External Attenuation - HP 8901B Operation And Calibration Manual

Model 8901B Operation
External Attenuation (dB)
FUNCTIONS
dB
EXT ATTEN, Special F'unction
25
(External Attenuation
dB)
DESCRIPTION
Level measurements can be scaled to correctly indicate the power at the input of an external attenuator
or amplifier connected to the instrument.
Special F'unction
25.2
causes display of the value of the selected external
dB
attenuation or gain.
PROCEDURE
To enter external attenuation:
1.
Select the keys corresponding to the magnitude of external attenuation or gain expressed in
dB.
2.
If the offset is gain rather than attenuation, designate the value as negative by selecting the
Blue Key and minus-sign
(-1
key (the decimal key). No sign indication is necessary for entering
attenuation.
3. Select
dB
EXT ATTEN (Blue Key, LOG/LIN).
To display the current offset in
dB,
key in
25.2
SPCL.
To exit external attenuation, select
dB
EXT ATTEN again.
To re-enter external attenuation, select
dB
EXT ATTEN again.
EXAMPLE
To account for an external 10
dB
amplifier connected to the instrument:
LOCAL
(keystrokes)
(program codes)
-10 N1
Data Display
External Attenuation
(dB)
3-105