Sample servo diagrams and Bode plots. Acousto optic performance plots Unlock servo Measure gain and phase vs drive input 1 2 5 10 20 50 100 200 500 1K.

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Presentation transcript:

Sample servo diagrams and Bode plots

Acousto optic performance plots Unlock servo Measure gain and phase vs drive input K 2K 5K 10K 20K50K100K200K Photodiode output divided by voltage input to microwave AOM driver K 2K 5K 10K 20K50K100K200K Phase of photodiode output referenced to voltage input to microwave AOM driver Frequency (Hz)

Fabry-Perot driver performance Unlock servo -- use high voltage, divide by 10 scope probe Measure gain and phase vs drive input K 2K 5K 10K 20K50K100K200K HV amp output divided by voltage input to HV amp K 2K 5K 10K 20K50K100K200K Phase of HV amp output referenced to phase on HV amp input Frequency (Hz)

Servo performance plots Measure difference amp output and integrator output K 2K 5K 10K 20K50K100K200K Difference amp output voltage Minimum measurable signal K 2K 5K 10K 20K50K100K200K Integrator output voltage Minimum measurable signal Frequency (Hz)

Servo phase plots Measure phase difference between integrator and difference amp output K 2K 5K 10K 20K50K100K200K Phase difference between integrator & diff amp Frequency (Hz)

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

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

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

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