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Note
10.
If
necessary, repeat steps 1 to 9 to achieve an equal and opposite
percentage deviation (up to ± 1 .53).
If the adjustment is not possible alter the value of A2VR2/R62 (See
table 9- 1 ) and repeat steps 1 to 9.
1 1 . Alter HP 8 1 12A PER to 20 ns.
12. Adjust the range
high
end with A2R3 for 19.5 ns ±0.2 ns.
13. Alter HP 8 1 12A PER to 99.9 ns.
14. Adjust the range
low
end with A2R57 for 102.5 ns ±0.2 ns.
15. Alter HP 8 1 12A PER to 50 ns.
16. Check that the
mid-range
reading for 50 ns ± 2ns.
17.
If
necessary, repeat steps 1 to 17 and adjust if necessary.
Delay (Double Pulse}
18. Set up the HP 8 1 12A as follows:
Trigger Mode
NORM
Control Mode
Off
PER
50 ms
DEL
1 ms
DTY
203
Transition
HIL
LOL
COMPL
DISABLE
LIMIT
Fixed
+3.0 v
0.0 v
Off
Off
Off
19. Set the counter as follows:
A --+ B
Time interval
Trigger (both chan)
1 ,
DC,
Z
=
50
n
20. Connect HP 8 1 12A Trigger Output to channel A of the counter.
2 1 . Connect HP 8 1 12A Output to channel B of the counter.
22. Set trigger levels to trigger at about 503 of amplitudes.
23. The typical DELAY (DBL) range characteristic is similar to that
shown in Figure 9-5.
24. Adjust the range
high
end with A2R14 for approx 13 above the
programmed value (i.e. l .Olms).
25. Alter HP 8 1 12A DEL to 9.99 ms.
26. Adjust the range
low
end with A2R15 for approx 13 above the
programmed value (i.e. 10. lms).
27. Alter HP 8 1 12A DEL to 3.5 ms.
Adjustment Procedures 9-1 1
Summary of Contents for 8112A
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Page 240: ...10 4 16 Servicing the Shaper and Output Amplifier ...
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Page 290: ...R B c R3 BD RY M I CROPROCESSOR 1 2 3 FIGURE 1 0 7 8 ...
Page 294: ... 8 X2l 2 X2 Figure A 1 Mechanical Parts 1 A 2 Replaceable Parts ...
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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