HP 8901B Operation And Calibration Manual page 407

Adjustments Model 890211
Resistance (kn) HP Part Number
26.1 0698-31 59
28.7 0698-3449
31.6 0698-5446
34.8 0757-0123
38.3 0698-31 61
-
Adjustment 9-FM Calibrator
REFERENCE
Service Sheet 29.
DESCRIPTION
The FM calibrator is set
to
CW and its frequency is adjusted while being monitored by the internal
counter. The calibrator is then set
to
modulate, and the symmetry is adjusted as the demodulated
signal is measured with the peak+ and peak- detectors. The computed peak deviation is checked and
if out of limits, a resistor is changed
to
bring the deviation within the proper limits.
NOTE
This
calibration adjustment
is
not critical. Built-in safeguards minimize
the possibility of erroneow Calibration. If conditions exist that are out
of
calibration, the Measuring Receiver displays an error message.
5-16 Adjustment 9-FM Calibrator
rev.15OCT88