HP 8642A Operation And Calibration Manual page 274

Performance Tests
4-24
Model 8642A/B
PERFORMANCE TESTS
9. FM Distortion
(1
kHz)
Preset the instruments. Set the measuring receiver to
FM
mode and
audio distortion mode. Turn off all audio Filters. Set the
HP
8642
amplitude to +10 dBm. Set the
HP
8642
RF
frequency and FM
deviation to the values listed in the table below. Verify that the
measuring receiver readings are less than the specified maximum.
FREQ
FM
Results
(MHz) (kHz)
Actual Distortion Max.
1050 72.0 0.4%
256 135.0
2.0%
4
67.5
4.0%