HP 8591C, Руководство пользователя, Страница: 307 / 373

Specifications and Test Aids
Cable TV Measurement Specifications and
Characteristics
CSO and Distortion*
Optimum Input Range
Maximum Range
Manual CSOKTB Resolution
System CSOKTB Resolution
Accuracy
Manual composite second order end composite triple beet
distortions are measured relative to the visual carrier peak and require
momentary disabling of the carrier. Automatic measurements are made
in the channel above the channel selected and assumes that it is
unused. If the analyzer has Option 107, a non-interfering CSO
measurement can be made.
S e e
Input level dependent See
66 to 73 over optimum input range
0 . 1
1
Input level end measured CSOKTB dependent See graphs
f 1 . 5 t o f 4 . 0 o v e r o p t i m u m i n p u t r a n g e
“A preamplifier end preselector filter may be required to achieve specifications.
input range is determined et the time of measurement since a total input power measurement is first done to automatically set the
attenuator.
The following graphs summarize the HP 85721A personality characteristics for
C/N, CSO, and CTB testing on cable TV systems with up to 77 channels and
no amplitude tilt. C/N, CSO, and CTB measurement accuracies and ranges
can be read from the relevant graphs. They depend upon the visual carrier
peak level and the measurement reading and the total power input to the
analyzer. See Chapter 8 for test descriptions for each test.
9 - 6