HP 8901B Operation And Calibration Manual page 219

Operation
Model 8901B
HP-IB PROGRAM CODES
dB
EXT ATTEN off
=
N O
dB
EXT ATTEN on
=
N1
SPCL = SP
When the
dB
EXT ATTEN key is pressed, the Modulation Analyzer displays subsequent level
measurements using the entered
dB
offset.
COMMENTS
Inputloutput Status
MODULATION OUTPUT/AUDIO INPUT is blanked during most level measurements.
External Attenuation Value is Stored Through Other Measurement Selection
If another Measurement mode is selected while the external attenuation function is enabled and a
level Measurement mode is re-entered, the instrument automatically re-enters the external attenuation
mode with the previous offset.
3-106 External Attenuation
(dB)