HP 436A Operating And Service Manual page 72

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Model 436A
Adjustments
ADJUSTMENTS
5-18. SPIKE BALANCE ADJUSTMENT (cont'd)
EQUIPMENT:
PROCEDURE:
RANGE CALIBRATOR
POWER METER
DDD©l~D
l
POWER
MET~R
SENSOR
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Figure 5-3. Spike Balance Adjustment Setup
Range Calibrator. . . . . . . HP 11683A
1. Set the Power Meter switches as follows:
CAL FACTOR%
POWER REF .
MODE . . . .
RANGE HOLD
LINE . . . .
100
off (out)
WATT
off (out)
ON (in)
2. Set the Range Calibrator switches as follows:
FUNCTION.
POLARITY.
RANGE
LINE . . .
CALIBRATE
NORMAL
100
µW
ON
(in)
3. Remove the Power Meter top cover and adjust the front-panel CAL ADJ control
so that the digital readout indicates 100.0
µW
4. Press and hold the Power Meter SENSOR ZERO switch and adjust BAL poteni-
ometer A3R65 so that the display readout indicates 60.0
±
0.2 µW.
NOTE
The Power Meter sensor zero circuit must be
re-zeroed as described in the following steps
before valid power measurements can be made.
5. Set the Range Calibrator FUNCTION switch to standby. Then press the Power
Meter SENSOR ZERO switch and wait for the digital readout to stabilize.
6. Release the Power Meter SENSOR ZERO switch and wait for the ZERO lamp to
go out .
5-5