Audio Detector Response - HP 8901B Operation And Calibration Manual

Model
8901B
Operation
Audio Detector
Response
Audio Detector Response
Special
Function Code
FUNCTIONS
Special Function
5
(Audio Detector Response)
Fast
Slow
DESCRIPTION
5.0 SPCL 5.0SP
5.1
SPCL 5.1SP
When making modulation measurements, both the audio p-ak detect r response (for peak measure-
ments including
SINAD)'
and the digital averaging response (for rms measurements) are usually fast.
A slower response time (narrower detection bandwidth) can be enabled using Special Function 5.1.
The slow response time improves measurement readability on unstable or noisy signals whenever display
jitter is excessive.
PROCEDURE
The Modulation Analyzer is normally set for fast response. To change from fast to slow or vice versa,
enter the corresponding Special Function code, then select
SPCL.
COMMENTS
Default Condition
When the instrument is first turned on or when Automatic Operation or Instrument Preset is selected,
the response time returns to fast.
The slow response time for SINAD 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 office.
Audio Detector Response 3-177