HP 8591C, Руководство пользователя, Страница: 306 / 373

Specifications and Test Aids
Cable TV Measurement Specifications and
Characteristics
Depth of Modulation
AM Range
Resolution
Accuracy
Percent AM is measured from horizontal sync tip to maximum video
level; measurement requires a white-reference
and may not be
valid for scrambled channels.
5 0 t o 9 3 %
0 . 1 %
f o r C / N 4 0
Digital Channel Power
Measurement Characteristic
Accuracy for 6 MHz channel bandwidth and 10 averages
FM Deviation
(characteristic1
Range
Resolution
Accuracy
Peak reading of FM deviation
1 0 0 H z
Disturbance
A M R a n g e
Resolution
Accuracy
Power-line frequency and low-frequency disturbance measured on
modulated and/or unmodulated carriers. May not be valid for scrambled
channels.
0 . 5 t o 1 0 %
0 . 1 %
f o r h u m
f o r h u m
f o r h u m
Visual Carrier-to-Noise Ratio
Optimum Input Range
Maximum C/N Range
C/N Resolution
C/N Accuracy
The C/N is calculated from the visual-carrier peak level end the minimum
noise level, normalized to 4 MHz noise bandwidth.
S e e
Input level dependent See
0 . 1
Input level and measured C/N dependent
t o f 3 . 5 o v e r o p t i m u m i n p u t r a n g e
‘A preamplifier and preselector filter may be required to achieve specifications.
input range is determined at the time of measurement since total input power measurement is first done to automatically set the
attenuator.
9 - 5