HP 8901B Operation And Calibration Manual page 253

Model 8901B
COMMENTS
Inherent IF Component
Operation
RF I
AM OUTPUT contains a significant
IF
component which is greatest when operating at a carrier
frequency of 150 kHz.
Peak Detector Measurements of AM Output
The accuracy of measurements made on the AM OUTPUT signal could be degraded
if RF
level
measurements are made using the
F W
peak detector (Special Function 35.0).
AM Output
3-149