HP 8591C User Manual page 50

If GATING YES NO is set to YES, upon executing the carrier-to-noise or
CSO measurements, the analyzer automatically searches for a quiet line (a
line with no video modulation) starting at the default line.
N O T E
The default quiet line number for carrier-to-noise and CSO is 12, and both fields. The default line
number for the in-channel frequency response test is 19, and both fields. For differential gain,
differential phase, and chromalluma delay inequality, the default test signal line number is 18, and the
field is odd.
If the analyzer Ends a quiet line, and if PAUSE YES NO is set to NO, the
analyzer will automatically execute the measurement without requiring
the channel's video modulation to be turned off (non-interfering). If
PAUSE YES NO is set to YES, the analyzer will pause upon Ending a quiet
line. At this point, if a quiet line is displayed, press CONTINUE to execute
the measurement. If a quiet line was not found, you must search for it
using the m (step up) and (iJJ (step down) keys.
If GATING YES NO is set to NO, upon executing the carrier-to-noise
or CSO measurements, you will be prompted to turn off modulation to
execute the measurement in an interfering manner.
7. Fbr analyzers with Option 107: Press PAUSE YES NO to select between
pausing (YES) before executing a gated (non-interfering) or video
measurement, or, upon Ending a quiet line or test signal, execute the
measurement immediately (NO).
This function applies to carrier-to-noise and CSO when performing
these measurements in a gated (non-interfering) manner. This function
also applies to the video measurements: differential gain, differential
phase, and chroma/luma delay inequality. When executing the video
measurements, the analyzer automatically searches for the appropriate test
signal. Refer to each test's description to see how each test operates.
Channel Measurements
Making Channel Measurements
2-7