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Page Title:
DVM Logic Module A5A1 Calibration |
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  TB 11-6625-2974-30
Figure 4-6. Detector/Amplifier Adjustment Location.
(3) Disconnect DVM. Remove extender card and
4-4. DVM Logic Module A5A1 Calibration
reinstall DVM logic module in card cage.
a.
Antenna Detection Performance Check.
(4) Remove 50-ohm termination from RF IN J3
(1) Connect DVM to pin 21 (+) and pin 1 (-) of
connector.
extender card.
c.
DVM Logic Performance Check.
(2) Observe DVM. Reading should be 0.0 + 0.Vdc.
(1) Set METER SELECT switch (fig.4-1) to EXT
If the standard is met, perform step 3. If not, go
INPUT.
to subparagraph b (below) for adjustment.
(2) Connect a jumper wire between the two front
(3) Set STE PRIME POWER AC and DC switches
panel EXTERNAL INPUT jacks.
to OFF.
(3) Set STE PRIME POWER AC and DC switches
(4) Disconnect DVM. Remove extender card and
to ON.
reinstall DVM logic module in card cage.
(4) Observe front panel METER. Display should
(5) Remove 50-ohm termination from RF IN J3
be -00.
connector.
(5) Remove jumper wire from EXTERNAL INPUT
b.
Antenna Detection Adjustment.
jacks.
(1) Adjust A5A1-R52 (fig.-7) to obtain a reading of
(6) Using a DVM, adjust an external power supply
0.+ 0.1 Vdc on DVM.
for +30. + 0.05 V.
(2) Set STE PRIME POWER AC and DC switches
(7) Connect the power supply outputs to
to OFF.
EXTERNAL INPUT red (+) and gray (-) jacks.
4-8
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