HP 437B - ANALOG BOARD FUNCTIONAL VERIFICATION (continued)

HP 437B
Service Sheet BD1
8-30
Note
SERVICE
LE
2. Set the range calibrator as follows:
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3. Press the PRESET/LOCAL key, then the ENTER key.
4.
Press
the
ZERO
key
on
the
Power
Meter.
The
Power
Meter
should
perform
the
zeroing
function.
If
the
Power
Meter
will
not zero,
proceed
to
the
Analog
Board
Troubleshooting
Procedure.
5. Set the FUNCTION switch on the range calibrator to CALIBRATE.
6. Press the Power Meter’s dBm/W key for a reading in watts.
7. Press the CAL key on the Power Meter.
8. Press +) or) until the display reads "REF CF 100.0%".
9. Press the Power Meter’s ENTER key. The Power Meter should
perform the calibration function. Verify that the Power Meter display
reads 1.00 +0.001 mW.
10. If the Power Meter will not calibrate, proceed to the Analog Board
Troubleshooting Procedure.
11. Set the range calibrator’s RANGE switch to the positions shown in the
following table. For each setting, verify that the Power Meter’s reading
is within the limits shown.
If the readings are not within limits when the range calibrator is set to 10
mW or 100 mW, ranges 4 and 5 may need adjustment. Perform Adjustment
5-4, Ranges 4 and 5 Shaper Adjustment, in Section 5 of this service manual
and then retest the Power Meter at 10 mW and 100 mW.
Range
Calibrator Actual
Setting Results
10.10 pW
100.5 un. W
1.005 mW
10.05 mW
100.5 mW
If the Power Meter does not meet these limits, a problem may exist with
A4U5, A4U7, or A4R16, 17, 24, 25, or 26. Replace these components. If