HP 8901B Operation And Calibration Manual page 398

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