 

Coupled pendula 

P2132511 Measurement of: Amplitude, periodic time 

Two equal gravity pendula with a particular characteristic 

frequency are coupled by a "soft" spiral spring. The 

amplitudes of both pendula are recorded as a function 

of time for various vibrational modes and different 

coupling factors using a y/t recorder. The coupling 

factors are determined by different methods. 


Pendulum w. recorder connection 02816.00 2 

Helical spring, 3 N/m 02220.00 1 

Rod with hook 02051.00 1 

Weight holder f. slotted weights 02204.00 1 

Slotted weight, 10 g, black 02205.01 5 

Capacitor, 10 mF/35 V 39105.28 2 

Cobra3 Basic Unit 12150.00 1 

Power supply 12 V 12151.99 1 

Cobra3 Universal writer software 14504.61 1 

RS 232 data cable 14602.00 1 

Power supply 0-12 V DC/6 V, 12 V AC 13505.93 1 

+ other laboratory material 

The harmonic oscillation of helical springs – parallel and series connection of springs 

P1337800 Measurement of: Time, Vibration 

From the period of the oscillation and the suspended 

mass, the spring constant D is determined for varying 

experimental arrangements. 




Data cable,plug/socket, 9 pole 14602.00 1 

Softw. Cobra3 translat./rotation 14512.61 1 


Tripod base -PASS- 02002.55 1 

Support rod-PASS-,square,l=1000mm 02028.55 1 

Stand tube 02060.00 1 

Rod with hook 02051.00 1 

Right angle clamp -PASS- 02040.55 2 

Helical springs, 3N/m, 10 pcs 02220.03 2 

Helical spring, 20 N/m 02222.00 1 

Connecting cord,1000 mm, red 07363.01 1 

Connecting cord,1000 mm, blue 07363.04 1 

Connecting cord,1000 mm, yellow 07363.02 1 



• 2 galvanically isolated analog inputs 

• online registration of oscillation 


•1 MHz time resolution for digital inputs 

• Limited 5 V voltage output for Light barrier 

(undestructible) 

13

Physics: Experiments Acoustics 

Exp.No. Experiment description 

P1336000 Measurement of frequency of tuning forks, detuning of tuning forks with Cobra3 BASIC-UNIT 

P1336100 Investigation of the natural oscillation of columns of air with Cobra3 BASIC-UNIT 

P1336200 Measurement of the speed of sound in air with Cobra3 BASIC-UNIT 

P1336300 Measurement of the speed of sound in diffent gases with Cobra3 BASIC-UNIT 

P1336400 Measurement of the speed in metal rods with Cobra3 BASIC-UNIT 

P1336500 Acoustical Doppler effect with Cobra3 BASIC-UNIT 

P1361500 Investigation of beats with Cobra3 BASIC-UNIT 

P1361900 Influence of damping on the spectrum of the characteristic oscillations of air columns with Cobra3 BASIC-UNIT 

P1362000 Characteristic oscillations in cavity resonators - Hemholtz's resonators with Cobra3 BASIC-UNIT 

P1362100 Tone analysis with Cobra3 BASIC-UNIT 

P1362200 Oscillations in metal plates with Cobra3 BASIC-UNIT 

P1362300 Speech analysis with Cobra3 BASIC-UNIT 

P1362800 Signal filtration - elimination of background noises with Cobra3 BASIC-UNIT 

P1362900 Determination of the speed of sound in air - travel time measurement between two microphones with Cobra3 BASIC-UNIT 

P1363000 Acoustic spacial orientation with Cobra3 BASIC-UNIT 

1) P2150515 Chladni figures with FG-Module with Cobra3 BASIC-UNIT 

1) P2150615 Velocity of sound using Kundt’s tube with FG-Module with Cobra3 BASIC-UNIT 

1) P2150715 Wavelength and frequencies, Quincke tube with FG-Module with Cobra3 BASIC-UNIT 

1) P2152115 Determination of ultrasonic velocity (sonar principle) with Cobra3 BASIC-UNIT 

1) P2152415 Ultrasonic Doppler effect with Cobra3 BASIC-UNIT 


Characteristic oscillations in cavity resonators – Helmholtz´s resonators – 

P1362000 Measurement of: Sound amplitude, eigenfrequency 

14 


• online frequency analysis (Fourieranalysis) 

• make your measurments audible 

(sound card necessary) 

It should be shown that cavity resonators are acoustic 

resonators with a characteristic frequency that is only 

a function of their geometry. Due to their high resonator 

quality, the normal ambient background noise is sufficient 

to excite an undamped harmonic oscillation, which can 

then be detected by a sound probe inside the resonator. 



Cobra3 Power supply 12151.99 1 

Data cable, RS232 14602.00 1 

Software Cobra3 Frequency analysis 14514.61 1 

Microphone with amplifier 03543.00 1 

Tripod "PASS" 02002.55 1 

Support rod, l = 50 cm 02032.00 1 


Physics: Experiments Acoustics 

Determination of the velocity of sound (sonar principle) 

P2152115 Measurement of: Sound amplitude, delay-time 

An ultrasonic transmitter emits sound pulses onto a 

reflector, from which recording of them by a receiver 

shows a time delay. The velocity of sound is calculated 

from the path length and transmission time of the sound 

pulses. 

1. Determine transmission times for different distances 

apart of the transmitter and the receiver. 

2. Plot a graph of the path lengths of the sound pulses 

against their transmission time. 

3. Determine the velocity of sound from the graph. 


Ultrasonic unit 13900.00 1 

Power supply f. ultrasonic unit 13900.99 1 

Ultrasonic transmitter on stem 13901.00 1 

Ultrasonic receiver on stem 13902.00 1 

Cobra 3 BASIC-UNIT 12150.00 1 

Power supply, 12 V 12151.99 1 

RS 232 data cable 14602.00 1 

Barrel base PASS 02006.55 3 

Screen metal, 30x30 cm 08062.00 1 

Measuring tape, l = 2 m 09936.00 1 

Meter scale, l = 1000 mm 03001.00 1 

Screened cable, BNC, l = 75 cm 07542.11 2 

Adapter, BNC-socket/4 mm plug pair 07542.27 2 

Measure Software Universal writer 14504.61 1 


Ultrasonic Doppler-Effect 

P2152415 Measurement of: Velocity, frequency, frequency shift 

If a source of sound is in motion relative to its medium 

of propagation, the frequency of the waves that are 

emitted is displaced due to the Doppler effect. 

The frequency changes are measured and analysed for 

different relative velocities of source and observer. 


Ultrasonic unit 13900.00 1 

Power supply f. ultrasonic unit, 5 VDC, 12 W 13900.99 1 

Ultrasonic transmitter on stem 13901.00 1 

Ultrasonic receiver on stem 13902.00 1 

Sound head 03524.00 1 

Car, motor driven 11061.00 1 

Attachment for car 11061.02 1 

Track, l = 900 mm 11606.00 1 


Power supply, 12 V- 12151.99 1 

RS232 data cable 14602.00 1 

Cobra3 Timer / Counter Software 14511.61 1 




• for analog inputs 500 kHz sampling rate 

provides great results 


• 4 MHz time resolution for digital inputs 

• limited 5 V voltage output for light barrier 

(undestructible) 

15

Physics: Experiments Thermodynamics 


P1349100 Specific heat capacity of water with Cobra3 BASIC-UNIT 

P1349200 Specific evaporation heat of water with Cobra3 BASIC-UNIT 

P1349300 Specific heat capacity of liquids with Cobra3 BASIC-UNIT 

P1349400 Specific heat capacity of solid bodies with Cobra3 BASIC-UNIT 

P1349500 Specific condensation heat of water with Cobra3 BASIC-UNIT 

P1349600 Specific melting heat of ice with Cobra3 BASIC-UNIT 

P1349700 Specific dissolution heat of salts with Cobra3 BASIC-UNIT 

P1349800 Specific combustion heat of spirit with Cobra3 BASIC-UNIT 

P1349900 Volume expansion of gases with Cobra3 BASIC-UNIT 

P1350000 Gay-Lussas Law with Cobra3 BASIC-UNIT (Software Pressure) 

P1350100 Amontons Law with Cobra3 BASIC-UNIT 

P1350200 Boyle's and Mariotte's Law with Cobra3 BASIC-UNIT (Software Pressure) 

P1364100 Gay-Lussac's law with Cobra3 BASIC-UNIT (Software Gas laws) 

P1364200 Charles' (Amontons') law - variant A with Cobra3 BASIC-UNIT 

P1364300 Charles' (Amontons') law - variant B with Cobra3 BASIC-UNIT 

P1364415 Boyle and Mariotte's law with Cobra3 BASIC-UNIT (Software Gas laws) 

1) P2320211 Heat capacity of gases with Cobra3 BASIC-UNIT 

1) P2330111 Heat capacity of metals with Cobra3 BASIC-UNIT 

1) P2350115 Stefan-Boltzmann’s law of radiation with Cobra3 BASIC-UNIT 

1) P2360415 Stirling engine with Cobra3 BASIC-UNIT 


Specific heat capacity of solid bodies 

P1349400 Measurement of: Temperature 

16 

A calorimeter is filled with water at room temperature. 

Metallic bodies are heated in a water bath and are put 

in the calorimeter, the temperature of the mixture is 

noted down. 





Software Cobra3 Temperature 14503.61 1 

Measuring module, NiCrNi,330C 12104.00 1 

Immersion probe NiCr-Ni,-50/1000C 13615.03 1 

H-base -PASS- 02009.55 1 

Support rod,stainl.steel, 600 mm 02037.00 2 

Bosshead 02043.00 2 

Universal clamp 37715.00 2 

Ring with Bosshead, d =10 cm 37701.01 1 

Wire gauze 160x160mm,ceramic cen. 33287.01 1 

Metal bodies, set of 3 04406.00 3 

Calorimeter vessel, 500 ml 04401.10 1 

Glass beaker,short,400 ml 36014.00 1 

Glass beaker,short, 600 ml 36015.00 1 

Agitator rod 04404.10 1 

Pipette, with rubber bulb 64701.00 1 


Physics: Experiments Thermodynamics 

Gay-Lussac´s Law (with Software Cobra3 Pressure) 

P1350000 Measurement of: Temperature, pressure 

The general gas-equation describes the relationship between 

pressure, volume and temperature of an enclosed gas volume. 

A gas syringe is used for heating a gas volume at constant 

pressure, which is tempered in a glass jacket with the help of 

a water bath. Contrary to the experiment "volume expansion 

of gases", the gas injector is sealed in this experiment with 

motor oil and the software "Pressure" is used for simultaneously 

measuring the pressure, temperature and volume (number of 

the measurement value). The pressure measurement serves 

for checking a constant pressure during the measurement and 

for calculating the quantity pV/T during evaluation. 





Software Cobra3, Pressure 14510.61 1 

Measuring module, pressure 12103.00 1 

Modulconverter Cobra3 12150.04 1 

Cobra3,sensor-10..120 o C 12120.00 1 

Gas syringe, 100 ml 02614.00 1 

Glass jacket 02615.00 1 

Magn.stirring bar 30 mm, cyl. 46299.02 1 

Heating apparatus 32246.93 1 

H-base -PASS- 02009.55 1 

Support rod, stainl.steel, 250mm 02031.00 2 



Universal clamp with joint 37716.00 1 


Stirling engine 

P2360415 Measurement of: Temperature, volume, pressure, time 

The Stirling engine is submitted to a load by means of 

an adjustable torque meter, or by a coupled generator. 

Rotation frequency and temperature changes of the 

Stirling engine are observed. Effective mechanical energy 

and power, as well as effective electrical power, are 

assessed as a function of rotation 

frequency. The amount of energy converted to work per 

cycle can be determined with the assistance of the pV 

diagram. The efficiency of the Stirling engine can be 

estimated. 


Stirling engine, transparent 04372.00 1 

Motor/generator unit 04372.01 1 

Torque meter 04372.02 1 

Chimney for stirling engine 04372.04 1 

Meter f. stirling engine, pVnT 04371.97 1 

Sensor unit pVn for stirl. eng. 04371.00 1 

Screened cable, BNC, l = 750 mm 07542.11 2 

Thermocouple NiCr-Ni, sheathed 13615.01 2 

Raw alcohol for burning, 1000 ml 31150.70 1 

Adapter, BNC-socket/4 mm plug pair 07542.27 2 


Power supply, 12 V- 12151.99 1 

RS232 data cable 14602.00 1 

Cobra3 Software Universal Writer 14504.61 1 


• very quick, easy and comfortable set-up with the 

Phywe Glass jacket system 


• 200 kHz sampling rate for 2 analog inputs simultaneously 

• with Software measure display und analysis of relations 

possible 

17

Physics: Experiments Electricity 


P1330300 Ohm's Law with Cobra3 BASIC-UNIT 

P1330400 Temperature dependence of the resistance of pure metals. with Cobra3 BASIC-UNIT 

P1330500 Characteristics of semi-conductor diodes with Cobra3 BASIC-UNIT 

P1330600 Collector current-collector voltage characteristic of an NPN-transistor with Cobra3 BASIC-UNIT 

P1330700 Second order conductors with Cobra3 BASIC-UNIT 

P1330800 Switch-on current of a incandescent bulb with Cobra3 BASIC-UNIT 

P1330900 Measurement of the work and power of an incandescent bulb with Cobra3 BASIC-UNIT 

P1331000 Switch-on behaviour of a capacitance with Cobra3 BASIC-UNIT 

P1331100 Switch-on behaviour of an inductivity with Cobra3 BASIC-UNIT 

P1331200 Induction impulse with Cobra3 BASIC-UNIT 

P1331300 Generation of an alternating current, rectification and filtration with Cobra3 BASIC-UNIT 

P1331400 Efficiency of motor and generator with Cobra3 BASIC-UNIT 

P1333000 Generation of an AC voltage, rectification and smoothing 

P1336600 Measurement of the rebound time of a switch with Cobra3 BASIC-UNIT 

P1336700 Current-voltage characteristic of a solar cell with Cobra3 BASIC-UNIT 

P1361100 Single-valued and multiple-valued Fourier spectra with Cobra3 BASIC-UNIT 

P1361200 Analysis of simple and composite sinusoidal signals with Cobra3 BASIC-UNIT 

P1361300 Spectral analysis of different signal forms - sinusoidal, rectangular, triangular signals with Cobra3 BASIC-UNIT 

P1361400 Spectral analysis of periodic spike pulses with Cobra3 BASIC-UNIT 

P1361600 Determination of the non-linear distortion factor from the Fourier spectrum of distorted sinusoidal oscillations with Cobra3 BASIC-UNIT 

P1361700 The Fourier spectrum of rectified, non-smoothed alternating currents with Cobra3 BASIC-UNIT 

P1361800 Investigation of the characteristic oscillations of air columns with Cobra3 BASIC-UNIT 

P1362400 Coupled electrical resonant circuits with Cobra3 BASIC-UNIT 

P1362500 Forced oscillations of a non-linear electrical series resonance circuit - chaotic oscillation with Cobra3 BASIC-UNIT 

P1362600 Analysis of Fourier series with Cobra3 BASIC-UNIT 

P1362700 High-pass, low-pass, bandpass with Cobra3 BASIC-UNIT 

P1363100 Switch rebound with Cobra3 BASIC-UNIT 

P1363200 Phase relationships in a series resonant circuit with Cobra3 BASIC-UNIT 

P1363300 Free damped oscillation with Cobra3 BASIC-UNIT 

P1382400 The diode as rectifier with Cobra3 BASIC-UNIT 

P1400200 The behavior of a coil on switching on - current and voltage over time with Cobra3 BASIC-UNIT 

P1401400 Filter networks - The band-pass with Cobra3 BASIC-UNIT 

P1402200 How a phototransistor functions with the Cobra3 BASIC-UNIT 

P1402600 The generation of square pulse voltages by the operational amplifier with the Cobra3 BASIC-UNIT 

1) 

P2410115 Ohm's Law with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2410615 Current balance / Force acting on a current-carrying conductor with Cobra3 BASIC-UNIT 

1) 

P2410915 Characteristic curves of semiconductors with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2411315 Second order conductors. Electrolysis with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2420215 Switch-on behaviour of a capacitor and inductivity with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2420415 Coulomb’s law with Cobra3 BASIC-UNIT 

1) 

P2430215 Magnetic field of single coils / Biot-Savart’s law with Cobra3 BASIC-UNIT 

1) 

P2430315 Magnetic field of paired coils in Helmholtz arrangement with Cobra3 BASIC-UNIT 

1) 

P2430711 Ferromagnetic hysteresis with Cobra 3 with Cobra3 BASIC-UNIT 

1) 

P2440215 Magnetic induction with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2440311 Inductance of solenoids with Cobra3 BASIC-UNIT 

1) 

P2440411 Coil in the AC circuit with Cobra3 BASIC-UNIT 

1) 

P2440515 Capacitor in the AC circuit with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2440611 RLC Circuit with Cobra3 BASIC-UNIT 

1) 

P2440915 High-pass and low-pass filters with FG-Module with Cobra3 BASIC-UNIT 

1) 

P2441211 Induction impulse with Cobra3 BASIC-UNIT 

1) 

detailed scientific description (only in english) 

Collector current-collector voltage characteristic of an NPN-transistor 

P1330600 Measurement of: Current, voltage 

18 

The objective of the experiment is to determine the variations 

of the collector current with the collector voltage for various 

values of the base current intensity. Knowledge of these 

dependencies is important for the comprehension of the voltage 

amplification, the operating point setting, and dimensioning of 

amplifier stages with transistors. In this experiment, the output 

characteristics of an NPN transistor of type BC377 are to be 

recorded. 





Software Cobra3 Universal recorder 14504.61 1 

Power supply 0-12V DC/6V,12V AC 13505.93 1 

Digital multimeter 07134.00 1 

Potentiometer 1 kOhm, 0.4W, G2 39103.04 1 

Plug-in board,4mm plugs 06033.00 1 

Transistor BC337, base left, G3 39127.20 1 

Carbon resistor 47 kOhm, 1W, G1 39104.38 1 



Inductance of solenoids 

P2440311 Measurement of: Current, voltage, periodic time 

A square wave voltage of low frequency is applied to 

oscillatory circuits comprising coils and capacitors to 

produce free, damped oscillations. The values of 

inductance are calculated from the natural frequencies 

measured, the capacitance being known. 



Power supply, 12 V 12151.99 2 

RS 232 data cable 14602.00 1 

Cobra3 Universal writer software 14504.61 1 

Cobra3 Function generator module 12111.00 1 

Induction coil, 300 turns, dia. 40 mm 11006.01 1 







Coil, 1200 turns 06515.01 1 

PEK capacitor /case 1/ 1nF/ 500 V 39105.10 1 

PEK capacitor /case 1/ 470 pF/500 V 39105.07 1 

Vernier caliper 03010.00 1 

Measuring tape, l = 2 m 09936.00 1 


Switch-on behaviour of a capacitance 

P133100 Measurement of: Current, voltage, resistance, charge and discharge time 

To measure the course of current strength and voltage 

in a capacitance in the instant of switching on. The 

capacitance is determined from the measurement curve. 






Connection box 06030.23 1 

On/off switch 06034.01 1 

Carbon resistor 5.6 kOhm, 1W, G1 39104.28 1 

Electr.capacitor 100microF/35V,G1 39105.25 1 

Connecting cord, 500 mm, red 07361.01 1 

Connecting cord, 500 mm, blue 07361.04 1 




• no oscilloscope necessary 

• 500 kHz sampling rate for one analog input 


• 200 kHz sampling rate for 2 analog inputs 

simultaneously 

19


Induction impulse 

P1331200 Measurement of: Pulse duration, voltage 

Coulomb’s law 

P2420415 Measurement of: Charge, force 

20 


• 200 kHz sampling rate for 2 analog inputs 

simultaneously 


• Due to constant amount of charge measurements 

easy reproducable (High voltage) 

A permanent magnet falls through a coil at different 

velocities. the induced voltage impulse is recorded. The 

objective is two show that the integral over the induction 

voltage is independent of the velocity, and thus is 

constant. The magnetic flux of the permanent magnet 

is to be calculated. 







Support rod, l = 600 mm 02037.00 1 




Glass tube,diam 12mm l 300 mm 45126.01 1 

Coil holder 06528.00 1 

Coil, 600 turns, short 06522.01 1 

Magnet, d 8mm, l 60mm 06317.00 1 




A small electrically charged ball is positioned at a certain 

distance in front of a second charged ball. The force 

between these balls is measured as a function of their 

charge and distance (Coulomb’s law). For the 

measurements a sensitive force sensor and an 

electrometer amplifier are used. 



Cobra3 Force/Tesla software 14515.61 1 

Measuring module Newton 12110.00 1 

Newton sensor 12110.01 1 

Insulating Bar for Force Sensor 12110.01 1 

Plug with socket and crosshole, 2 07206.01 1 

Conductor ball, d = 40 mm 06237.00 2 

Power supply, 12 V- 12151.99 1 

RS232 cable 14602.00 1 

High voltage supply unit, 0-10 kV 13670.93 1 

Electrometer Amplifier 13621.00 1 

Capacitor 10nF/ 250V, G1 39105.14 1 


Physics: Experiments Optics 


P1331500 Dependence of the luminous intensity on the distance with Cobra3 BASIC-UNIT 

1) P2230415 Determination of diffraction intensity due to multiple slits and grids with Cobra3 BASIC-UNIT 

1) P2240211 Photometric law of distance with Cobra3 BASIC-UNIT 

1) P2250315 Fresnel’s equations – Theory of reflection with Cobra3 BASIC-UNIT 

1) P2260511 LDA -Laser Doppler Anemometry with Cobra3 BASIC-UNIT 


LDA – Laser Doppler Anemometry 

P2260511 Measurement of: Time, voltage, frequency shift 

Small particles in a current pass through the LDA 

measuring volume and scatter the light whose frequency 

is shifted by the Doppler effect due to the particle 

movement. The frequency change of the scattered light 

is detected and converted into a particle or flow velocity. 

Measurement of the light-frequency change of individual 

light beams which are reflected by moving particles. 


Base plate with rubber feet 08700.00 1 

HeNe laser, 5 mW 08701.00 1 

Power supply and switch for 5 mW laser 08702.93 1 


Power supply, 12 V- 12151.99 1 

Data cable, RS232 14602.00 1 

Software Cobra3-Frequency Analyzer 14514.61 1 

Surface mirror, 30 x 30 mm 08711.01 2 

Magnetic base 08710.00 8 

Plate holder 08719.00 1 

Lens with mount, f = +100 mm 08021.01 1 



Iris diaphragm 08045.00 1 

Beam splitter, 50:50 08741.00 1 

Silicon photo-detector with int. amplifier 08735.00 1 

Control unit for photo-detectors 08735.99 1 

Prism holder with table 08725.00 1 

Pinhole diaphragm, 30 mm 08743.00 1 

+ sonstiges Experimentiermaterial 

Dependence of the luminous intensity on the distance 

P1331500 Measurement of: Luminous intensity, voltage 

The luminous intensity is a function of the distance of 

the light sensor from the light source. The law for point 

light sources on which this is based should be determined. 






Power supply 0-12V DC/6V,12V AC 13505.93 1 

Stand tube 02060.00 2 

Distributor 06024.00 1 

Barrel base -PASS- 02006.55 2 

Bench clamp -PASS- 02010.00 1 

Meter scale, demo. l=1000mm 03001.00 1 

Photo diode, G1 39119.01 1 

Carbon resistor 470 Ohm, 1W, G1 39104.15 1 

Filament lamp 6V/5A, E14 06158.00 1 

Lamp holder E 14,on stem 06175.00 1 




• online frequency analysis 

• magnetic components enable easy adjustment 

21

Physics: Experiments Physical Structure of Matter 

Exp.No. Experment description 

P1363400 Range of alpha particles in the air with Cobra3 BASIC-UNIT 

P1363500 Mean range of beta radiation in air with Cobra3 BASIC-UNIT 

P1363600 Absorption of electrons (or positrons) in thin layers of matter with Cobra3 BASIC-UNIT 

P1363700 The quantal flux of gamma radiation in air with Cobra3 BASIC-UNIT 

P1363800 Absorption of gamma quanta (or electrons) as a function of material density with Cobra3 BASIC-UNIT 

P1363900 Law of radioactive decay with Cobra3 BASIC-UNIT 

P1364000 Radioactive equilibrium with Cobra3 BASIC-UNIT 

1) P2520111 Half-live radioactive equilibrium with Cobra3 BASIC-UNIT 

1) P2520211 Law of radioactive decay with Cobra33 with Cobra3 BASIC-UNIT 

1) P2520311 Poisson`s distribution and Gaussian distribution of radio-active decay with Cobra3 BASIC-UNIT 

1) P2522111 Rutherford experiment with Cobra3 BASIC-UNIT 

1) P2522211 Fine structure of alpha-spectrum of 241Am with Cobra3 BASIC-UNIT 

1) P2522311 Study of the alpha-energies of 226Ra with Cobra3 BASIC-UNIT 

1) P2522411 Energy loss of alpha particles in gases with Cobra3 BASIC-UNIT 

1) P2524111 Law of distance and absorption of gamma or beta rays with Cobra3 BASIC-UNIT 

1) P2524211 Energy Dependence of the gamma-absorption Coefficient with Cobra3 BASIC-UNIT 

1) P2524411 Compton effect with Cobra3 BASIC-UNIT 

1) P2524511 Internal conversion in 137mBa with Cobra3 BASIC-UNIT 

1) P2524611 Photonuclear cross-section / Compton scattering cross-section with Cobra3 BASIC-UNIT 

1) P2524711 X-ray fluorescence and Moseley's law with Cobra3 BASIC-UNIT 

1) P2530111 Hall effect in p-germanium with Cobra3 BASIC-UNIT 

1) P2530211 Hall effect in n-germanium with Cobra3 BASIC-UNIT 

1) P2530411 Band gap of germanium with Cobra3 BASIC-UNIT 


Range of a -particles in the air 

P1363400 Measurement of: Radioactivity 

22 


• quick, easy and safe set-up with magnetic components 

The particle flux density of -particles having a specific 

energy emitted by an -radiation source has already 

decreased to zero at a slight distance from the source. 

There is a relatively sharply defined range for 

monoenergetic -radiation in air. 





Software Cobra3 Radioactivity 14506.61 1 

Counter tube module 12106.00 1 

Base plate for radioactivity 09200.00 1 

Counter tube holder on fix.magn. 09201.00 1 

Source holder on fixing magnet 09202.00 1 

Counter tube, type A, BNC 09025.11 1 

Screened cable, BNC, l 300 mm 07542.10 1 

Rule, plastic, 200 mm 09937.01 1 


Physics: Experiments Physical Structure of Matter 

Absorption of -quanta (or electrons) as a function of material density 

P1363800 Measurement of: Radioactivity 

The procedure and evaluation are shown here in an 

exemplary experiment for -quanta; however, they can 

also be performed in an analogous manner for electrons. 

In the latter case, the Sr-90 source rod from the 

radioactive sources set (09047.50) and the absorption 

plate set for b-radiation (09024.00) must be used. The 

-quanta emitted by a radioactive -source (Co-60) are 

absorbed in solid material. The attenuation of the quantum 

flux resulting from this is, on the one hand, a function 

of the distance covered or the layer thickness of a 

material layer that is located in the radiation field and, 

on the other hand, of the density of the material that is 

penetrated. The particle flux decreases exponentially 

with the layer thickness; the attenuation coefficient m 

increases proportionally to the density r of the absorption 

material. 





Software Cobra3 Radioactivity 14506.61 1 

Counter tube module 12106.00 1 

Base plate for radioactivity 09200.00 1 

Counter tube, type A, BNC 09025.11 1 

Radioactive sources, set 09047.50 1 

Absorption plates f. beta-rays 09024.00 1 

Absorption material, lead 09029.01 1 


Hall effect in p-germanium 

P2530111 Measurement of: Magnetic field, voltage, current, resistance, temperature 

The resistivity and Hall voltage of a rectangular germanium 

sample are measured as a function of temperature and 

magnetic field. The band spacing, the specific conductivity, 

the type of charge carrier and the mobility of the charge 

carriers are determined from the measurements. 


Hall effect module 11801.00 1 

Hall effect, p-Ge, carrier board 11805.01 1 

Coil, 600 turns 06514.01 2 

Iron core, U-shaped, laminated 06501.00 1 

Pole pieces, plane, 30x30x48 mm, 2 06489.00 1 

Hall probe, tangent., prot. cap 13610.02 1 

Power supply 0-12 V DC/6 V, 12 V AC 13505.93 1 


Support rod -PASS-, square, l = 250 mm 02025.55 1 

Right angle clamp -PASS- 02040.55 1 

Connecting cord, l = 500 mm, red 07361.01 2 

Connecting cord, l = 500 mm, blue 07361.04 1 

Connecting cord, l = 750 mm, black 07362.05 2 



The Hall module offers: 

• central power supply for the sample and the sample heater 

• sample heater with fully automatic temperature control system 

23

Determination of the content of fruit acid in juices and wine 

P1370940 Measurement of: Temperature, pH, conductivity 

24 

Chemistry: Experiments Food Chemistry 


P1318700 Automatic pH titration with a motor piston burette with Cobra3 BASIC-UNIT 

P1318800 Automatic pH titration with a light barrier with Cobra3 BASIC-UNIT 

P1318900 Manually operated pH-Titration with Cobra3 BASIC-UNIT 

P1329700 Analytical gas chromatography of butter and margarine with Cobra3 BASIC-UNIT 

P1370530 The manual titration of citric acid with Cobra3 BASIC-UNIT 

P1370540 The manual titration of citric acid with Cobra3 CHEM-UNIT 

P1370630 The automatic titration of ordinary vinegar with Cobra3 BASIC-UNIT 

P1370640 The automatic titration of ordinary vinegar with Cobra3 CHEM-UNIT 

P1370730 Determination of the phosporic acid content of a soft drink with Cobra3 BASIC-UNIT 

P1370740 Determination of the phosporic acid content of a soft drink with Cobra3 CHEM-UNIT 

P1370830 The pH and degree of acidity of coffee with Cobra3 BASIC-UNIT 

P1370840 The pH and degree of acidity of coffee with Cobra3 CHEM-UNIT 

P1370930 Determination of the content of fruit acid in juices and wine with Cobra3 BASIC-UNIT 

P1370940 Determination of the content of fruit acid in juices and wine with Cobra3 CHEM-UNIT 

P1371030 Titration curves of fresh milk and sour milk with Cobra3 BASIC-UNIT 

P1371040 Titration curves of fresh milk and sour milk with Cobra3 CHEM-UNIT 

P1371130 Changes in pH during the aging of milk (souring) with Cobra3 BASIC-UNIT 

P1371140 Changes in pH during the aging of milk (souring) with Cobra3 CHEM-UNIT 

P1371230 The buffering properties of foods with Cobra3 BASIC-UNIT 

P1371240 The buffering properties of foods with Cobra3 CHEM-UNIT 

P1371330 Determination of the calcium carbonate content of egg shell with Cobra3 BASIC-UNIT 

P1371340 Determination of the calcium carbonate content of egg shell with Cobra3 CHEM-UNIT 

P1371430 Determination of the common salt content of meat broth with Cobra3 BASIC-UNIT 

P1371440 Determination of the common salt content of meat broth with Cobra3 CHEM-UNIT 

P1371530 Chloride in mineral water with Cobra3 BASIC-UNIT 

P1371540 Chloride in mineral water with Cobra3 CHEM-UNIT 


• CHEM-UNIT: The entire chemistry in just one box! 

• The CHEM-UNIT can also control a motor piston burette 

• Titrations also manual or with drop counter possible 

Fruit juices and wine contain so-called fruit acids (malic 

acid, citric acid, tartaric acid etc.) and have pH's which 

lie between 2.7 and 3.8. The fruit acids content of juices 

and wine can be ascertained by a determination of their 

titratable total acid. 


Cobra3 CHEM-UNIT 12153.00 1 



Software Cobra3 CHEM-UNIT 14520.61 1 

pH-electrode, plastic, refillable, BNC 46266.15 1 

Immersion probe NiCr-Ni, teflon, 300 °C 13615.05 1 

Cable CHEM-UNIT/Motor piston burette 36501.01 1 

Motor piston burette, univeral, 50 ml 36499.93 1 

Magnetic stirrer Mini/MST 47334.93 1 

Magn.stirring bar 30mm, cyl. 46299.02 1 

Rubber stopper, d = 18/14mm, 1 hole 39254.01 1 

Volumetric pipette, 25 ml 36580.00 1 


Pipettor 36592.00 1 

Wash bottle, plastic, 500 ml 33931.00 1 

+ Chemicals and other laboratory material

Chemistry: Experiments Electrochemistry 


P1331800 Electrolysis of copper sulphate solutions with Cobra3 BASIC-UNIT 

P1331900 The electrochemical series of metals with Cobra3 BASIC-UNIT 

P1332000 Electric potential of a concentration element with Cobra3 BASIC-UNIT 

1) P3060111 Charge transport in solids with Cobra3 BASIC-UNIT 

1) P3060211 Charge transport in liquids with Cobra3 BASIC-UNIT 

1) P3060240 Charge transport in liquids mit der Cobra3 CHEM-UNIT 

1) P3060511 Temperature dependance of conductivity with Cobra3 BASIC-UNIT 

1) P3060540 Temperature dependance of conductivity mit der Cobra3 CHEM-UNIT 

1) P3060611 Conductivity of strong and weak electrolytes with Cobra3 BASIC-UNIT 

1) P3060640 Conductivity of strong and weak electrolytes with Cobra3 CHEM-UNIT 

1) P3060711 Conductivity titration with Cobra3 BASIC-UNIT 

1) P3060740 Conductivity titration mit der Cobra3 CHEM-UNIT 

1) P3061311 Potentiometric titration with Cobra3 BASIC-UNIT 

1) P3061340 Potentiometric titration mit der Cobra3 CHEM-UNIT 

1) P3061411 Precipitation titration with Cobra3 BASIC-UNIT 

1) P3061440 Precipitation titration mit der Cobra3 CHEM-UNIT 

1) P3061611 Titration curves and buffering capacity with Cobra3 BASIC-UNIT 

1) P3061640 Titration curves and buffering capacity mit der Cobra3 CHEM-UNIT 

1) P3061711 Potentiometric pH titration (Phosphoric acid in soft drinks) with Cobra3 BASIC-UNIT 

1) P3061740 Potentiometric pH titration (Phosphoric acid in soft drinks) mit der Cobra3 CHEM-UNIT 

1) P3061811 Electrode kinetics:The hydrogen overpotential of metals with Cobra3 BASIC-UNIT 


P3060540 Measurement of: Temperature, conductivity 

Materialliste Art.Nr. Menge 



Data cable, RS232 14602.00 1 


Conductivity probe 18151.02 1 

Immersion probe NiCr-Ni, Teflon, 300°C 13615.05 1 

Magnetic heating stirrer 35720.93 1 

Magnetic stirrer bar, l = 25 mm, oval 46300.01 1 

Electronic temperature control 35721.00 1 

Spring balance holder 03065.20 1 

Support rod, l = 750 mm, M10 thread 02023.20 1 

Support rod with hole, l = 100 mm 02036.01 1 

Right angle clamp 37697.00 2 


Condenser, Dimroth type GL 25/12 35815.15 1 

Cristallizing dish, 560 ml 46244.00 1 

Precision balance, LE623P 48852.93 1 

Funnel, glass, do = 55 mm 34457.00 1 

Wash bottle, 500 ml 33931.00 1 

Glass beaker, 250 ml, tall 36004.00 1 

Glass rod, l = 300 mm, d = 8 mm 40485.06 1 

+ Chemicals and other laboratory material 


• clearly arranged set-up 

• comfortable follow-up of the experimental process 

25


1) P3020311 Heat capacity of gases with Cobra3 BASIC-UNIT 

1) P3020411 Determination of the enthalpy of vaporisation of liquids with Cobra3 BASIC-UNIT 

1) P3020611 Determination of the mixing enthalpy of binary fluid mixtures with Cobra3 BASIC-UNIT 

1) P3020711 Determination of the hydration enthalpy of an electrolyte (solution enthalpy) with Cobra3 BASIC-UNIT 

1) P3020811 Determination of the enthalpy of neutralisation with Cobra3 BASIC-UNIT 

1) P3020911 Determination of the melting enthalpy of a pure substance with Cobra3 BASIC-UNIT 


26 

Chemistry: Experiments Thermochemistry/Calorimetry 

P3020411 Measurement of: Temperature, energy 


• accurate measurement of temperature and energy provides 

the determination of different enthalpies 

P3020811 Measurement of: Temperature, energy 




Data cable, RS232 14602.00 1 

Temperature measuring module Pt100 12102.00 1 


Temperature probe Pt100 11759.01 1 

Calorimeter, transparent 04402.00 1 

Evaporation vessel for calorimeter 04405.00 1 

Heating coil with sockets 04450.00 1 

Work and power meter 13715.93 1 

Universal power supply 13500.93 1 

Connection cable, l = 500 mm, black 07361.05 4 


Magnetic stirrer bar, l = 30 mm, oval 35680.04 1 

Separator for magnetic bars 35680.03 1 




Retort stand, h = 500 mm 37694.00 1 

Precision balance, LE623P 48852.93 1 

Stop watch, digital, 1/100 s 03071.01 1 




Power supply 12V/2 A 12151.99 1 

Temperature measuring module Pt100 12102.00 1 


Temperature probe Pt100 11759.01 1 

Calorimeter, transparent 04402.00 1 

Delivery pipette, 50 ml 04402.10 1 


Rubber bulb, double 39287.00 1 

Heating coil with sockets 04450.00 1 

Work and power meter 13715.93 1 

Universal power supply 13500.93 1 


Laboratory balance, 

with data output, 800/1600/3200 g 48803.93 1 


Chemistry: Experiments Chemical Kinetics 


1) P3031811 Electrode kinetics:The hydrogen overpotential of metals with Cobra3 BASIC-UNIT 

1) P3050811 Conductometric measurement of the saponification of esters with Cobra3 BASIC-UNIT 

1) P3050840 Conductometric measurement of the saponification of esters mit der Cobra3 CHEM-UNIT 

1) P3050911 Enzyme kinetics: determination of Michaelis-Menton constant with Cobra3 BASIC-UNIT 

1) P3050940 Enzyme kinetics: determination of Michaelis-Menton constant mit der Cobra3 CHEM-UNIT 

1) P3051011 Inhibition and poisoning of enzymes with Cobra3 BASIC-UNIT 

1) P3051040 Inhibition and poisoning of enzymes mit der Cobra3 CHEM-UNIT 


Electrode kinetics: The hydrogen overpotential of metals 

P3061811 Measurement of: Current, voltage 

Electrode polarization and the presence of overpotentials are 

important concepts in understanding electrode processes. 

They underlie the fact that galvanic cells always deliver current 

at less than the equilibrium e.m.f. and that an applied potential 

greater than the equilibrium e.m.f. is required in order to drive 

a reaction in an electrolytic cell. 

The current-potential curve for the electrolysis of a 1 M 

hydrochloric acid solution is recorded using graphite rod 

electrodes, and the decomposition voltage is determined. By 

replacing the graphite rod cathode with a series of different 

metal rod electrodes, the overpotentials for hydrogen evolution 

at these metals can be compared. 




Data cable, RS232 14602.00 1 

Software Cobra 3 Universal writer 14504.61 1 

Current probe 6A 12126.00 1 

Power supply, universal 13500.93 1 

Retort stand, h = 750 mm 37694.00 1 

Holder for 2 electrodes 45284.01 1 

Laboratory thermometer, –10... +50°C 38034.00 1 

Carbon electrodes, d = 7 mm, l = 150 mm 44512.00 1 

Copper electrode, d = 8 mm, l = 150 mm 45201.00 1 

Iron electrode, d = 8 mm, l = 150 mm 45204.00 1 

Nickel electrode, d = 8 mm, l = 150 mm 45205.00 1 

Zinc electrode, d = 8 mm, l = 150 mm 45288.01 1 


P3050840 Measurement of: Conductivity, time 




Data cable, RS232 14602.00 1 


Conductivity / temperature electrode 13701.01 1 


Electronic temperature control 35721.00 1 


Support rod with hole, l = 100 02036.01 1 

Spring balance holder 03065.20 1 



Condenser, Dimroth type GL 25/12 35815.15 1 

Glass tubes, straight, l = 80 mm 36701.65 1 


27

28 

Chemistry: Experiments Chemical Equilibrium 


P1311000 Gaschromatography with Cobra3 CHEM-UNIT 

P1332100 Chromatographic seperation processes: gas chromatography with Cobra3 BASIC-UNIT 

1) P3030911 Dissociation equilibrium with Cobra3 BASIC-UNIT 

1) P3030940 Dissociation equilibrium mit der Cobra3 CHEM-UNIT 

1) P3031311 Melting diagram of a binary mixture with Cobra3 BASIC-UNIT 

1) P3031340 Melting diagram of a binary mixture mit der Cobra3 CHEM-UNIT 

1) P3031640 Fractional distillation with the bubble tray column mit der Cobra3 CHEM-UNIT 

1) P3031711 Chromatographic separation procedures: gas chromatography with Cobra3 BASIC-UNIT 

1) P3031740 Chromatographic separation procedures: gas chromatography mit der Cobra3 CHEM-UNIT 


Complete experiment Gas chromatography 

P1311000 Measurement of: Temperature, time 


• easy and quick set-up 

• clearly arranged equipment 

• can be moved completely 

The glass jacket gas chromatograph can also be very 

easily set up on the panel for complete experiments. 

This didactic, transparent gas chromatograph can be 

used to carry out separations of highly volatile substances 

up to 100 °C. A butane mixture is suitable for this, for 

e.g. All the components of the open system such as the 

carrier gas supply, flow measurement, separating column 

with stationary phase, thermostat device, thermal 

conductivity conductor and recorder can be clearly 

identified, so that a graphic explanation of the principle 

of how it works is possible. 


Frame for complete experiments 45500.00 1 

Panel f. compl. experim. set-ups 45510.00 1 

Holder for glass jacket 45524.00 1 


Gas separation column 36670.00 1 

Soap bubble flow meter 36675.00 1 

Mesure probe f.GC, BNC contact 36670.10 1 

Contr. unit gas chromatograph 36670.99 1 

Syringe 1ml, Luer, 10 pcs 02593.03 1 


Surface probe NiCr-Ni 13615.04 1 

Stop clock,demo.;diam. 13 cm 03075.00 1 

Steel cylinder Helium, 2l, filled 41776.00 1 

Bath for thermostat, Makrolon 08487.02 1 

Immersion thermostat TC10 08492.93 1 

Gas bar 40466.00 2 

Precision Balance, Sartorius LE 623P 48852.93 1 

Retort stand, h 500 mm 37692.00 1 

Dish, plastic, 150x150x65 mm 33928.00 1 

Water jet pump, plastic 02728.00 1 


Chemistry: Experiments Gas laws 


P1349900 Volume expansion of gases with Cobra3 BASIC-UNIT 

P1350000 Gay-Lussas Law with Cobra3 BASIC-UNIT (Software Pressure) 

P1350100 Amontons Law with Cobra3 BASIC-UNIT 

P1350200 Boyle's and Mariotte's Law with Cobra3 BASIC-UNIT (Software Pressure) 

P1364100 Gay-Lussac's law with Cobra3 BASIC-UNIT (Software Gas laws) 

P1364200 Charles' (Amontons') law - variant A with Cobra3 BASIC-UNIT 

P1364300 Charles' (Amontons') law - variant B with Cobra3 BASIC-UNIT 

P1364415 Boyle and Mariotte's law with Cobra3 BASIC-UNIT (Software Gas laws) 

1) P3011111 Gay-Lussac's law with Cobra3 BASIC-UNIT 

1) P3011140 Gay-Lussac's law mit der Cobra3 CHEM-UNIT 

1) P3011211 Charles' (Amontons') law with Cobra3 BASIC-UNIT 

1) P3011311 Boyle and Mariotte's law with Cobra3 BASIC-UNIT 


Charles´ (Amontons´) law 

P1364300 Measurement of: Temperature, pressure, volume 

The general gas equation describes the relationship between 

pressure, volume and temperature of an enclosed volume of 

gas. A distillation insert serves to heat a volume of gas at 

constant volume, which is held at a constant temperature with 

the aid of a water bath in the glass jacket. 





Software Cobra3 - gas laws 14516.61 1 


Measuring module NiCrNi, 330C 12104.00 1 


Thermocouple NiCr-Ni,sheathed 13615.01 1 

Distillation insert for glass jacket 02615.06 1 



H-base -PASS- 02009.55 1 

Support rod,stainl.steel, 250mm 02031.00 2 


Boyle´s and Mariotte´s law 

P1364415 Measurement of: Pressure, temperature, volume 

The general gas equation describes the relationship 

between pressure, volume and temperature in an 

enclosed volume of gas. A gas syringe which has been 

sealed with motor oil is used to measure the connection 

between volume and pressure. The gas syringe is 

additionally held at a constant temperature with the aid 

of a water bath. This water bath prevents temperature 

oscillations in cases of compression and expansion and 

also enables the recording of isotherms at different 

temperatures. Pressure, temperature and volume are 

recorded point by point at the stroke of a key. 





Software Cobra3 - gas laws 14516.61 1 



Cobra3, sensor-10..120 °C 12120.00 1 

Gas syringe, 100 ml 02614.00 1 




29

Enzyme inhibition (poisoning of enzymes) 


30 

Chemistry: Experiments Biochemistry 


P1329600 Determination of the Michaelis´ contant with Cobra3 BASIC-UNIT 

P1369630 Determination of the isoelectric point of an amino acid (glycine) with Cobra3 BASIC-UNIT 

P1369640 Determination of the isoelectric point of an amino acid (glycine) with Cobra3 CHEM-UNIT 

P1369730 The ionic permeability of the cell membrane with Cobra3 BASIC-UNIT 

P1369740 The ionic permeability of the cell membrane with Cobra3 CHEM-UNIT 

P1369830 Determination of the Michaelis constant with Cobra3 BASIC-UNIT 

P1369840 Determination of the Michaelis constant with Cobra3 CHEM-UNIT 

P1369930 Substrate inhibition of enzymes with Cobra3 BASIC-UNIT 

P1369940 Substrate inhibition of enzymes with Cobra3 CHEM-UNIT 

P1370030 Enzyme inhibition (poisoning of enzymes with Cobra3 BASIC-UNIT 

P1370040 Enzyme inhibition (poisoning of enzymes with Cobra3 CHEM-UNIT 

1) P4120111 Determination of the isoelectric point of an amino acid (glycine) with Cobra3 BASIC-UNIT 

1) P4120140 Determination of the isoelectric point of an amino acid (glycine) (Interface 

1) P4120211 The ionic permeability of the cell membrane with Cobra3 BASIC-UNIT 

1) P4120240 The ionic permeability of the cell membrane mit der Cobra3 CHEM-UNIT 

1) P4120311 Determination of the Michaelis constant with Cobra3 BASIC-UNIT 

1) P4120340 Determination of the Michaelis constant mit der Cobra3 CHEM-UNIT 

1) P4120411 Substrate inhibition of enzymes with Cobra3 BASIC-UNIT 

1) P4120440 Substrate inhibition of enzymes mit der Cobra3 CHEM-UNIT 

1) P4120511 Enzyme inhibition (poisoning of enzymes) with Cobra3 BASIC-UNIT 

1) P4120540 Enzyme inhibition (poisoning of enzymes) mit der Cobra3 CHEM-UNIT 

1) P4120611 The enzymatic activity of catalase with Cobra3 BASIC-UNIT 


Determination of the isoelectric point of an amino acid (glycine) 

P1369640 Measurement of: pH, temperature, volume 

The enzymatic hydrolysis of urea in aqueous solution liberates 

carbon dioxide and ammonia. The ions of these compounds 

increase the conductivity of the solution. Conductivity 

measurements enable the rate of hydrolysis of urea by the 

enzyme urease to be determined. The addition of an appropriate 

inhibitor poisons the enzyme, so that it no longer converts 

substrate. 






Conductivity/temp. electrode 13701.01 1 

Magn.stirrer Mini/MST 47334.93 1 

Magn.stirring bar 30mm, cyl. 46299.02 1 

Balance SAS 51, 200g/0.01g, RS232 45990.93 1 


Amino acid molecules carry both acid and amino groups. 

They can therefore form both acidic anions and basic 

cations. The pH at which these two types of ions are 

both present in the same concentration is called the 

isoelectric point. This point is to be determined by 

recording the titration curve for the amino acid glycine. 






pH-electrode, plastic body, gel, BNC 46265.15 1 

Immers.probe NiCr-Ni,teflon,300C 13615.05 1 

Cable Chem-Unit/Motor piston burette 36501.01 1 

Motor.piston burette,univer.50ml 36499.93 1 

Magn.stirrer Mini/MST 47334.93 1 



Balance SAS 51, 200g/0.01g, RS232 45990.93 1 


Biology: Experiments Human Physiology 


P1332600 Cardiac and vasular sonic measurement (Phonocardiography) with Cobra3 BASIC-UNIT 

P1332700 Electrocardiography with Cobra3 BASIC-UNIT 

P1350300 Electromyography with Cobra3 BASIC-UNIT 

P1350400 Electro-oculography with Cobra3 BASIC-UNIT 

P1350500 Blood pressure measurement with Cobra3 BASIC-UNIT 

P1350600 Measurement of the respiratory rate with Cobra3 BASIC-UNIT 

P1350700 Changes in the blood flow during smoking with Cobra3 BASIC-UNIT 

P1350800 Regulation of body temperature with Cobra3 BASIC-UNIT 

P1360500 Muscle stretch reflex and determination of conducting velocity with Cobra3 BASIC-UNIT 

P1360600 Acoustic orientation in space with Cobra3 BASIC-UNIT 

P1360700 The enzymatic activity of catalase with Cobra3 BASIC-UNIT 

1) P4020111 Human electrocardiography (ECG) with Cobra3 BASIC-UNIT 

1) P4020211 Phonocardiography: Cardiac and vascular sonic measurement (PCG) with Cobra3 BASIC-UNIT 

1) P4020311 Blood pressure measurement with Cobra3 BASIC-UNIT 

1) P4020411 Changes in the blood flow during smoking with Cobra3 BASIC-UNIT 

1) P4020440 Changes in the blood flow during smoking mit der Cobra3 CHEM-UNIT 

1) P4030111 Electromyography (EMG) on the upper arm with Cobra3 BASIC-UNIT 

1) P4030211 Muscle stretch reflex & determination of conducting velocity with Cobra3 BASIC-UNIT 

1) P4040211 Hearing threshold & frequency differentiating threshold in humans with Cobra3 BASIC-UNIT 

1) P4040311 Acoustic orientation in space with Cobra3 BASIC-UNIT 

1) P4060311 Regulation of human body temperature with Cobra3 BASIC-UNIT 

1) P4060340 Regulation of human body temperature mit der Cobra3 CHEM-UNIT 

1) P4070511 Human electrooculography (EOG) with Cobra3 BASIC-UNIT 

1) P4090211 Measurement of the human respiratory rate with Cobra3 BASIC-UNIT 


Muscle stretch reflex and determination of conducting velocity 

P1360500 Measurement of: Voltage 

To trigger a stretch reflex in the lower leg musculature 

by tapping the Achilles tendon (Achilles tendon reflex). 

To record the compound action potential and determine 

the reflex latency and the conduction velocity. 






Biological amplifier 65961.93 1 

EMG electrodes, 3 pieces 65981.02 1 

Electrode commoning cable 65981.03 1 

Electrode cream, tube 65981.05 1 

Reflex hammer, triggering 65981.10 1 



Elektrocardiography (ECG) 

P1332700 Measurement of: Voltage, time 

The compound action potential of the excited cardiac muscle fibre is 

recorded by ECG electrodes on the body surface between the left leg 

and the right and left arm. The signal is filtered, amplified and passed 

to an interface for display on a screen and evaluation (lead II according 

to Einthoven). 







ECG electrodes, 3 off 65981.01 1 

Electrode commoning cable 65981.03 1 

Potassium chloride 250 g 30098.25 1 




31

Biology: Experiments Nervous Systems 


P1360000 Neuro-simulator (membrane time constant and low-pass filtering) with Cobra3 BASIC-UNIT 

P1360100 Neuro-simulator (how an exciting synapse functions) with Cobra3 BASIC-UNIT 

P1360200 Mechanical stimulation of the rear end of an earthworm with Cobra3 BASIC-UNIT 

P1360300 Mechanical stimulation of the front end of an earthworm with Cobra3 BASIC-UNIT 

P1360400 Electrical stimulation of an anaesthesized earthworm with Cobra3 BASIC-UNIT 

1) P4010111 Derivation of nerve & muscle potentials by mechanical stimulation at rear of an earthworm with Cobra3 BASIC-UNIT 

1) P4010211 Derivation of nerve and muscle potentials by mechnical stimulation: front end of earthworm with Cobra3 BASIC-UNIT 

1) P4010311 Derivation of nerve potentials after electrical stimulation of an anaesthetized earthworm with Cobra3 BASIC-UNIT 

1) P4010511 Neurosimulator: Membrane time constant and low-pass filtering with Cobra3 BASIC-UNIT 

1) P4010611 Neurosimulator: How an exiting synapse functions with Cobra3 BASIC-UNIT 


Electrical stimulation of an anaesthetized earthworm 



• The earthworm experiment chamber can be used for many 

neurophysiological experiments on an earthworm without 

harming it 

Neuronal oscillation 


32 


• With the combination of Neurosimulator and Cobra3 you can 

simulate many neurophysiological experiments 

To work on the following themes by measuring nerve 

and muscle potentials: 

1. The action of an anaesthetic 

2. The different conduction velocities of median and 

lateral giant fibres 

3. Refractory period of the median giant fibre 







Stimuli generator 65962.93 1 

Earthworm experiment chamber 65981.20 1 



Connecting cord, 250 mm, black 07360.05 2 




Many animal and human modes of behaviour exhibit 

rhythmic characteristics. The periodicity of such 

rhythmicity that is created in the central nervous system 

can extend over months, days, hours or seconds. The 

circuit example shows how non-oscillating individual 

neurons can be brought to oscillating behaviour in a 

group. 

In each case, neural oscillators are necessary as timing 

generator for such behaviour. 

The rhythmic behaviour of the neuronal network that is 

generated is based on the time-delayed negative feedback 

across a veto synapse. 

=> You can find detailed experiment desciptions in 

the Handbook Neurosimulator (01191.02) 






Neuro-simulator 65963.00 3 

Neuro-simulator, power supply 65963.93 1 

Connecting cord, 500 mm, yellow 07361.02 1 


Biology: Experiments Plant Physiology 


P1351200 Transpiration of leaves with Cobra3 BASIC-UNIT 

P1351300 Photosynthesis (measurement of oxygen pressure) with Cobra3 BASIC-UNIT 

P1351400 Glycolysis (measurement of temperature with Cobra3 BASIC-UNIT 

P1351500 Calorimetry of foods with Cobra3 BASIC-UNIT 

P1360800 Photosynthesis (bubble-counting method) with Cobra3 BASIC-UNIT 

P1360900 Glycolysis (measurement of pressure) with Cobra3 BASIC-UNIT 

1) P4110111 Photosynthesis (bubble counting method) with Cobra3 BASIC-UNIT 

1) P4110211 Photosynthesis (measurement of O2 pressure) with Cobra3 BASIC-UNIT 

1) P4110311 Transpiration of leaves with Cobra3 BASIC-UNIT 

1) P4110411 Glycolysis (measurement of pressure) with Cobra3 BASIC-UNIT 

1) P4110511 Glycolysis (measurement of temperature) with Cobra3 BASIC-UNIT 

1) P4110540 Glycolysis (measurement of temperature) mit der Cobra3 CHEM-UNIT 


Glykolysis (Measurement of temperature) 


Experimental objective is to depict the increase in 

temperature, which results, when yeast cells ferment 

sugar. To compare the temperature curves of the solutions 

with and without yeast. 






Temperature sensor, -10..120 °C 12120.00 2 

Precision thermometer, 0...100 °C, grad. 0.2° 47052.00 1 

Thermos flask 64841.00 2 

Rubber stopper, d = 41/34 mm, 2 holes 39261.02 2 

Beaker, low, BORO 3.3, 1000 ml 46057.00 1 


Photosynthesis (measurement of O2 pressure) 

P1351300 Measurement of: Pressure, time 

The intensity of photosynthesis, and so also of oxygen 

production, is dependent on the colour and intensity of 

the light. To demonstrate this dependence, the increase 

in oxygen pressure is measured during photosynthesis 

under white light and green light, and in the dark. With 

a waterweed shoot, the pressure increase under green 

light is only half as much as under white light. No pressure 

increase is measurable in the dark. 







Support clamp for small case 02043.10 1 

Support base variable 02001.00 1 

Support rod, l = 500 mm 02022.00 2 



Lab jack, 160 x 130 mm 02074.00 1 


33

Biology: Experiments Ecology and Environment 


P1332500 Daily course of luminosity with Cobra3 BASIC-UNIT 

P1350900 Comparison of the heat capacities of water and land with Cobra3 BASIC-UNIT 

P1351000 The Bergman rule: heat loss in dependence on body surface area and volume with Cobra3 BASIC-UNIT 

P1351100 The isolating effect of body coverage with Cobra3 BASIC-UNIT 

P1370130 The conductivity of various water samples with Cobra3 BASIC-UNIT 

P1370140 The conductivity of various water samples with Cobra3 CHEM-UNIT 

P1370230 The pH of various water samples with Cobra3 BASIC-UNIT 

P1370240 The pH of various water samples with Cobra3 CHEM-UNIT 

P1370330 The origin of acid rain with Cobra3 BASIC-UNIT 

P1370340 The origin of acid rain with Cobra3 CHEM-UNIT 

P1370430 The twenty-four hour rhythm of an aquatic plant with Cobra3 BASIC-UNIT 

P1370440 The twenty-four hour rhythm of an aquatic plant with Cobra3 CHEM-UNIT 

1) P4100111 Comparison of the heat capacities of water and land with Cobra3 BASIC-UNIT 

1) P4100140 Comparison of the heat capacities of water and land mit der Cobra3 CHEM-UNIT 

1) P4100211 The Bergmann rule: Heat loss in dependence on body surface area and volume with Cobra3 BASIC-UNIT 

1) P4100240 The Bergmann rule: Heat loss in dependence on body surface area and volume mit der Cobra3 CHEM-UNIT 

1) P4100311 The insulating effect of body coverage with Cobra3 BASIC-UNIT 

1) P4100340 The insulating effect of body coverage mit der Cobra3 CHEM-UNIT 

1) P4100411 The daily course of luminosity with Cobra3 BASIC-UNIT 

1) P4100440 The daily course of luminosity mit der Cobra3 CHEM-UNIT 

1) P4100511 The conductivity of various water samples with Cobra3 BASIC-UNIT 

1) P4100540 The conductivity of various water samples mit der Cobra3 CHEM-UNIT 

1) P4100611 The pH of various water samples with Cobra3 BASIC-UNIT 

1) P4100640 The pH of various water samples mit der Cobra3 CHEM-UNIT 

1) P4100711 The origin of acid rain with Cobra3 BASIC-UNIT 

1) P4100740 The origin of acid rain mit der Cobra3 CHEM-UNIT 

1) P4100840 The twenty-four hour rhythm of an aquatic plant mit der Cobra3 CHEM-UNIT 


The Bergmann rule: Heat loss in dependence on body surface area and volume 


The isolating effect of body coverage 


34 

Experimental objective is to prepare a graph which 

demonstrates the different heat losses with different 

volumes and body surface areas. This experiments 

confirms the Bergmann rule, which says that animals in 

colder regions are larger than their near relatives in 

warmer regions. The reason for this is that a larger animal 

suffers less heat loss than a smaller animal, as its body 

surface is smaller in comparison to its volume than it is 

for smaller animals. 




Temperature sensor, -10..120°C 12120.00 2 

Flask, round bottom, 100 ml, IGJ 19/26 35841.01 1 

Long-neck rd. bot.flask, 500 ml, PN 29 36348.00 1 


The experimental objective is to prepare curves showing 

the isolating effect of various body coverages 





Software Cobra§ Temperature 14503.61 1 

Temperature sensor -10..120 °C 12120.00 2 

Snap-cap vials, d = 28 mm, h = 75 mm, 10 p. 33622.03 1 

Precision thermometer, 0...100 °C, grad. 0.2 °47052.00 1 


Biology: Experiments Ecology and Environment 

The conductivity of various water samples 


Besides undissolved solids and particles, natural waters 

also contain dissolved substances. These are mostly 

dissolved salts, i.e. electrolytes. The conductivity of the 

course of rivers subject to waste water effluents, for 

example, is therefore regularly monitored. High 

conductivities can result from in-washes after heavy 

downpours or from eluvation because of the geography. 

Should this not be the case, they point to contamination 

by inorganic salts or, in flowing water, of the transport 

of salts from distant regions. In fresh-water lakes, the 

different mineral salt concentrations in various horizontal 

or vertical zones can be determined by conductivity 

measurements. In this experiment, the conductivity of 

various water samples are to be determined. 






Conductivity/temperature electrode 13701.01 1 

Wash bottle, plastic, 500 ml 33931.00 1 

Glass beaker, tall, 50 ml 36001.00 1 

Glass beaker, tall, 150 ml 36003.00 7 

Retort stand, 180 x 100mm, h = 750 mm 37690.00 1 



Standard solution 1.413 mS/cm (25 °C), 460 ml 47070.02 1 

Water, distilled, 5 l 31246.81 1 


The origin of acid rain 

P1370340 Measurement of: pH-value 

Acid rain, which is predominately caused by anthropogenic 

air pollution from power stations, households and traffic, 

is the cause of damage to forests and the acidification 

of soil and bodies of water. The immissions are mostly 

gaseous, but are also often in the form of aerosols, i.e. 

suspended solid or liquid particles in a very finely 

distributed form. They contain gases (e.g. sulphur dioxide, 

nitrogen dioxide, carbon dioxide etc.) and the acids 

derived from them (e.g. sulphurous acid, nitrous acid, 

nitric acid, carbonic acid etc.). In this experiment, acid 

rain is to be articially prepared by passing gases such 

as SO2, NO2 and CO2 through water, and the drop in pH 

resulting from the formation of acid then recorded. 






pH-electrode, plastic body, gel, BNC 46265.10 1 

Retort stand, 180 x 100 mm, h = 750 mm 37690.00 1 


Graduated pipette, 5 ml 36599.00 1 

Pasteur pipettes, 1 ml, PE, 500 pcs 36615.00 1 



• Cobra3 can replace a multimeter. Just change the 

measuring module or sensor and measure different 

measuring quantities 

35

Measuring quantities, Measuring modules and sensors 

Measurement of voltage/current 

Necessary Software module: 

Software Cobra3 Universal Writer (14515.61) or 

Software PowerGraph (14525.61) 

Voltages can be recorded easily with software assistance in a range of ± 0...30 V (BASIC-UNIT) or ± 0...80 V (CHEM-UNIT). The voltage 

can be measured in the ranges defined by the Cobra3 BASIC-/CHEM-UNIT. 

The current adapters for the Cobra3 BASIC-UNIT allow current intensity measurements of ± 0...6 A or ± 0...30 A. The measuring ranges 

of the current adapters are fixed. In addition, current intensities can be measured as a voltage drop using a parallel resistor. 

Cobra3 Current sensor, 6 A, galvanic separated 12126.00 

This sensor serves for galvanic separated measurements of direct and alternating currents of up to 6 A. The sensor 

is supplied complete with a 350 mm data cable which enables it to be connected to the appropriate SUB-D socket, 

either input S1 or input S2, of the Cobra3 BASIC-UNIT. The measurement current is fed in via the 4 mm pair of 

safety sockets of the sensor. 


Measuring range: 6 A (sensor port S1), 6 A, 0.6 A, Autorange (sensor port S2) 

Continuous current: max. 6 A 

Accuracy: 1.5% 

Resolution: 0.1% (of end value of measuring range) 

Limiting frequency: 20 kHz 

Continuity resistance: < 0.02 Ohm 

Dimensions of sensor: 97 x 42 x 25 (mm) 

Weight: approx. 0.12 kg 

Cobra3 Current sensor, 30 A, galvanic separated12127.00 

This sensor serves for galvanic separated measurements of direct and alternating currents of up to 30 A. The sensor is 

supplied complete with a 350 mm data cable which enables it to be connected to the appropriate SUB-D socket, either 

input S1 or input S2, of the Cobra3 BASIC-UNIT. The measurement current is fed in via the 4 mm pair of safety sockets 

of the sensor. 


Measuring range: 30 A (sensor port S1), 30 A, 3 A, Autorange (sensor port S2) 

Continuous current: max. 25 A 

Max current: 30 A for < 5 minute! 

Accuracy: 1.5% 

Resolution: 0.1% (of end value of measuring range) 

Limiting frequency: 20 kHz 

Continuity resistance: < 0.01 Ohm 

Dimensions of sensor: 97 x 42 x 25 (mm) 


36 

Measurement of motion 


Software Cobra3 Translation/Rotation (14512.61) 

The following kinds of motion can be measured with Cobra3: Linear motion – velocity – 

acceleration – oscillation of a pendulum – rotary motion – angles – angular velocity – 

angular acceleration. Motions can be recorded with the Movement sensor or with the Light 

barrier with Incremental wheel. 

Movement sensor 12004.10 

Low-friction incremental decor with a high resolution (512 steps/turn) to detect rotary movements and linear 

movements. Diameter of the string grooves 6 mm and 12 mm. 

Necessary adapter for connecting the BNC-cable with 4-mm plug: 

- Adapter BNC-socket / 4 mm plug pair 07542.27 

- Adapter BNC-socket / 4 mm plug 07542.20 

Recommended equipment for pendulum experiments: 

- Pendulum 12004.11 

Light barrier, compact with Incremental wheel 11207.20 

Universal fork-type light barrier to measure short and long shadowing periods. The Incremental wheel with a string 

groove which can be attached to the fork of the light barrier allows to measure paths by counting the ribs of the 

Incremental wheel. Areas of application: track experiments, free fall, pendulum experiments, leaf spring oscillations, 

drop counters, volumetric measurements concerning the gas laws.


Free Fall 


Software Cobra3 Timer/Counter (14511.61) 

The free fall experiment with a beam stopper and the compact light barrier is used to measure the uniformly accelerated motion in 

the earth's gravitational field. Other falling experiments can be performed with the help of the falling-sphere apparatus. 

Measurement of Forces 

Beam stopper 02504.00 

Black anodised aluminium with a rectangular space. Bore holes to attach additional masses in order to show that 

the acceleration of gravity does not depend on the mass of the falling body. 


Length: 21 cm 

Width: 5 cm. 

Falling sphere apparatur 02502.88 

Measurement instrument to determine falling time of falling bodies. 

- Determination of the acceleration of gravity of a falling sphere with a high level of accuracy. 

- The purely mechanical fixation of the sphere allows to avoid errors which might occur with electromagnetic fixing 

systems due to the residual magnetism inherent in these systems. 

The apparatus includes the following individual components: 

Release unit 02502.00 

Impact switch 02503.00 

Remark: The release unit and the impact switch are attached to a “PASS” stand support system using clamps. 

The fall path can thus be adjusted as desired. Suitable time measuring devices: Digital Counter 4 decades 

(13600.93), Digital Counter 6 decades (13603.93), Timer 4-4 (13605.99) or Cobra3 BASIC-UNIT (12150.00) 


Software Cobra3 Force/Tesla (14515.61) 

Newton measuring module 12110.00 

Plug-in module for measuring forces in conjunction with the Newton sensor (no. 12110.01). Especially suitable 

for experiments dealing with extremely small forces, e.g. surface tension experiments, Coulomb law, current 

balance etc. 

Measuring range: ± 4 mN, ± 40 mN, ± 400 mN, ± 4 N 

Resolution: 0.0035 mN, 0.035 mN, 0.35 mN, 3.5 mN 

Compensation: ± 4 N in every measuring range 

Newton Sensor ± 4 N 12110.01 

To be connected to the Newton module. Placed in a sturdy metal housing with a rod to be attached to support 

stands. Fitted with a hook to measure tensile forces and a detachable plate to induce compressive forces. 

- Overload protection through limit stops for tensile and compressive stress 

- Nearly "non-displacement" force measurement (stroke approx. 0.4 mm/N) 

- Measurement with the highest resolution level of 0.0035 mN and a pre-load of up to 4 N possible (compensation). 

Cobra3 Newton sensor ± 50 N 12125.00 

Force sensor with 4 strain gauges in full bridge circuit, with tare function, load hooks and fixing screw for assembly 

to stands. With 1.9 m fixed cable between sensor and probe. Including 350 mm data cable 2xSub-D, 9-pin type 

for Cobra3 sensors. 


Measuring range: ± 50/15/5/1/0,5 N, Autorange 

Resolution: 0.1% of upper limit of effective range 

Max. loading: 120 N 

Limiting frequency: 500 Hz 

Tare: possible in every measuring range, max. 50 N 

Dimensions [mm]: 70 x 50 x 15 

Weight (only sensor): 0,08 kg 

37


Measurement of electric charge 

Measurement of acoustic, 

cardiac and vascular sound 



Software Cobra3 PowerGraph (145245461) 

Electrometer amplifier 13621.00 

Versatile measuring amplifier for the determination of very small direct currents, for measurement of 

electric charges and for a quasi-static measurement of direct voltages. The electrometer amplifier can 

be adapted directly to the Cobra3 BASIC-UNIT or used separately as a low cost measuring 

amplifier. Addtionally power supply 11074.93 is required. 

Technical data 

Amplification: 1 

Input resistance: >10 13 

Input current: < 0.5 pA 

Inherent input capacitance: < 50 pF 

Input voltage: ± 10 V 

Measuring microphone 03542.00 

With an integrated amplifier and three selectable output modes: level, signal, TTL-level 

- Frequency range: 30 Hz...20 kHz, (15...30 Hz and 20...40 kHz) with a reduced reception 

- Continuously adjustable amplification 

- Amplifier with minimum current requirements 

- Powered by a battery or an external power supply unit 

- Automatic shut-down after about one hour of class if powered by a battery. Reactivation by means of 

a push-button 

- 25 cm sensor tube (d = 8 mm) ensuring an interference-free measurement of sound fields 

- Flexible shielded cable ( l = 2 m), BNC plug 

- Comes supplied with a threaded rod for secure fastening 

Also necessary: 

Flat cell battery, 9 V: 07496.10 or 

Power supply unit 7.5/9/12 V, 300 mA, 2 mm plug: 11078.93 

Adapter BNC socket/4 mm plug pair: 07542.27 

Measuring microphone with amplifier 03543.00 

- Microphone capsule with connecting cable ( l= 1.5 m) toward the amplifier 

- Frequency range: 50 Hz...20 kHz 

- Continuously adjustable amplification 

- Amplifier with minimum current requirements. 

- Powered by a 9 V battery 

Also necessary: 

Flat cell battery, 9 V 07496.10 


Software Cobra3 Timer/Counter (14511.61) or 

Software Cobra3 Frequency Analysis (14514.61) or 


Software Cobra3 PowerGraph (14525.61) 

In the area of acoustics the following items can be treated with Cobra3: Acoustic, frequency and level measurement, Fourier analysis, 

speed of sound, physiological experiments like cardiac and vascular sonic measurements 

38 

Output voltage: ± 10 V with a 12 V ~ supply voltage 

Output current: 5 mA, short-circuit-proof 

Output resistance: < 1 

Dimensions: approx. 65 x 113 x 35 mm 

Weight: approx. 150 g 

Acoustic probe 03544.00 

Highly sensitive miniature microphone for measuring cardiac and vascular sound and for determining 

the heartbeat rate. Electret microphone with FET amplifier. Including a 1.5 m cable with 9-pin Sub-D 

plug. Frequency range: 50 Hz...20 kHz


Measurement of temperature/ 

thermodynamics 


Software Cobra3 Temperature(14503.61) or 

Software Cobra3 Gas Laws (14516.61) or 

Software Cobra3 Pressure (14510.61) or 

Software Cobra3 pH/Potential (14509.61) or 

Software Cobra3 Conductivity (14508.61) or 

Software Cobra3 CHEM-UNIT (14520.61) 

Temperature measuring module Pt 100 12102.00 

Plug-in module for a high-resolution measurement of temperatures using Pt 100 sensors. 


- Measuring range: - 60…+ 350 °C 

- Resolution: 0.01° C 

- Two sensors can be connected simultaneously (multiplexing). Measurement of the temperature difference with 

a resolution of 0.01°C. 

Temperature probes Pt 100 

Measuring resistance Pt 100 in a stainless steel or Teflon protective tube, connecting cable with four insulated 

copper leads for measuring resistances by the four conductor method, 5 pin diode plug. 

11759.01 11759.02 11759.04 

Temperature range: –20…300 °C - 20…+ 300 °C -200…300°C 

Response time (in water): approx. 10 s approx. 10 s approx. 20 s 

Protective tube: Stainless steel Stainless steel Teflon 

Length of protective tube: 200 mm 100 mm 250 mm 

Diameter of protective tube: 5.2 mm / 3.2 mm at measuring tip 3.5 mm 7 mm/5 mm 

Length of lead: 150 cm 120 cm 150 cm 

Art.No. Description 

11759.01 Temperature probe, immersion type, Pt 100 

11759.02 Surface temperature probe PT100 

11759.04 Temperature probe, immersion type, Teflon, PT100, 

Temperature measuring module NiCr-Ni 12104.00 

Plug-in module for measuring temperatures by means of NiCr-Ni thermocouples in the range of -50... +330°C. 

Can be combined with the pressure measuring module, e.g. to record vapour-pressure diagrams or to compensate 

the influence of the temperature on the electric conductivity or the pH value in solutions together with the 

corresponding modules and sensors. 


Measuring range: - 50...+ 333 °C 

Resolution: 0.2°C 

Thermocouples NiCr-Ni, Standard plug Type K 

Different types of NiCr-Ni thermocouples with 2 pin standard flat plug Type K, free of thermal tension. Suitable 

for e.g. Digital Thermometer 07050.00, 07050.01, Hand-held measuring device Temperature 07140.00, Cobra3 

CHEM-UNIT 12153.00 and Cobra3 BASIC-UNIT 12150.00. 

13615.02 13615.01 13615.03 13615.04 13615.05 

Temperature range: – 50…+ 500 °C – 50…+1100 °C – 50…+ 1000 °C – 50…+ 1000 °C – 50…+ 300 °C 

Response time: approx. 2 s < 1 s approx. 5 s approx. 3 s approx. 10 s 

Dimensions of the probe 

Diameter: 1…2 mm 0.5 mm 3 mm 4 mm (plate ) 7 mm 

Length: - 100 mm 120 mm 120 mm 250 mm 

Length of lead: 150 cm 200 cm 100 cm 100 cm 150 cm 

Art.No. Descption Remarks: 

13615.02 Thermocouple NiCr-Ni,500 °C max. glass silk isolation, point welded measuring tip 

13615.01 Thermocouple NiCr-Ni,sheathed, - 50…+ 1100 °C Magnesium-oxide isolation, sheath of stainless 

steel, flexible, bending radius app. 1 mm 

13615.03 Immersion probe NiCr-Ni, - 50…+ 1000 °C for liquids and gases, in a protective tube, stainless 

steel 

13615.05 Immersion probe, NiCr-Ni, teflon, 300 °C for liquids and gases, in a protective tube, teflon 

13615.04 Surface probe NiCr-Ni, - 50…+ 1000 °C for measuring surface temperature, Thermocouple 

on small copper plate to a protective tube 

Temperature sensor, semiconductor type 12120.00 

To be connected directly to the sensor ports S1 and S2 of the Cobra3 BASIC-UNIT. No measuring module required. 


Sensor sheathing: stainless steel 

Diameter: 6 mm 

Sensor length: 200 mm 

Measuring range: - 20 °C...+ 110 °C 

Resolution: 0.5 °C at S1 / 0.2 °C at S2 

Total length incl. Cable: 1.5 m 

Connector: 9-pin-Sub-D 

39


40 

Measurement of pressure 

Measurement of illuminance/ 

light intensity 

Temperature probe, immersion type, Pt1000 (for CHEM-UNIT) 12123.00 

Temperature probes Pt1000, with 4 mm plugs (for CHEM-UNIT) 

For temperature measurement and automatic temperature compensation of pH- and conductivity measurements. 

13702.01 Temperature probe Pt1000, 4-mm plugs, 1 m cable 

07139.01 Temperature probe Pt1000, 4-mm plugs, 10 m cable 


Software Cobra3 Pressure (14510.61) 

Software Cobra3 Weather Station (14518.61) 

Pressure measuring module 

Plug-in module for measuring pressures or pressure differences. With hose connector and hose section for 

connecting the module to any type of peripheral equipment (the vacuum rubber tubing Art.No. 39288.00 is 

recommended for extension purposes). The measuring module replaces mercury manometers or crusher gauges 

normally used for studying the gas laws, for recording vapourpressure diagrams or for measuring the barometric pressure. 


Pressure sensor: integrated in the measuring module 

Measuring range: 0...2 bar 

Resolution: 0.5 mbar 

Overload capacity: up to 4 bar 

Response time: < 1 ms 

Suitable media: non-aggressive gases and liquids 

Pressure sensors, absolut or differential 

Absolute and differential pressure sensors for overpressure and vacuum systems. With hose connector and hose 

section for connecting the module to any type of peripheral equipment (the vacuum rubber tubing Art.No. 39288.00 

is recommended for extension purposes). Including data cable for Cobra3 sensors. 


12128.00 12129.00 12130.00 

Measuring range: 2.0 bar 2.0 bar 80 mbar 

Autorange: 0.6 und 2.0 bar 0.6 und 2.0 bar 80/8/2.4 mbar 

Max. pressure: 10 bar 10 bar 750 mbar 

Min. pressure 0.2 bar - - 

Accuracy: 1.5 % 1.5 % 5 % 

Resolution: 0.05 % 0.05 % 0.05 % 

Dimensions [mm]: 75 x 42 x 25 75 x 42 x 25 75 x 42 x 25 

12128.00 Cobra3 Pressure sensor, 2.0 bar absolut 

12129.00 Cobra3 Pressure sensor, 2.0 bar, differential 

12130.00 Cobra3 Pressure sensor, 80 mbar, differential 


Software Cobra3 Lux (14507.61) or Software Cobra3 Universal Writer (14504.61) 

Lux measuring module 12107.00 

Plug-in module for measuring the illuminance. Measuring range selectable with the aid of the software. 

Measuring Range Resolution 

300 Lx 0.15 Lx 

3 kLx 1.5 Lx 

30 kLx 15 Lx 

300 kLx 150 Lx 

Luxmeter probe, l = 2 m 12107.01 

Rod-type probe to be connected to the Lux measuring module Art.No. 12107.00, the hand-held measuring device 

luxmeter Art.No. 07137.00 or the Lux range multiplier Art.No. 11111.11. 

Photodiode, housing G1 39119.01 

Si-PIN photodiode with screen against stray light. Type BPW 24 


Operation as a photodiode: 

- Reverse voltage: < 50 V 

- Power: < 180 mW 

- Sensitivity: 45 nA / lx 

Operation as a photovoltaic cell: 

- Open-circuit voltage: app. 380 mV at 1 klx 

- Short-circuit current: app. 35 µA at 1 klx 

- Sensitivity: 45 nA / lx


Measurement of magnetic field 

Hall Effect 

Measurement of radioactivity/ 

nuclear physics 


Software Cobra3 Force/Tesla (14515.61) 

Tesla measuring module 12109.00 

Plug-in module for a precise measurement of magnetic DC and AC fields. 

- Measurements possible from 5 T to 1 T 

- Detection of the field direction (sign) in the case of DC fields 

- Software-controlled zero adjustment and compensation of interference fields up to ± 1 T 

- Readily calibrated, i.e. no calibration magnet necessary 

- Use of the Hall probes of the teslameter Art.No. 13610.93 


Measuring ranges: ± 10 mT, ± 100 mT, ± 1 T 

Max. resolution: 5 T (12 bit) 

Compensation: ± 1 T in all measuring ranges 

Hall probes, axial or tangential 

These Hall probes can be combined with the digital Teslameter (13610.93) or the measuring module Cobra3 

(12109.00) with Cobra3 BASIC-UNIT (12150.00). Due to the flat electrode particularly suitable for measuring in 

narrow air gaps and in long coils. With fitted connecting cable and diode plug. 

Art.No. Description 

13610.01 Hall probe, axial, l = 300 mm, tube diameter = 6 mm 

13610.02 Hall probe, tangential, dimensions = 75 x 5 x 1 mm 


Software Cobra3 Hall effect (14521.61) 

Hall effect module 11801.00 

The Hall effect module is a time-saving system due to an easy, quick and safe experiment set-up. The Hall module 

offers the following advantages: 

- central power supply to provide an adjustable constant current for the sample and for the integrated sample 

heater 

- digital display to show either the sample current or the sample temperature 

- sample heater with fully automatic temperature control system to avoid damage to the samples 

- electronic compensating circuit for Hall voltage offset compensation 

- RS232 interface to connect an interface for comfortable data capturing, display and evaluation using a PC 

- Three carrier boards with temperature sensors, each equipped with a p- and n-doped germanium crystal and a 

non-doped Ge-crystal. 


Dimensions: 160 x 105 x 25 mm 

Max.sample temperature: 175 °C (automatic temperature control) 

Max. sample current: ± 60 mA 

Mains voltage: 12 V-; 3.5 A 


Software Cobra3 Radioactivity (14506.61) 

Geiger-Müller counter tube module 12106.00 

Plug-in module for measuring radioactive radiation with the aid of a Geiger-Muller counter tube. The module also 

supplies the counter tube with the necessary supply voltage. 


Counter tube voltage: 500 V ± 5% 

Max. pulse frequency: 4 x10 5 pulses per minute 

41


42 

Measurement of pH/Potential 

Counter tube Type A and Type B 

Self deleting halogen pulse ionisation chamber counter tube with very thin mica window to investigate, -, - 

and -radiation. In iron-chromium cylindrical casing, with BNC output socket (over interior 10 M resistor). 

Protective cap for mica window. Counter tube B with a 50 cm long coaxial cable. 


Diameter of casing: 22 mm 

Detactable type of radiation: 

Deleting substance: halogen 

Covering density of the active surface: Mica Type A: 1.5...2.0 mg/cm2 

Mica Type B: 2.0...3.0 mg/cm2 

Working voltage: 500 V 

09005.00 Counter tube Type B, with fixed 50 cm long BNC cable 

09025.11 Counter tube Type A 


Software Cobra3 pH/Potential (14504.61) or 


Length of plateau: 200 V 

Plateau rising: 0.04%/V 

Dead time: ca. 100 µs 

Zero effect: 15 Impulse/minute 

Operating life: >1010 Impulse 

pH/Potential measuring module 12101.00 

Plug-in module for measuring pH values and potentials. 

Input jack: coaxial, DIN 19262 

Input impedance: 10 12 

pH measurement: 

Measuring range: 0…14 pH, (0.01 pH) 

Probe calibration: Software-controlled 

Temperature compensation: Software-controlled and manual or automatic with the aid of the 

temperature module NiCr-Ni (Art.No.12104.00) 

Potential measurement: Measuring range 0…±2 V (± 1 mV) 

pH electrodes with DIN connector 

18450.00 pH Electrode, plastic, gel-filled, epoxy resin immersion shaft, with electrolyte-gel filling. Not 

refillable. With 1 m cable and DIN plug, immersion depth 120 mm, pH range 0...14, temperature range 

0 to 60°C, membrane shape spherical 

18452.00 pH Electrode, glass, refillable, with 1 m cable and DIN plug, immersion depth 165 mm, pH 

range 0...12, membrane resistance 400 W , temperature range 0 to 100 °C, membrane shape 

cylindrical, membrane volume 5 ml upwards 

Silver chloride reference electrode 18475.00 

Immersion length 150 mm, temperature range 0...80 °C, measuring volume 20 ml upwards, 4 mm plug, refillable 

Platinum electrode in protective tube, d = 8 mm 45206.00 

Electrode with fixed connection socket (4 mm plug). This electrode can be inserted or held in rubber stopperholes 

with 7 mm diameter as well as in screwed connection caps. In combination with Silver chloride reference electrode 

(18475.00) suitable for measuring of electrochemical potentials. 

Motor piston burette, universal, 50 ml 36499.93 

For uniform proportioning and reproducible titration. Microprocessor-controlled, with remote control. This spacesaving 

piston burette can be used for all kinds of titration, proportioning and incremental proportioning. The piston 

burette is particularly easy to use due to the menu-assisted user interface and the display. The precise proportioning 

system with the precision glass cylinder made of DURAN® and the zero-backlash motor-spindle-drive ensure exact 

results when it comes to proportioning and titration. All parts getting into contact with the titration and proportioning 

solutions are made of chemical-resistant materials. 


Burette volume: 50 ml 

Glass cylinder: DURAN® with a transparent, brown protective jacket 

Display: LCD matrix (64 x128 pixels) with background lighting; adjustable contrast 

Volume indication: 5 places before and 2 places after the decimal point 

Display accuracy: 0.01 ml 

Proportioning accuracy: ±0.15%, related to the total volume according to DIN 12650, Part 5 

Power consumption: 18 VA 

Supply voltage: 230 V ~ 

Dimensions: Width: 135 mm 

Depth: 310 mm 

Height: 205 mm 

Remark: 

For connecting the motor piston burette to the Cobra3-Interface you need additionally: 

- Cable, BASIC-UNIT / Motor piston burette (36501.03); for connecting to the Cobra3 BASIC-UNIT 

- Cable, CHEM-UNIT / Motor piston burette (36501.01); for connecting to the Cobra3 CHEM-UNIT


Measurement of conductivity 

Measurement of oxygen 

content in water 

Cable, Cobra3 / Motor piston burette 

For connecting the motor piston burette (36499.93) to the Cobra3-Interface. 

36501.03 Cable, Cobra3 BASIC-UNIT to motor piston burette 

36501.01 Cable, Cobra3 CHEM-UNIT to motor piston burette 

Redox electrode, BNC (for Cobra3 CHEM-UNIT) 46267.10 

For measuring of electrochemical potentials, with nonbreakable plastic shaft (d = 8 mm). 

pH electrodes with BNC plug (for Cobra3 CHEM-UNIT) 

46265.15 pH electrode, plastic, gel-filled, 0…+ 80 °C, 1.5 bar, gel-filled with double reference lead, with 

BNC plug, 1 m cable, 120 x 12 mm 

46266.10 pH electrode, plastic, 0…+ 80 °C, 0.5 bar, refillable with double reference lead, with BNC plug, 

1 m cable, 120 x 12 mm 

46268.10 pH electrode, glass, -5…+ 100 °C, 0.5 bar, refillable, with BNC plug, 1 m cable, 120 x 12 mm. 

Special electrodes with 4-mm plugs (for Cobra3 CHEM-UNIT) 

For connecting pH electrodes 18475.00 and 18477.00 to measuring instruments with BNC sockets adapter 

07542.26 is required. 

18475.00 Silver chloride reference electrode Immersion length 150 mm, temperature range 0...+ 80 °C, 

measuring volume 20 ml upwards, 4 mm plug 

45206.00 Platinum electrode in protective tube, d = 8 mm 

18477.00 Antimony electrode together with a reference electrode, e.g. silver chloride 18475.00, 

for pH measurements in the range 2.0 to 9.5, 4 mm plug 


Software Cobra3 Conductivity (14508.61) or 

Software Cobra3 CHEM-UNIT (14520.61 

Conductivity measuring module 12108.00 

Plug-in module for measuring conductivity. 


Measuring ranges: 0... 0,2 mS/cm 

0... 2 mS/cm 

0... 20 mS/cm 

0... 200 mS/cm 

Measuring range selection: Software-controlled 

Measuring frequency: app. 4 kHz 

Temperature compensation: Software-controlled and manual or automatically with Measuring module 

temperature NiCr-Ni (12104.00) 

Cell constant: 0,85...1,15 cm -1 

Conductivity probe 18151.02 

Glass shaft l = 12 cm, platinum-plated platinum sheet electrodes, minimum immersion depth 15 mm, cell constant 

1.0 cm -1 ±10%, including a 1.5 m cable. 

Conductivity-temperature probe (for Cobra3 CHEM-UNIT) 13701.01 

Conductivity probe with integrated Pt1000 temperature probe, cell constant k = 1,0/cm -1 , minimum immersion 

depth 10 mm, 5 pin diode plug. 


Software Cobra3 Oxygen (14505.61) 

Oxygen measuring module 12105.00 

Plug-in module for oxygen measurements. Simultaneous measurement of the oxygen concentration and the 

temperature using the oxygen/temperature probe Art.No. 12105.01. If there is also a pressure measuring module 

or a conductivity measuring module these can be connected to a free sensor port for correcting the atmospheric 

pressure or the salt content. 


Measuring ranges 

O 2-concentration: 0…30 mg/l 

O 2-saturation: 0…200 % 

Temperature: 0…+ 50 °C 

Accuracy O 2 : 2% of the measured value 

Temperature compensation: automatic (0…+ 50 °C) 

Atmospheric pressure correction: manual or automatic 

using the pressure module 12103.00 

Salt content correction: manual or automatic using the 

conductivity module 12108.00 

Electrode calibration: in air-saturated water or in the air 

43


Measurement of 

meteorological data 

Oxygen/temperatur electrode 12105.01 

With an integrated Pt1000 temperature sensor. Comes supplied together with a service box including an electrolyte 

and a diaphragm cap (spare part). 


Software Cobra3 Weather station(14518.61) 

With the help of the Software Cobra3 Weather station you can record 4 important meteorological data at the same time. That is in 

detail: 1. Temperature 2. Air pressure 3. Relative humidity 4. Wind velocity 

Pressure measuring module 12103.00 

Plug-in module for measuring pressures or pressure differences. With hose connector and hose section for 

connecting the module to any type of peripheral equipment (the vacuum rubber tubing no. 39288.00 is recommended 

for extension purposes). The measuring module replaces mercury manometers or crusher gauges normally used 

for studying the gas laws, for recording vapourpressure diagrams or for measuring the barometric pressure. 


Pressure sensor: integrated in the measuring module 

Measuring range: 0...2 bar 

Resolution: 0.5 mbar 

Overload capacity: up to 4 bar 

Response time: < 1 ms 

Suitable media: non-aggressive gases and liquids 

44 

Quantitative measurements 

with the Stirling engine 

Cobra3 Humidity sensor 12121.00 

Humidity sensor for measuring the relative and absolute humidity and also the temperature with Cobra3 BASIC- 

UNIT. 


Measuring range: 5...95% rel. humidity ± 5% 

Response time: 15 s in moving air 

Temperature measureing range: 40... 85 °C 

Cobra3 Wind sensor 12124.00 

Wind sensor with large speed measurement range of 4 to 140 km/h for fitting to masts or support rods or poles. 

Can be screwed onto the tripod rod/pole (M6) or attached to any mast or jib using the fixing angle supplied. 


Operating temperature: 0…+ 70 °C 

Measuring range: 1 … 40 m/s resp. 4 … 140 km/h 

Max. switching capacity: 0.6 VA 


Dimensions [mm]: 112 x 162 x 140 



Software Cobra3 PowerGraph (14525. 

Stirling engine, transparent 04372.00 

Stirling motor mounted on a base plate. Large transparent flywheel. Both cylinder and displacement piston made 

of heat-proof glass. Connecting rod and crank of wear resistant plastic. Hardened, ball bearing mounted steel 

connecting rod. Displacement piston with 2 measuring connecting pieces for temperature measurements. 

To demonstrate the functionality of: 

– a hot air engine 

– a heat pump/cold machine 

– a solar motor 

To determine: 

– mechanical and electric power as a function of rotating speed 

– of operating temperatures and temperature differences 

For the recording and evaluation of: 

– pV diagrams (thermodynamic cycle processes) 


Base plate: 207 x 290 mm 

Flywheel diameter: 140 mm 

Hole in temperature measuring connection piece (for thermocouple NiCr-Ni, sheathed): 0.6 mm 

Motor power: approx. 1 W 

rotating speed without load: min. 800/min 

Volume: 32 cm 3 …44 cm 3 

Standard accessories: spirit burner, Allen wrench to mount flywheel.


Measurement of RLC circuits 

Industry sensor adapter 

Meter for Stirling engine, pVnT 04371.97 

To display temperature and number of revolutions per minute, and for the output of analogue voltages for Stirling 

motor pressure and volume. 


Revolutions per: 

Minute: 4 digit display 

Range: 0…1999 min–1 

Temperature: 4 digit display 

T1: measuring range: –10…+ 500 °C 

Resolution: 1 °C 

T2: measuring range: –10…+190°C 

Resolution: 0.2°C 

Sensor unit pVn 04371.00 

To measure pressure inside the Stirling motor with a sensitive, temperature compensated pressure sensor and 

to scan the crankshaft with an incremental transmitter. 


Pressure sensor (for operating voltage 5 V): 

Sensitivity: typically 

44x10 -6 V/hPa 

Linearity: 0.15 % 

Voltage at Po: typically 0 mV 

Pressure: analogue voltage value 

Range: 0…5 V 

approx. Po ±1000 hPa 

Volume: analogue voltage value 

Range: 0…5 V 

V min…V max 

Mains voltage: 230 V/50…60 Hz 

(display T1 can be switched over to difference measurement) 

Incremental transmitter: 

Resolution: 256 impulses/revolution 




Function generator measuring module (FG-Module) 12111.00 

Plug-in measurement module for generating sinusoidal, square-wave and triangular-wave signals, direct voltages 

and frequency- or voltage-ramps. The module can be used as a voltage or current source: 

- If it is used as a voltage source, the actual frequency and current can be displayed and measured during operation 

- If it is used as a current source, the actual frequency and voltage can be displayed and measured 

- In addition, up to 2 measurement quantities can be recorded and evaluated with the help of the Cobra3 BASIC-UNIT 


Frequency ranges 

Range 1: 200 Hz–20 kHz Range 2: 2 Hz–200 Hz 

Interval: 10 Hz Interval: 1 Hz 

Signal form: Sinusoidal, square-wave, triangular-wave signals, direct voltages and frequency- or voltageramps 

Voltage source Current source 

Amplitude: ±0 V...10 V Amplitude: 0 mA...100 mA 

Interval: 5 mV Interval: 5 mA 

Offset voltage: –10 V...10 V (adjustable) Offset current: –100 mA...±100 mA 




Industry sensor adapter 12132.00 

The sensor is used to adapt commercially available industrial sensors with 2-, 3- and 4-conductor technology to 

the Cobra3 interface system. All sensor signals are converted into the Cobra3-typical 0…10 V signal. 


Supply voltage output: 24 V DC/50 mA max. 

Signal input: 

2-conductor type 4-20 mA: Ri = 500 

3-conductor type 0-20 mA: Ri = 500 

4-conductor type 0-10 mA: Ri = 130 k 

Signal output (Cobra3): 0...10 V or 2...10 V DC 

Resolution: 5 mV (corresponds to 10 mA sensor signal) 

45


Neurophysiological Experiments 

Biological amplifier 65961.93 

With the aid of this biological amplifier a wide range of electrophysiological experiments can be carried out on 

human beings, insects and earthworms. The frequency range for the measurement can be preselected to match 

the different biological current sources as in ECG (electrocardiogram), EMG (electromyogram, muscle action 

potential), EEG (electroencephalogram, recording of the electrical activity of the brain), EOG (electro-oculogram, 

recording of eye movements, e.g. when reading), ENG (electronystagmogram). Furthermore electrophysiological 

nerve and muscle potentials of an earthworm can be measured. 


Input resistance: 10 M 

Input voltage : 10 µV...100 mV 

Amplification stages: x100 and x1000 

Frequency ranges of types of measurement: ECG: 0.5...75.0 Hz 

EEG, ENG, EOG: 1...25 Hz 

EMG, earthworm: 80 Hz...5 kHz 

Trigger input: R < 220 

Trigger output: 5 V (TTL) 

Neurosimulator, neuron unit 65963.00 

The neuron unit Neurosimulator simulates a generalised nerve cell with an apical dendrite and its synaptic contacts, 

a cell body (soma) and a nerve fibre (axon) with myelin sheathes and a Ranvier's ring. The dendrite comprises 

exciting, inhibiting, presynaptic and Hebb's synapses which are marked by the corresponding colours of the 

sockets. Here the axons end in presynaptic buttons. These are represented together with a part of the (afferent) 

fibre providing the signal. The connection between the (efferent) axon of a neuron unit which leads away or the 

stimulus output socket of the operating unit and a synapse is established by means of a white cable which is 

inserted into the desired synapse socket. The yellow sockets serve for the derivation of the state of excitement 

of the simulated neuron. They must be connected to suitable measuring instruments (e.g. Cobra3 BASIC-UNIT). 

The intracellular potential (simulation of an intracellular electrode) can be collected at the socket "l" and the signal 

of the axon (action potentials = AP) at "E". These last ones represent the signals which are passed on by the cell. 

The height of the intracellular potential l can be deduced from the luminous intensity of the light emitting diode 

at the point of the electrode. Furthermore, the action potentials can be made audible with the aid of the integrated 

acoustic monitor. This allows - similar to what is happening in a neurophysiological laboratory - a direct evaluation 

of the cell activity. The turning knob "S" serves for setting the "firing threshold" of the neuron. This threshold 

controls that part of the intracellular potential which is passed on by means of action potentials (the effect of 

alcohol or drugs 

Neurosimulator operating unit 65963.93 

The operating unit comprises the power supply of up to 4 neuron units, three touch simulators with a variable stimulating intensity 

and an optic sensor. The three touch simulators comprise a key button and a turning knob which serves for adjusting the intensity 

of stimulation (or the height of the provided signal). The signal is supplied as long as the stimulation key remains pressed. The 

lightsensitive photo sensor allows the simulation of a simple eye showing lightdark signal. 

Voltage output: + 9 V (for 4 Neurosimulator units maximum) 

Stimulus outputs: 0…7 V 




A large number of neurophysiological experiments with living objects can be realised with Cobra3. The Neurosimulator unit offers 

additionally a lot of possibilities to simulate neurophysiological experiments without living objects. 

46 

Measurement of masses 


Software Cobra3 Balance (14470.61) or 


Offset output: –7 V 

Operating voltage: 230 V, 50…60 Hz 

Measurement of masses 

The PHYWE software "Balance" and “CHEM-UNIT“ allow balances with serial interfaces (RS232) to be connected 

to a computer. The software transfers measurement values to the PC, displays them in a demonstrative manner 

during the measurement and saves them for archiving purposes. 

Software features: 

- Display of measurement values during the measurement in a digital, analog or graphic form (either separately 

or simultaneously) 

- Measurement value conversion during the measurement (online) 

- Saving of measurement values/measurement series 

- Numerous different ways of measurement value evaluation after the measurement 

- Printing of measurement values as graphs or tables 

- Comparison of several measurements 

- Export of measurement values into other Windows® programs 

- Manual input of series of measurement values 

- Calculation of values using a function generator 

- and many more 

Note concerning the "Cobra3 CHEM UNIT" software: 

If you use this software, you have to connect a Cobra3 CHEM-UNIT to the PC in addition to the balance in order 

to be able to transfer values from the balance to the PC.


Cobra3 Accessories 

Digital large-format display 07157.93 

Special four-digit large-format display for presenting the measurement data supplied by the Cobra3 COM-UNIT, 

the PHYWE handheld measuring instruments and Sartorius or Denver balances equipped with data interfaces. 

- 4-digit digital display with a digit height of 56 mm 

- Matrix display (15 x 14 pixels) for presenting the units 

- Serial interface (RS 232) for connecting a measuring instrument 

- Second connector for the simultaneous presentation of another measuring quantity 

- Threaded connectors for connecting support stands or a clamp (to attach the display to various experimental 

set-ups). 

- Fit for the future: The large-format display can be updated and adapted to other measuring instruments which 

are not available on the market yet. 

Also included: Power supply 12 V/1 A with plug, support rod with thread 

Necessary accessories: Data cable 2xSub-D, 9-pin type 14602.00, support clamp for small cases 02043.10 


- Display: 7 Segment LED 

- Display range (4-digit): 0...9999; (3.5-digit): ± 1999 

- Height of matrix display: 15 x 14 pixel 

- Dimensions of matrix display (mm): 60 x 65 

- Port: 9-polig Sub-D (RS232) 

- Screw thread: 2 x M6, 1 x M4 

- Support rod: d = 7/10 mm; l = 120 mm 

- Power supply: 230 V ~ /12 V, 1 A 

- Dimensions (mm): 40 x 110 x 340 

Power supply Cobra3 12151.99 

To ensure the power supply of a Cobra3 BASIC-UNIT, Cobra3 CHEM-UNIT, Cobra3 COM-UNIT, Cobra3 DISPLAY- 

UNIT and approximately 4 other UNITs. 


Voltage input: 100…240 V AC /0.5 A / 47…63 Hz 

Connection: female connector for non-heating apparatuses 

(one male connector for non-heating apparatuses is included) 

Voltage output: + 12 V / 2 A 

Connecting cable: low-voltage plug 

Converter USB - RS232 14602.10 

Active converter with a USB connector and a 9-pin Sub-D connector. This connector has to be connected to the 

female USB connector and provides a serial interface with a 9-pin SUB-D connector. It is used to connect a Cobra3 

BASIC UNIT, a Cobra3 CHEM UNIT and all other units equipped with serial interfaces to a PC lacking such an 

interface. Instead, the serial interface is connected to a USB interface of the PC through the converter. The 

Converter USB - RS232 comes supplied with a CD with drivers. Cable length: 1.8 m 

Data cable 2xSub-D, 9-pin type 14602.00 

Versatile connecting cable (plug/socket) for the following connection types: 

• connection of the BASIC-UNIT with the serial interface of a PC 

• connection of the CHEM-UNIT with the serial interface of a PC 

• connection of the COM-UNIT with the Cobra3 DISPLAY-UNIT 

• connection of the COM-UNIT with a Digital large-format display 

• connection of up to 4 Digital large-format displays among each other 

• connection of up to 2 Cobra3 DISPLAY-UNITs among each other 

• connection of Cobra3 sensor port with Cobra3 measuring module converter 

• etc. 

Cobra3 measuring module converter 12150.04 

To connect a Cobra3 measuring module to one of the sensor ports of the BASIC-UNIT. The converter is plugged 

onto the measuring module by means of the 25-pin female connector. The 9-pin male connector is connected 

to the sensor port using a data cable (Art.No. 14602.00). 

USB 2.0 4-Port HUB, with power pack 14612.00 

If your computer does not have sufficient USB ports for connecting several PHYCON Interfaces, you can connect 

a USB HUB to one of your USB ports. This then provides you with 4 USB ports (Fig. similar). 


• USB HUB with 4 USB ports 2.0 Type A 

• Including external power pack 

• Including USB A-B cable, 1.8 m long 

• Including CD with drivers 

Support clamp for small cases 02043.10 

The clamp can be screwed to the back of the Cobra3 BASIC-UNIT, CHEM-UNIT, COM-UNIT, DISPLAY-UNIT or 

Digital large-format display thus allowing to attach the UNITs to a support stand for presentation 

purposes. 

47

Cobra3 packages 

The Cobra3 Starter Set for Physics, Chemistry and Biology 12170.66 

The Starter Set consists of: 

Description Art.No. Quanity 




Softw. Cobra3 Universal recorder 14504.61 1 

Software Cobra3 Timer/Counter 14511.61 1 

Softw. Cobra3 translat./rotation 14512.61 1 




Wire resistor 0,2 Ohm, 2W, G1 39104.69 1 

Temperature sensor, -10..120°C 

Handbook Physics, Computerassisted 

12120.00 1 

experiments with Cobra3 

Handbook Chemistry/Biology, Computer- 

01310.02 1 

assisted experiments with Cobra3 01320.02 1 

This Cobra3 Starter Set can replace the 

following equipment: 

mechanical plotter (xy, 2yt) 

multimeter 

digital counter – Frequency- and event counting 

electronic stopwatch 

instrument for measuring paths, velocity and acceleration 

photometer (relative measurement) 

thermometer 

etc. 

Remark: additionally required material, e.g. Power supply, 

glassware, chemicals, support material etc. are not included in 

this package. 

48 

The following experiments can be 

realised with the Cobra3 Starter Set: 

Physics: 

Frequency of a spring pendulum P1330100 

Frequency of a thread pendulum P1330200 

Ohm's Law P1330300 

Temperature dependence of the resistance of pure metals P1330400 

Switch-on current of a incandescent bulb P1330800 

Measurement of the work and power of an incandescent bulb P1330900 

Induction impulse P1331200 

Free fall with a screen 

The path-time law for free fall with the 

P1336900 

falling sphere apparatus P1337000 

Uniform, linear, unaccelerated motion P1337100 

Pendulum oscillations-variable g pendulum 

The harmonic oscillation of helical springs - 

P1337700 

parallel and series connection of spring 

Dependence of the oscillation period of a leaf spring 

P1337800 

on the pendulum length & pendulum mass P1337900 

Specific heat capacity of water P1349100 

Specific evaporation heat of water P1349200 

Specific heat capacity of liquids P1349300 

Single-valued and multiple-valued Fourier spectra 

Spectral analysis of different signal forms - 

P1361100 

sinusoidal, rectangular, triangular signals 

Chemistry: 

P1361300 

Electrolysis of copper sulphate solutions P1331800 

The electrochemical series of metals P1331900 

Electric potential of a concentration element 

Biology: 

P1332000 

Daily course of luminosity P1332500 

Changes in the blood flow during smoking P1350700 

Glycolysis P1351400 

The isolating effect of body coverage P1351100 

Comparison of the heat capacities of water and land 

The Bergman rule: heat loss in dependence on 

P1350900 

body surface area and volume P1351000


The Cobra3 Physics Set 12171.66 

The Physics Set consists of: 

Description Art.No. Quanity 





Software Cobra3 Timer/Counter 14511.61 1 

Software Cobra3 translat./rotation 14512.61 1 


Software Cobra3 Fourieranalysis 14514.61 1 



Wire resistor 0,2 Ohm, 2W, G1 39104.69 1 


Beam stopper 02504.00 1 

Measuring microphone with amplifier 03543.00 1 

Handbook Physics, Computerassisted 

experiments with Cobra3 01310.02 1 

This Cobra3 Physics Set can replace the 


storage oscilloscope (up to 0,5 MHz) 

frequency analyser (Fourier analysis) 

mechanical plotters (xy, 2yt) 

multimeter 

digital counter – Frequency- and event counting 

electronic stopwatch 

instrument for measuring paths, velocity and acceleration 


thermometer etc 



this package. 


realised with the Cobra3 Physics Set: 

Mechanics 

Frequency of a spring pendulum P1330100 


Free fall with a screen P1336900 

Uniform, linear, unaccelerated motion P1337100 

Uniformly accelerated, linear motion, Newton`s 2nd law P1337300 


Pendulum oscillations-variable g pendulum P1337700 

The harmonic oscillation of helical springs - 

parallel and series connection of spring P1337800 

Dependence of the oscillation period of a leaf spring 

on the pendulum length & pendulum mass P1337900 

Acoustics 

Measurement of frequency of tuning forks, 

detuning of tuning forks P1336000 

Investigation of the natural oscillation of columns of air P1336100 

Measurement of the speed of sound in air P1336200 

Measurement of the speed of sound in diffent gases P1336300 

Measurement of the speed in metal rods P1336400 

Thermodynamics 

Specific heat capacity of water P1349100 

Specific evaporation heat of water P1349200 

Specific heat capacity of liquids P1349300 

Specific heat capacity of solid bodies P1349400 

Specific condensation heat of water P1349500 

Specific melting heat of ice P1349600 

Specific dissolution heat of salts P1349700 

Electricity 

Ohm's Law P1330300 

Temperature dependence of the resistance of pure metals. P1330400 

Characteristics of semi-conductor diodes P1330500 

Collector current-collector voltage characteristic of an NPN-trans. P1330600 

Second order conductors P1330700 

Switch-on current of a incandescent bulb P1330800 

Measurement of the work and power of an incandescent bulb P1330900 

Switch-on behaviour of a capacitance P1331000 

Induction impulse P1331200 

Generation of an alternating current, rectification and filtration P1331300 

Dependence of the luminous intensity on the distance P1331500 

Current-voltage characteristic of a solar cell P1336700 

Single-valued and multiple-valued Fourier spectra P1361100 

Spectral analysis of different signal forms - 

sinusoidal, rectangular, triangular signals P1361300 

Analysis of Fourier series P1362600 

High-pass, low-pass, bandpass filters P1362700 

Switch rebound P1363100 

Phase relationships in a series resonant circuit P1363200 

Free damped oscillation P1363300 

49


Chemistry Set Chemistry Set 

Cobra3 CHEM-UNIT 12174.66 Cobra3 BASIC-UNIT 12172.66 

The Chemistry Sets consist of: 

CHEM-UNIT Set (12174.66) 

BASIC-UNIT-Set (12172.66) 

Description Art.No. Quantity 



Power supply 12V/2A 12151.99 1 1 

Data cable, plug/socket, 9 pole 14602.00 1 1 





Software Cobra3 pH and potential 14509.61 1 


Measuring module pH/potential 12101.00 1 

pH-electrode, polythene sheathed 18450.00 1 

pH-electrode, plastic, refill, BNC 46266.15 1 

Protection sleeve for pH electrode 37651.15 2 

Measuring module Temp., NiCr-Ni, 330 °C 12104.00 1 

Immersion probe NiCr-Ni, teflon, 300 °C 13615.05 1 1 

Conductivity/temperature electrode 13701.01 1 

Wire resistor, 0,2 Ohm, 2W, G1 39104.69 1 

Handbook Chemistry/Biology, Computerassisted 

experiments with Cobra3 01320.02 1 1 

This Cobra3 Chemistry Sets can replace 

the following equipment: 

50 

mechanical plotters (xy, 2yt) 

multimeter 

barometer 

manometer 

pH-meter 

conductivity measuring device 

thermometer 

etc. 


realised with the Cobra3 Chemistry Sets: 

Food chemistry 

The manual titration of citric acid 

Changes in pH during the aging of milk (souring) 

The buffering properties of foods 

Calorimetry of foods 

Ecology and environment 

The conductivity of various water samples 

The pH of various water samples 

The origin of acid rain 

Biochemistry 

Substrate inhibition of enzymes 


Electrolysis 

Electrolysis of copper sulphate solutions 

The electrochemical series of metals 

Electric potential of a concentration element 

Gas laws 

Gay-Lusac´s law 

Amonton´s law 

Boyle's and Mariotte's law 

1) only with Cobra3 BASIC-UNIT 

1) only with Cobra3 CHEM-UNIT 

1) with Cobra3 BASIC- or CHEM-UNIT 

3) P13705-30/40 

3) P13711-30/40 

3) P13712-30/40 

1) P1351500 

2) P1370140 

3) P13702-30/40 

3) P13703-30/40 

3) P13699-30/40 

3) P13700-30/40 

1) P1331800 

1) P1331900 

1) P1332000 

1) P1350000 

1) P1350100 

1) P1350200 



this package.


The Cobra3 Biology Set 12173.66 

The Biology Set consists of: 

Description Art.No. Quantity 







Software Cobra3 pH and potential 14509.61 1 


Measuring module pH/potential 12101.00 1 

pH-electrode, polythene sheathed 18450.00 1 



Acoustic probe for Cobra3 03544.00 1 

Handbook Chemistry/Biology, Computerassisted 

experiments with Cobra3 01320.02 1 

This Cobra3 Starter Set can replace the 


mechanical plotter (xy, 2yt) 

multimeter 

barometer 

pH-meter 

thermometer 


etc. 



this package. 


realised with the Cobra3 Biology Set: 

Food chemistry 

The manual titration of citric acid P1370530 

Changes in pH during the aging of milk (souring) P1371130 

The buffering properties of foods 

Ecology and environment 

P1371230 

The pH of various water samples P1370230 

The origin of acid rain P1370330 

The twenty-four hour rhythm of an aquatic plant P1370430 

Comparison of the heat capacities of water and land 

The Bergman rule: heat loss in dependence 

P1350900 

on body surface area and volume P1351000 

The isolating effect of body coverage P1351100 

Daily course of luminosity 

Biochemisty 

P1332500 

The ionic permeability of the cell membrane P1369730 

Substrate inhibition of enzymes P1369930 


Human physiology 

Cardiac and vasular 

P1370030 

sonic measurement (Phonocardiography) P1332600 

The enzymatic activity of catalase P1360700 

Blood pressure measurement P1350500 

Regulation of body temperature 

Plant physiology 

P1350800 

Photosynthesis (measurement of oxygen pressure) P1351300 

Transpiration of leaves P1351200 

Glycolysis (measurement of pressure) P1360900 

Glycolysis (measurement of temperature P1351400 

Calorimetry of foods P1351500 

51

Phywe measuring devices with PC interface! 

This overview shows you all PHYWE units equipped with a direct PC interface. You can control these units with the help of our "measure" 

software and a PC without the Cobra3 interface system. You can also evaluate the measurements in the usual way in the "measure" 

software. Please do not hesitate to contact us if you need further information concerning the units! 

Ultrasonic in air X-Ray Unit 35 kV 

Ultrasonic Unit 13900.00 

Goniometer Operation Unit 13903.99 

Software Goniometer 14523.61 

Demo multimeter p, pH, T, U, I, R, f Work and power meter 

Demo multimeter, RS232 13721.93 

Software for Demo multimeter 14409.61 

Temperature meter digital, 4-2 Digital pH-meter 

Temperature meter, digital 13617.93 

Software for temperature meter, digital 14405.61 

52 

Two LED-Displays 

Quick change x-ray 

tube technology: 

3 different tubes 

can be used 

Visible x-ray tube 

Integrated storage box 

Operating panel 

eingebautes 

Ratemeter 

Fluorescent screen 

RS232-interface 

for PC-control 

Built-in goniometer 

X-Ray Unit 35 kV 09058.99 

Software for X-Ray Unit 35 kV 14407.61 

Work and power meter 13715.93 

Software for Work and power meter 14403.61 

Digital pH-meter 13702.93 

Software for Digital pH-meter 14408.61

Phywe measuring devices with PC interface! 

Digital conductivity meter Franck-Hertz-Experiment 

Digital conductivity meter 13701.93 

Software for Digital conductivity meter 14400.61 

Multi-Channel-Analyzer 

Multi-Channel-Analyzer 13726.99 

Software for Multi-Channel-Analyzer 14424.61 

GREAT ADVANTAGE! 

Update possible!!! 

Balances with RS232 interface Electric field meter 

Balances with RS232 interface (Sartorius, Denver, Scaltec) 

Software Balance 14470.61 

Franck-Hertz control unit 09105.93 

Software for Franck-Hertz experiment 14522.61 

Both the firmware of many Phywe devices 

and the measuring software „measure“ 

can be easily updated under: 

www.phywe.com 

Electric field meter 11500.10 

Software for Electric field meter 14406.61 

Phywe hand-held measuring devices (with Datalogger) for environmental experiments 

Oxygen Pressure LUX Conductivity pHTemperature 

07135.00 Oxygenmeter, hand-held, RS232, Datalogger 

07136.00 Barometer/Manometer, hand-held, RS232, Datalogger 

07137.00 Lux meter, hand-held, RS232, Datalogger 

07138.00 Conductivity meter, hand-held, RS232, Datalogger 

07139.00 pH-potential meter, hand-held, RS232, Datalogger 

07140.00 Temperature meter 2 x NiCr-Ni, hand-held, RS232, Datalogger 

14420.61 Software Oxygenmeter, hand-held 

14419.61 Software Barometer/Manometer, hand-held 

14418.61 Software Lux meter, hand-held 

14417.61 Software Conductivity meter, hand-held 

14416.61 Software pH-/potential meter, hand-held 

14415.61 Software Temperature meter 2 x NiCr-Ni, hand-held

Overview 

*you can alternatively use Software PowerGraph (14525.61) 

Measuring quantity Measurement probes Page measurement module Software modul measure Unit Sample Experiments in Handbook Cobra3 

Voltage without 36 without Universal recorder Ohm´s law (P1330300) 

Current (Shunt) Shunt resistor (e.g. 39104.69) (14504.61) 

Current Current probe 6 A (12126.00) 36 without Universal recorder Heat capacity of gases (P2320211) 

Current probe 30 A (12127.00) (14504.61) 

Current, Voltage, 45 Function generator PowerGraph (14525.61) RLC Circuit (P2440611) 

Frequency (12111.00) Universal recorder (14504.61) Inductance of solenoids (P2440311) 

Voltage (0-10 V) Standard industry sensors (24 V-) 45 Industry sensor PowerGraph (14525.61) 

Current (0-20 mA) 

Current (4-20 mA) 

adapter (12132.00) 

Time/distance/angle Light barrier with counter (11207.30) 36 without Timer/Counter Frequency of a thread pendulum (P1330200) 

Light barrier, compact (11207.20) (14511.61) 

Translation/Rotation* Force-free, linear motion 

(14512.61) (P1337200) 

Path-time law Falling sphere apparatus (02502.88) 37 without Timer/Counter The path-time law for free fall with the 

(14511.61) falling sphere apparatus (P1337000) 

Distance/angle Movement sensor with cable (12004.10) 36 without Translation/Rotation* Uniform, linear, unaccelerated 

(14512.61) motion (P1337100) 

Force Newton sensor ± 50 N (12125.00) 37 without Force/Tesla* 

(14515.61) 

Force Newton sensor (12110.02) 37 Newton Force/Tesla* Coulomb´s law (P2420415) 

(12110.00) (14515.61) 

Pressure without 40 Pressure Pressure* Gay-Lussac´s law (P1350000) 

(12103.00) (14510.61) 

Gas laws* 

(14516.61) 

Amonton´s law (P1350100) 

Pressure Pressure sensor, 2 bar abs. (12128.00) 40 without Pressure* 

Pressure sensor, 2 bar diff. (12129.00) 

Pressure sensor, 80 mbar diff. (12130.00) 

(14510.61) 

Magn. flux density Hall probe, axial (13610.01) 41 Tesla Force/Tesla* Hall-Effect in p-Germanium (P2530115) 

Hall probe, tangential (13610.02) (12109.00) (14515.61) 

Radiation Counter tube, Typ A (09025.11) 41 GM Counter tube Radioactivity* Range of alpha particles in the air 

Counter tube, Typ B (09005.00) (12106.00) (14506.61) (P1363400) 

Frequency, level, Measuring microfon (03542.00) 38 without Fourieranalysis Investigations of beats (P1361500) 

spectrum Microfon with amplifier (03543.00) (14514.61) 

Timer/Counter Measurement of frequency of tuning forks, 

(14511.61) detuning of tuning forks (P1336000) 

Temperature Temperature sensor, -10...120 °C (12120.00) 39 without Temperature* The isolating effect of body coverage 

(14503.61) (P1351100) 

Temperature Temp.probe, immersion type, Pt100 (11759.01) 39 Temperature Pt100 Temperature* 

Surface temperature probe, Pt100 (11759.02) 

Temperature probe, imm., teflon (11759.04) 

(12102.00) (14503.61) 

Temperature Immersion probe NiCr-Ni, -50...1000°C (13615.03) 39 Temperature NiCr-Ni Temperature* Specific heat capacity of liquids 

Thermocouple NiCr-Ni, sheathed (13615.01) (12104.00) (14503.61) (P1349300) 

Thermocouple NiCr-Ni, 500°C max. (13615.02) 

Surface probe NiCr-Ni (13615.04) 

Immers.probe NiCr-Ni, teflon, 300°C (13615.05) 

Volume expansion of gases (P1349900) 

Wind speed Cup anemometer (12124.00) 44 without Weather station 

(14518.61) 

Humidity, temperature Humidity sensor (12121.00) 44 without PowerGraph (14525.61) 

Lux Luxmeter probe (12107.01) 40 Lux Lux* Photosynthesis (bubble-counting method) 

(12107.00) (14507.61) (P1360800) 

pH and Potential pH-electrode, polythene sheathed (18450.00) 42 pH/Potential pH/Potential* The automatic titration of ordinary vinegar (P1370600) 

pH-electrode, shock resistant (18452.00) (12101.00) (14509.61) The pH and degree of acidity of coffee (P1370830) 

Conductivity Conductivity probe (18151.02) 43 Conductivity Conductivity* Determination of the Michaelis constant (P1369800) 

(12108.00) (14508.61) 

Oxygen Oxygen / Temperature electrode (12105.01) 43 Oxygen Oxygen* 

(12105.00) (14505.61) 

EOG Biological amplifier (65961.93) 46 without Universal recorder Electrooculography (P1350400) 

ECG ECG electrodes (65981.01) (14504.61) Electrocardiography (P1332700) 

EMG EMG electrodes (65981.02) Electromyography (P1350300) 

Lux Photo diode, BPW24, G1 (39119.01) 40 without Dependence of the luminous intensity 

on the distance (P1331500) 

Cardiac/vascular sonic Acoustic probe (03544.00) 38 without Cardiac and vascular sonic meas. (P1332600) 

pH-value pH electrode, plastic body, gel, 43 without CHEM-UNIT The automatic titration of ordinary vinegar 

BNC (46265.10) 

Redox electrode, 

BNC (46267.10) 

(14520.61) (P1370640) 

Potential Ag/AgCl reference electrode (18475.00) 42 Determination of the common salt content of meat broth 

(P1371440) 

Conductivity/Temperature Conductivity/temp.electrode (13701.01) 43 Determination of the Michaelis constant (P1369840) 

Temperature Temp.probe, imm.type, Pt1000 (12123.00) 

Thermocouple NiCr-Ni, sheathed (13615.01) 

Immersion probe NiCr-Ni, -50...1000°C (13615.03) 

Immersion probe NiCr-Ni, teflon, 300°C (13615.05) 

Surface probe NiCr-Ni (13615.04) 

Thermocouple NiCr-Ni, 500°C max. (13615.02) 

39 

Temperature probe Pt1000, glass, 

4-mm connectors (13702.01) 

40 

Voltage 

Current (Shunt) 

without 

Mass Balance 46 

BASIC-UNIT (12150.00) 

CHEM-UNIT (12153.00)

PHYCON 

USB-Interface 

PC-Software 

Sensor 

The PHYCON interface 

makes it particularly easy 

for you to get to grips with 

computer-aided 

experiments: 

• Its compact size makes it 

easy to handle 

• Is connected to the PC via 

the USB interface and is 

automatically identified by 

the operating system 

• Doesn’t require a power 

pack, as it is supplied with 

electricity from the PC via 

the USB interface 

• Ideal for multi-channel 

measurements, as up to 8 

PHYCON interfaces can be 

connected to a PC at any 

one time 

• Its low price makes its 

extremely suitable for 

student exercises too 

• Due to the clearly designed 

and intuitively used 

software you will quickly 

and easily obtain your 

measurement results 

• The large number of 

sensors available, which 

can be connected to 

PHYCON, enables universal 

use in physics, biology and 

chemistry lessons 

Force sensor 12558.00 

System overview PHYCON-USB-Interface 

InterfaceSoftware 

Sensors Detecting element Measured 

variable 

Voltage sensor, - 10...+ 10 V 

(12576.00) 

integrated in the sensor Voltage 

Differential voltage sensor, - 6...+6 V 

(12556.00) 


Instrument amplifier 

(12563.00) 


Current sensor, –0,6 .. +0,6 V 

(12555.00) 

integrated in the sensor Current 

Temperature sensor, –40 .. +130°C 

(12570.00) 

integrated in the sensor Temperature 

Surface temperature sensor, 

–40 .. +130 °C (12572.00) 


Temperature sensor, long, 

–50 .. +150°C (12571.00) 


Thermocouple box, NiCr-Ni, Thermocouple, micro-sheath (13615.01) Temperature 

–200 .. +1400°C (12573.00) Thermocouple, single (13615.02) 

Thermocouple, submersible sensor (13615.03) 

Thermocouple, surface (13615.04) 

Thermocouple, teflon (13615.05) 

Pressure sensor (barometer), 

810 .. 1060 hPa, absolut (12552.00) 

integrated in the sensor Pressure 

Pressure sensor, 0 .. 2100 hPa, 

absolut (12562.00) 

integrated in the sensor Pressure 

Force sensor, –50 .. +50 N, 

(12558.00) 

integrated in the sensor Force 

Magnetic field sensor integrated in the sensor Magnetic flux 

(12565.00) density 

Acceleration sensor, 25-g, 

–250 .. +250 m/s2 (12550.00) 

integrated in the sensor Acceleration 

Acceleration sensor, 5-g, 

–50 .. +50 m/s2 (12551.00) 

integrated in the sensor Acceleration 

Light sensor 

(12564.00) 

integrated in the sensor Illuminance 

UVA sensor, ~ 320 .. ~ 390 nm 

(12574.00) 

integrated in the sensor UV intensity 

UVB sensor, ~ 290 .. ~ 320 nm 

(12575.00) 

integrated in the sensor UV intensity 

Sound level meter, 0...130 dB 

(12569.00) 

integrated in the sensor Sound level 

Air humidity sensor, 0...95% 

(12567.00) 

integrated in the sensor Air humidity 

Electrode amplifier, -450...+1100 mV pH electrode, plastic, gel-filled, BNC (46265.15) pH-value 

(12560.00) pH electrode, plastic, refillable, BNC (46266.15) 

pH electrode, glass, refillable, BNC (46268.10) electrochemical 

Platinum redox electrode, plastic, gel-filled, BNC (46267.10) potential 

Conductivity sensor 

(12554.00) 

integrated in the sensor Conductivity 

Colorimeter, 430/470/565/635 nm integrated in the sensor Absorption 

(12553.00) Transmission 

Oxygen sensor for O2 (12557.00) 

integrated in the sensor Oxygen content 

Oxygen sensor for gaseous O2 (12566.00) 

integrated in the sensor Oxygen content 

ECG sensor 

(12559.00) 

integrated in the sensor ECG 

Heart rate sensor 

(12561.00) 

integrated in the sensor Pulse 

Pressure sensor, 0...2100 hPa, Respiratory frequency cuff (12568.00) Respiration 

absolute (12562.00) frequency 

PHYCON, USB-Interface (12500.00) 

Software PHYCON-Interface (14450.61) 

The Starter and students´ USB-Interface for Physics, Chemistry and Biology! 

28 different sensors 

The PHYCON interface software makes measuring easy: 

• Automatic sensor detection with visualisation of the 

connected sensors in the software 

• Up to 8 sensors can be connected at any one time 

• Clearly designed 

• All control elements are always visible 

• Intuitive to use 

• Real-time display of all measured values 

• The experiment parameters can be saved and reloaded 

• Many and diverse analysis functions in the main “measure” 

program

2005.07.15 Art. Nr.: 00200.02 

PHYWE SYSTEME GMBH & CO. KG 

Robert-Bosch-Breite 10 

D-37079 Göttingen 

phone: +49 551 604-0 

fax: +49 551 604-107 

E-Mail: int.sales@phywe.com 

Internet: www.phywe.com 

We reserve ourselves all rights concerning errors, translation, technical data, partial reproduction und photocopies!

Physics - Phywe

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