Model
8901B
Adjustments
Adjustment
3
RF LEVEL DETECTOR OFFSET
0
Service
Sheet
4
Description
With no RF input, the output from the RF level detector
is
adjusted for
0
Vdc while monitoring
it
with the internal voltmeter.
Procedure
1.
Remove any cable from the Modulation Analyzer’s INPUT.
2.
Press
RF
POWER.
3.
Key in 0.024 SPCL
to
switch out the 5.25 MHz high-pass filter
and
to
set the
RF
Level Detector
to
normal output. Then, key in
49.31
SPCL
to
display the
RF
level with respect
to
RF
ground.
These steps
set
the input for an RF level measurement and connect the internal voltmeter
to
the
RF
detector output.
4.
Adjust A15R42 (DET OFS) for
a
display between -0.001 and 0.001.
Adjustment
3
5-7
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