HP 8591C User Manual page 295

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
2. Multiple test signals may be present and may return different results due
3. Commercial insertion equipment may cause test signals to not be
4. Visual signal levels greater than +20 dBmV will provide best results.
5. Non-standard timing in signal composition may not yield specified
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
meaningful results.
to their point of origin.
transmitted.
If this occurs during a test, the results will not be valid.
accuracy.