Section 7
7-22
8. Turn the 6675A Power ON.
9. Enter into the Sofcal Diagnostic menu.
10. Set the Speed to "Slowest" (reset) and the number of turns to 648.
11. Using a 10 M input impedance DMM, monitor the voltage at Rs
C
2
with respect to Rs C
1
(use the 2 V range on the DMM).
12. Note the voltage at Rs C
2
with respect to Rs C
1
.
13. Set the current to 0.3 mA.
14. Note the voltage swing at Rs C
2
with respect to Rs C
1
.
15. Set the current to 0 mA.
16. Remove the 1 k resistor and connect a 100 k, 0.1% ULT resistor
across Rs C
1
and Rs C
2
.
17. Using a 10 M input impedance DMM, monitor the voltage at Rs
C
2
with respect to Rs C
1
(use the 200 V range on the DMM).
18. Note the voltage at Rs C
2
with respect to Rs C
1
.
19. Set the current to 0.3 mA.
20. Note the voltage swing at Rs C
2
with respect to Rs C
1
.
21. If necessary, adjust potentiometer R116 on the Servo-loop PCB to
obtain a voltage swing of within 0.1 % of 99x the voltage swing
noted in Step 15.
22. Set the current to 0 mA and the number of turns to 0.
23. Remove the 100 k resistor and reconnect the 1 k 0.1% resistor
across Rs C
1
and Rs C
2
.
24. Repeat Steps 11 to 22.
25. Record the voltages and the voltage swings.
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