I
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FM
Deviation
Test
Description
Note that to perform this measurement, Option 102 is required on HP 8590
E-Series cable TV analyzers. This option is standard for the HP 8591C
analyzer.
The FM deviation test reports the maximum peak deviation found during 25
sweeps (or cycles). The number of cycles per measurement can be adjusted
by pressing
CYCLEWMSMT
in Channel mode.
The maximum and minimum deviations are held for the number of sweeps
set in
CYCLES/MSMT
. The peak-to-peak result is calculated then divided by
2 to get peak deviation. If a test signal were used, the peak deviation could
be measured in one sweep. Live audio is normally used with CYCLESIMSMT
set to 25 or more to ensure that peak deviations are found and results are
consistent.
The peak FM deviation result is the sum of all the components of the FM
signal at an instant in time. This is controlled by the program material and
whether it is mono, stereo, second audio program, etc.
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