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Test Descriptions
Composite Triple Beat
(CTB)
Test Description
When
CXVCTB
is pressed the analyzer measures the total power at the
input, the level of the channel to be measure,d, and the analyzer noise floor.
Based on this information it decides what the analyzer attenuator should
be set to. In addition it alerts you when it thinks additional attention is
needed. This is indicated by the presence of message (See MORE INFO) in
the lower right hand corner of the screen. This message occurs when the
cable noise floor is within 3
dB
or the analyzer noise floor. It is intended to
alert the operator that the analyzer signal-near-noise correction is kicking in.
In addition, the message is presented in inverse video when the cable noise
floor is within 2.2
dB
of the analyzer noise. This indicates the analyzer is
correcting the result by more than 3
dB
and the measurement uncertainty of
the result is rising. It is intended that you raise the input level and preselect
if necessary.
8-21
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