24. Adjust A1R318 for 5.045 V -0/+20 mV RMS. Same DVM
reading as in FIXED transition mode.
Gauss Amplitude
25. Set the HP 8 1 12A transition to GAUSS.
26. Adjust A1R418 for 5.045 V -0/+20 mV RMS. Same DVM
reading as in FIXED and LINEAR transition modes.
27. Use the DVM built-in filter and set the DVM to read DC
voltages.
If
the DVM does not have a built-in filter, use an
external low pass filter, as shown in Figure 9-6.
28. Switch COMPL on and off, and adjust A1R402 to obtain
the minimum amplitude difference between the two modes
0 V ± 10 m V (Same DVM reading).
29. Set up the HP 81 12A as follows:
Transition
HIL
LOL
LIMIT
Fixed
+8.0
v
-8.0
v
Off
30. Set up the DVM to read AC voltages up to 20 V. Switch filter
OFF or remove external filter.
3 1 . Check that the amplitude for FIXED, LINEAR and GAUSS
transition mode is 8.080 V -0/+40 mV RMS.
32.
If
re-adjustment is necessary, repeat Fixed, Linear and Gauss
adjustments as required.
Offset
33. Set up the HP 8 1 1 2A as follows:
HIL
LOL
+8.00
v
+7.90
v
34. Set up the DVM to read DC voltages up to 10 V.
35. Connect the HP 8 1 12A main output via an exact 50
n
0.13
feedthrough terminator to the DVM, and enable the DVM
built-in filter. If the DVM does not have a built in filter, use a
low-pass filter as shown in Figure 9-6.
36. Adjust A2R42 for 7.95 V ± 10 mV.
37. Set up the HP 8 1 12A as follows:
HIL
LOL
- 7.90
v
-8.00
v
38. Check accuracy of negative offset. DVM reading
-7.95 V ± 30 mV.
39. Re-adjust A2R42 if necessary.
Adjustment Procedures 9-17
Summary of Contents for 8112A
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Page 295: ...MP MP3 MP MP2 MP4 MPS MP 1 2 MPS MP MP I B ElElElEl Replaceable Parts A 3 ...
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Page 378: ...Figure B 14 Mechanical Parts 1 B 44 Backdating ...
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