I
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Test Descriptions
In-Channel Frequency Response Test Description
The following steps must be considered when performing these
measurements:
1. An appropriate test signal must be present or the test will not return
meaningful results.
2. Multiple test signals may be present and may return different results due
to their point of origin.
3. Commercial insertion equipment may cause test signals to not be
transmitted.
If this occurs during a test, the results will not be valid.
4. Visual signal levels greater than
+20
dBmV
will provide best results.
5. Non-standard timing in signal composition may not yield specified
accuracy.
Surveying your system for test signal types and locations for each channel
will simplify test plan generation. Blank charts are located in Chapter
9. Copy these charts and
hll
in appropriate information using channel
measurement mode.
Relative Measurements A channel could be measured coming into the
headend
processing equipment
and compared to that leaving the
headend
to determine the
headend
equipment’s effect.
8-42
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