Audio Filters - HP 8901B Operation And Calibration Manual

Model
8901B
J .
Program Code
HP FILTER
ALL
OFF
HO
50 H z
H1
300 H z
H 2
Operation
Audio Filters
Program Code
LP FILTER
@+
ALL OFF LO
3 k H z L1
15 k H z L 2
>20 k H z L 3
FUNCTIONS
HP FILTER, LP FILTER
DESCRIPTION
High-pass and low-pass filters can be inserted in the path of the demodulated signal.
The filters are used for such tasks as rejecting interfering audio
signals
such as line hum and sub-carriers.
They
also
provide pre-defined bandwidths for residual noise measurements.
PROCEDURE
Insert the desired demodulated signal filter by selecting the appropriate keys. Only one high-pass and
one low-pass filter can be inserted at once.
To remove a filter, select the key again.
To
select a different filter, press the key corresponding to the desired filter.
HP-IB codes for the various filter keys (listed in the following table) only insert the filters. To remove
a high-pass or low-pass filter via
HP-IB,
use code H O or L O (respectively), or select another filter.
HP-IB PROGRAM CODES
Audio Filters 3-179