HP 8901B Operation And Calibration Manual page 321

Operation
Model 8901B
A
--
-k'.
I
Manual Settings Not Allowed with RF Level Measurements
Manual setting of
RF
input attenuation is overridden when RF Level measurements are selected.
TO OTHER MEASUREMENT
CI R CU
ITS
Block Diagram
of
RF Input Attenuation
3-232 RF Input Attenuation