Audio Detector Response - HP 8902A Quick Reference Manual

Model 8902A
Audio Detector Special
Response Function Code
Fast
5.0
SPCL
Slow 5.1 SPCL
Audio Detector Response
Program
Code
5.0SP
5.1 SP
FUNCTIONS
Special Function 5 (Audio Detector Response)
DESCRIPTION
When making modulation measurements, both the udio
p
Operation
ak detector 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 Measuring Receiver 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 rcsponsc timc for SINAD is not availablc with Grmwarc datc codcs 234.1985 and bclow. (To display thc firmwarc
date codc. sclcct 42.0 SPCL.) To ordcr a
ROM
scl
that
contains this spccicil function. contact thc ncarcst HP salcs office.
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