96A V/F preamp adjustment summary

This post explains how to calibrate your 96A V/F amplifier that is  used on PHI Auger and XPS surface analysis systems.   You will need a voltmeter, an oscilloscope, a 30 Meg ohm test resistor and two clip leads.

 96A V/F preamp Calibration procedure

1. Turn off the 32-100 electron multiplier supply (or the card rack power)
2. Remove the HV POS In, POS out and COL cables from the 96A V/F preamp
3. Remove the 96A V/F preamp cover.
4. Turn ON the 32-100 electron multiplier supply (or the card rack power)
5. Measure voltage between L1 and L2, should be 28 to 30V DC
6. Adjust R23 for 0V betweenTP2 and HV POS in.
7. Adjust R18 for zero Hz on Frequency output
8. Adjust R37 for 0V on Analog output
9. Connect 30 Meg ohm load resistor between L2 and the COL resistor
10. Adjust R8 for 1MHz on the frequency output
11. Adjust R28 for 10V on the Analog output
12. Remove the 30 Meg ohm load resistor
13. Adjust R18 for 100 Hz on the Frequency output
14. AdjsutR37 for .1V on the Analog output
15. Repeat steps 5 through 10.
16. Turn off the 32-100 or card rack power.
17. Replace the cover on the 96A V/F preamp.
18. Reconnect the HV POS In, POS out and COL cables to the 96A V/F preamp

96A potentiometer summary