HP 8901B

Model 8901B
J.
Program Code
HP FILTER
ALL OFF HO
50 Hz H1
300 Hz H2
Operation
Audio Filters
Program Code
LP FILTER @+
ALL OFF LO
3 kHz L1
15 kHz L2
>20 kHz L3
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 HO or LO (respectively), or select another filter.
HP-IB PROGRAM CODES
Audio Filters 3-179