CR200/CR200X Series Dataloggers - Campbell Scientific

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Section 4. Sensor Support Figure 27: Voltage Measurement Accuracy (0° to 40° C) 4.2.3 Voltage Range The CR200(X) has one analog voltage range of 0 to 2.5 volts. The resolution for a single A/D conversion is 0.6 millivolts. 4.2.4 Integration Integration is used to reduce the noise included in a measurement. The CR200(X) uses a form of digital integration. It makes 10 A/D conversions and averages them for the result returned. The A/D conversions are made every 26 microseconds. Averaging will also reduce signal noise from the sensor such as when water level measured with a pressure transducer is changing because of pressure fluctuations caused by wind. Averaging also has an effect on the resolution. The resolution seen in the numerical result is the resolution of a single A/D conversion (0.6 mV) divided by the number of A/D conversions (10). 40
Section 4. Sensor Support 4.2.5 Self-Calibration A calibration measurement to measure the ground offset is made at the beginning of each measurement instruction that includes a voltage measurement. This calibration takes about 400 microseconds. Only one calibration measurement is made per instruction regardless of the number of reps. The battery voltage is checked every 8 seconds to ensure it is within the allowable range. 4.3 Bridge Resistance Measurements Many sensors detect phenomena by way of change in a resistive circuit. Thermistors, strain gages, and position potentiometers are examples. Resistance measurements are special case voltage measurements. By supplying a precise, known voltage to a resistive circuit, then measuring the returning voltage, resistance can be calculated. Two bridge measurement instructions are included in the CR200(X), ExDelSE () and Therm109 (). ExDelSE () is used with sensors that have a simple half bridge circuit. Therm109 () is used with Campbell Scientific’s 109-L thermistor probe. Sensors with bridge circuits that require a differential voltage measurement, such as full bridge or 3-wire half bridge, cannot be measured with the CR200(X). FIGURE. Half Bridge Circuit Used with ExDelSE (p. 41) shows the circuit that is typically measured with ExDelSE (). In the diagram. Rs is normally the sensor and Rf is normally a precision fixed (static) resistor. Vx is the excitation voltage (either 2500 or 5000 mV) and V1 is the voltage (mV) measured by the analog input channel. Calculating the resistance of a sensor that is one of the legs of a resistive bridge requires additional processing following the bridge measurement instruction. FIGURE. Half Bridge Circuit Used with ExDelSE (p. 41) lists the schematics of a typical half bridge configuration and the calculations necessary to compute the resistance of any single resistor, provided the value of the other resistor in the bridge circuit is known. Figure 28: Voltage Excitation Bridge Circuit 41
Page 1: OPERATOR’S MANUAL CR200/CR200X Se
Page 4 and 5: Assistance Products may not be retu
Page 6 and 7: Table of Contents 4.4 Pulse Count M
Page 8 and 9: Table of Contents 11.4.3 SDI-12 Pow
Page 10 and 11: Table of Contents Index ...........
Page 12 and 13: Table of Contents CRBASIC EXAMPLE 1
Page 14 and 15: Section 1. Introduction Table 1. CR
Page 16 and 17: Section 2. Quickstart Tutorial 2.1.
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Page 24 and 25: Section 2. Quickstart Tutorial Exam
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Page 36 and 37: Section 3. Overview Figure 25: Feat
Page 38 and 39: Section 3. Overview Period Average:
Page 40 and 41: Section 3. Overview 3.1.3.4 Power T
Page 42 and 43: Section 3. Overview 3.1.5.1 Firmwar
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Page 46 and 47: Section 3. Overview Table 3. Intern
Page 48 and 49: Section 3. Overview 36
Page 50 and 51: Section 4. Sensor Support 4.1.3 Swi
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Page 62 and 63: Section 5. Measurement and Control
Page 64 and 65: Section 5. Measurement and Control
Page 66 and 67: Section 6. CR200(X) Power Supply Au
Page 68 and 69: Section 7. Grounding 7.1.1 Lightnin
Page 70 and 71: Section 7. Grounding Examples: •
Page 72 and 73: Section 8. CR200(X) Configuration F
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Page 78 and 79: Section 8. CR200(X) Configuration
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Page 82 and 83: Section 9. Programming in the Logge
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Page 88 and 89: Section 9. Programming CRBASIC EXAM
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Section 9. Programming 9.11 Program
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Section 9. Programming 92
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Section 10. CRBASIC Programming Ins
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Section 11. Programming Resource Li
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Section 12. Memory and Data Storage
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Section 13. Telecommunications and
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Section 14. PakBus Overview • Rou
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Section 14. PakBus Overview 14.4.6
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Section 14. PakBus Overview 14.5.3
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Section 15. Alternate Telecoms Reso
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Section 15. Alternate Telecoms Reso
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Section 16. Support Software 16.4 P
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Section 16. Support Software 146
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Section 17. Care and Maintenance Fi
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Section 17. Care and Maintenance 15
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Section 18. Troubleshooting 18.1.1.
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Section 18. Troubleshooting Table 2
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Section 18. Troubleshooting 18.3.3
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Section 18. Troubleshooting 18.3.3.
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Section 18. Troubleshooting 160
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Appendix A. Glossary baud rate sett
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Appendix A. Glossary Earth Ground u
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Appendix A. Glossary modem/terminal
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Appendix A. Glossary period average
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Appendix A. Glossary the table is e
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Appendix A. Glossary VAC Volts Alte
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Appendix A. Glossary 14
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Appendix B. Status Table and Settin
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Appendix C. Serial Port Pin Outs 22
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Appendix D. ASCII / ANSI Table Dec
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Appendix D. ASCII / ANSI Table Dec
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Appendix F. Sensors and Peripherals
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Index Debugging • 151 Declaration
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Index O Offset • 86 Ohm • 6 Ohm
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Index U UPS • 11 User Program •
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CR200/CR200X Series Dataloggers - Campbell Scientific

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