DS335 Synthesized Function Generator

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4-18 Calibration The last table of 160 words contains sync symmetry values as a function of frequency when sines or squares are selected. There are three values which precede the table: these are used to control the sync duty cycle for triangles, ramps, and noise. 392 TRI_SYM Triangle sync symmetry.0 to 4095. Nominal 2048. 393 RAMP_SYM Ramp sync symmetry. 0 to 4095. Nominal 2048. 394 NOISE_SYM Noise sync duty. 0 to 4095. Nominal 2048 395 SYM_0 0 to 4095. Nominal 2048. For dc to 19530 Hz. 396 SYM_1 0 to 4095. Nominal 2048. For 19,531 to 39,062 Hz. 397 SYM_2 0 to 4095. Nominal 2048. For 39,063 to 58,593 Hz. : : : 554 SYM_159 0 to 4095. Nominal 2048. For 3105468 to 3125000 Hz. DS335 Synthesized Function Generator
Calibration 4-19 NECESSARY EQUIPMENT The following equipment is necessary to complete the adjustments and calibrations. The suggested equipment or its equivalent may be used. Instrument Critical Specifications Recommended Model Analog Oscilloscope 350 MHz Bandwidth Tektronix 2465 Time Interval Counter Frequency Range: 20 MHz min. SRS SR620 Time Interval Accuracy: 1ns max FFT Spectrum Analyzer Frequency Range: DC to 100 kHz SRS SR760 Amplitude Accuracy: ±0.2 dB Distortion: < 75 dB below reference RF Spectrum Analyzer Frequency Range: 1 kHz to 100 MHz Anritsu MS2601/ HP4195A Amplitude: ±0.5 dB Distortion and Spurious: < -70 dB DC/AC Voltmeter 51/2 Digit DC accuracy Fluke 8840A True RMS AC to 100 kHz Thermal Converter Input Impedance: 50 Ω Ballantine 1395A-3 Input Voltage: 3 Vrms Frequency: DC to 10 MHz Accuracy: ±0.05dB 10 MHz Frequency Standard Frequency: 10 MHz ± .001 ppm SRS FS700 Phase Noise: < -130 dBc @ 100Hz 50 W Terminator 50 Ω ± 0.2 %, 1 Watt HP 11048C ADJUSTMENTS The following adjustments set the values of all of the variable components in the DS335. After an adjustment has been made the associated calibrations must be made. All adjustments must be complete before calibration is started. First, remove the DS335's top cover by removing the four retaining screws.) Set the "cal enable" jumper (JP200 switch 2) between pins 1 and 2. NOTE: The chassis ground and circuit ground float relative to each other. For voltage measurements use the FUNCTION output BNC shield as a ground reference. Output Amplifier Bandwidth These adjustments correct the bandwidth of the output amplifier. A complete calibration must be performed if these adjustments are changed. All of the adjustments are on the bottom PCB. Use an insulated adjusting screwdriver. 1) Connect the output of the DS335 to the oscilloscope with a 50W terminator. Set the DS335 to square wave, 8 Vpp, 100 Hz. Set the scope to 2 V/div vertical and 5 ms/div horizontal. Adjust R703 for the squarest output waveform. 2) Set the scope to 200ns/div. Adjust C707 for the fastest output risetime without excessive overshoots. 3) Do a complete calibration of the DS335 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 and 60: Performance Tests 4-13 DS335 PERFOR
Page 61 and 62: Calibration 4-15 CALIBRATION Introd
Page 63: Calibration 4-17 Now the post ampli
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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