HP 8901B Operation And Calibration Manual page 295

Operation
Model 8901B
The function of MODULATION OUTPUT/AUDIO INPUT connector is controlled
by
the AUDIO
INPUT key. The connector has an input impedance of approximately 100 k0.
- -
AUOIO FILTERS
AN0 GAIN AUOIO
CONTROL COUNTER COUNTER OISPLAY
I
Audio Fkequency Block Diagram
COMMENTS
Relative Measurements
If audio frequency is to be displayed relative to a reference, enter the value as a ratio reference using
the Ratio function. (Refer to Ratio on page 3-215.)
Finer Resolution for Frequencies from 100 to 250 kHz
Special Function 32.1 enables a resolution of 0 . 1 Hz for frequencies 100 to 250 kHz. For
dB
measurements, this special function enables a resolution of 0.001
dB
instead of the normally displayed
resolution of 0.01
dB.
The selection of Special b c t i o n 32.0 or 32.1 i s maintained through instrument
power down.
3 2 . 0 Audio frequency is displayed with the normal resolution of 1
H z
for frequencies from 100 to
3 2 . 1 Audio frequency i s displayed with a resolution of 0 . 1 Hz for frequencies from 100 to 250 kHz.
32.2 Displays 0 if the normal measurement resolution is enabled (32.0 SPCL) and displays 1 if a finer
250 kHz.
resolution is enabled (32.1 SPCL).
This special function is not available with firmware date codes 234.1985 and below. (To display the firmware date code, select
42.0 SPCL.) To order a
ROM
set that contains this special function, contact the nearest HP sales ofice.
3-200
Audio Frequency