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Sample servo diagrams and Bode plots

Sample servo diagrams and Bode plots. Acousto optic performance plots. Photodiode output divided by voltage input to microwave AOM driver. Unlock servo Measure gain and phase vs drive input. 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K. Frequency (Hz).

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Sample servo diagrams and Bode plots

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  1. Sample servo diagrams and Bode plots

  2. Acousto optic performance plots Photodiode output divided by voltage input to microwave AOM driver • Unlock servo • Measure gain and phase vs drive input 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz) Phase of photodiode output referenced to voltage input to microwave AOM driver 0 -90 -180 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz)

  3. Fabry-Perot driver performance HV amp output divided by voltage input to HV amp • Unlock servo -- use high voltage, divide by 10 scope probe • Measure gain and phase vs drive input 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz) Phase of HV amp output referenced to phase on HV amp input 0 -90 -180 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz)

  4. Servo performance plots Difference amp output voltage • Measure difference amp output and integrator output Minimum measurable signal 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz) Integrator output voltage Minimum measurable signal 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz)

  5. Servo phase plots • Measure phase difference between integrator and difference amp output Phase difference between integrator & diff amp -90 -180 -270 1 2 5 10 20 50 100 200 500 1K 2K 5K 10K 20K50K100K200K Frequency (Hz)

  6. Entire servo Labels in bold are for connections or adjustments on the outside of the box Lock/unlock switch Rotary switch 10 pF 100 pF +15V 1,000 pF Lead 100K log pot 10,000 pF 10 M Integrator drift compensation 100K 10 turns 50K 0.1 mF 20K 1 M 100 W 50K Modulation input - 15V Signal in 100K 1 M 50K 20K 150 W Reference in 100W Diff amp gain 100K 1 M Servo output Scan input Diff amp balance > 50K +15V Integrator output 50K +15V 20K DC reference 100K 20K DC ref switch DC input 100K Diff amp output - 15V - 15V

  7. Differential amplifier stage Labels in bold are for connections or adjustments on the outside of the box 50K 50K Signal in 100K To integrator 50K Reference in Diff amp gain 100K Diff amp balance > 50K +15V 50K DC reference 100K DC ref switch Diff amp output - 15V

  8. Integrator stage Labels in bold are for connections or adjustments on the outside of the box Lock/unlock switch Rotary switch 10 pF 100 pF +15V 1,000 pF Lead 100K log pot 10,000 pF 1 M Integrator drift compensation 100K 0.1 mF 100 W - 15V 1 M From diff amp out To summing amp 100W Integrator output

  9. Summing amplifier stage Labels in bold are for connections or adjustments on the outside of the box 20K 1 M Modulation input 20K From integrator 150W Servo output 1 M Scan input +15V 20K DC input 100K 20K - 15V

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