HP 8901B Operation And Calibration Manual page 201

Operation Model
8901B
COMMENTS
Input/Output Status
MODULATION OUTPUT/AUDIO INPUT is turned off during this measurement. However, AM
OUTPUT and FM OUTPUT (rear panel) remain active but uncalibrated. The tuning of the instrument
remains unchanged.
Relative Measurements
If RF level is to be displayed relative to a reference, enter the value as a ratio reference using the RATIO
key. (Refer to
Ratio
on page 3-215.)
Measuring RF Level on Signals with AM
If the RF input signal has AM, the peak envelope power is measured.
Previous Input High-Pass Filter Selection
The input high-pass filter (Special Function 3) remains inserted if previously selected.
Error 06
The maximum allowable input level is 1W into
500.
Input levels greater than 1W cause the overpower
relay to open and the display to show Error 06. To reset the relay, remove the input signal and select
any measurement key.
3-86 RF Level