DS335 Synthesized Function Generator

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4-14 Performance Tests sine, 2.5 MHz, 3 Vrms sine, 3.0 MHz, 3 Vrms ____________ ____________ square, 10 Vpp ____________ ___________ Pass Fail DC Offset Accuracy (DC only) 5.0 V 4.940 V ___________ 5.060 V -5.0 V -5.060 V ___________ -4.940 V 0.0 V -0.0002 V ___________ 0.0002 V DC Offset Accuracy (DC + AC) 1 kHz, 10 Vpp, 0 Vdc -0.08 V ___________ 0.08 V 100 kHz, 10 Vpp, 0 Vdc -0.08 V ___________ 0.08 V 1 MHz, 10 Vpp, 0 Vdc -0.08 V ___________ 0.08 V 3.1 MHz, 10 Vpp, 0 Vdc -0.08 V ___________ 0.08 V Subharmonics sine, 102 kHz,10 Vpp ___________ -70dBc sine, 1.002 MHz,10 Vpp ___________ -70dBc sine, 3.1 MHz, 10 Vpp ___________ -70dBc Spurious Signals sine, 100 kHz ___________ -65 dBc sine, 2 MHz ___________ -55 dBc Harmonic Distortion sine, 100 Hz, 1 Vpp ___________ -60 dBc sine, 1 kHz, 1 Vpp ___________ -60 dBc sine, 10 kHz, 1 Vpp ___________ -60 dBc sine, 50 kHz, 1 Vpp ___________ -60 dBc sine, 500 kHz, 1 Vpp ___________ -50 dBc sine, 1 MHz, 1 Vpp ___________ -50 dBc sine, 3.1 MHz, 1 Vpp ___________ -40 dBc Phase Noise noise ___________ -60 db Square Wave Rise Time square, 1 MHz, 10 Vpp. 10% to 90% rise time ___________ 18 ns square, 1 MHz, 10 Vpp. Overshoots ___________ ±200 mV Square Wave Symmetry square, 1 MHz, 5 Vpp. + pulse width ___________ square, 1 MHz, 5 Vpp. - pulse width ___________ asymmetry = (+ width) - (- width) ___________ 13 ns DS335 Synthesized Function Generator
Calibration 4-15 CALIBRATION Introduction The calibration of the DS335 is composed of two parts: adjustment and calibration. Adjustments are actual physical adjustments to variable resistors and capacitors to correct the DS335's filters, and output amplifier response. Calibration is the process of determining the calibration constants ("calbytes") that the DS335 firmware uses to correct the output amplitude, etc.. The settings of the adjustments are, in general, very stable and should rarely require change. If the adjustments are changed the corresponding calibrations must be performed. However, the DS335 rarely requires complete recalibration to maintain its performance. It is recommended that the unit be sent back to the manufacturer in the case where a full recalibration is required. Calibration Enable The DS335 is shipped with calibration byte editing disabled. When calibration is disabled, direct access to the calbytes is prevented. The internal calibration enable jumper must be set to enable calibration. To set the jumper remove the DS335's top cover by removing its four retaining screws (this will break the calibration seal). In the center of the bottom circuit board is a three pin jumper labeled JP200. Setting JP200 between pins 1 and 2 enables calibration, setting it between pins 2 and 3 disables calibration. Calbytes The DS335's calibration is controlled by calibration constants ("calbytes") that the firmware uses to adjust the various output parameters. These calbytes are stored in the DS335's RAM. Recalibration of the DS335 involves determining the values of the calbytes and storing the new values in RAM. The calbyte values at the time of the DS335's production are also stored in ROM and may be recalled at any time. Direct access to the DS335's calbytes is allowed from both the front panel and computer interfaces after calibration is enabled. From the front panel press [SHIFT][9] once to display the calbyte menu line. There are two displayed parameters: on the left is the calbyte number, and on the right is the calbyte value. The calbyte number and value may be modified with either the keypad or the UP/DOWN ARROW keys. To select an item use the [SHIFT][DOWN ARROW] and [SHIFT][UP ARROW] keys. The calbyte number may be set between 0 and 554. The calbyte value may be set between -127 and 65536. The complete set of factory calbyte values may be recalled by pressing [SHIFT][9] twice to bring up the Clear Cal menu and then pressing any of the unit keys. The tables on the following pages lists the DS335 calbytes. Shown is the calbyte number, name, and meaning. DS335 Synthesized Function Generator
Page 1 and 2:
MODEL DS335 Synthesized Function Ge
Page 3 and 4:
Table of Contents i Table of Conten
Page 5 and 6:
Safety and Preparation for Use iii
Page 7 and 8:
Specifications v SPECIFICATIONS FRE
Page 9 and 10: Specifications vii SYNC & SWP/FSK O
Page 11 and 12: Abridged Command List ix Abridged C
Page 13 and 14: Getting Started 1-1 Getting Started
Page 15 and 16: Introduction 2-1 Introduction to Di
Page 17 and 18: Introduction 2-3 amplitude. The pos
Page 19 and 20: Features 2-5 Front Panel Features 1
Page 21 and 22: Features 2-7 Rear Panel Features 1)
Page 23 and 24: Function Setting 2-9 DS335 OPERATIO
Page 25 and 26: Function Setting 2-11 Vpp Vrms Func
Page 27 and 28: Sweeps & FSK 2-13 FREQUENCY SWEEPS
Page 29 and 30: Sweeps & FSK 2-15 External Frequenc
Page 31 and 32: DS335 Setup 2-17 INSTRUMENT SETUP I
Page 33 and 34: Programming Commands 3-1 PROGRAMMIN
Page 35 and 36: Programming Commands 3-3 parameters
Page 37 and 38: Programming Commands 3-5 *TRG The *
Page 39 and 40: Programming Commands 3-7 Hardware T
Page 41 and 42: Programming Commands 3-9 6 URQ Set
Page 43 and 44: Programming Examples 3-11 Program E
Page 45 and 46: Programming Examples 3-13 EXAMPLE 2
Page 47 and 48: Troubleshooting 4-1 TROUBLESHOOTING
Page 49 and 50: Troubleshooting 4-3 rate is 9600 ba
Page 51 and 52: Performance Tests 4-5 PERFORMANCE T
Page 53 and 54: Performance Tests 4-7 4) Increase t
Page 55 and 56: Performance Tests 4-9 2) Read the A
Page 57 and 58: Performance Tests 4-11 HARMONIC DIS
Page 59: Performance Tests 4-13 DS335 PERFOR
Page 63 and 64: Calibration 4-17 Now the post ampli
Page 65 and 66: Calibration 4-19 NECESSARY EQUIPMEN
Page 67 and 68: Circuitry 5-1 DS335 Circuit Descrip
Page 69 and 70: Circuitry 5-3 System DAC and S/H's
Page 71 and 72: Circuitry 5-5 Output Filters (DS335
Page 73 and 74: Circuitry 5-7 Power Supplies (DS335
Page 75 and 76: DS335 Component Parts List 5-9 Powe
Page 77 and 78: DS335 Component Parts List 5-11 REF
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DS335 Synthesized Function Generator

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