I
-
Color
Test
Descriptions
(Chroma/Luma Delay
Inequality,
Differential
Gain,
Differential
Phase)
The color tests measure the chrominance-to-luminance delay inequality,
differential gain, and differential phase (Option 107 required).
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. Refer to Figure 8-12 and Figure 8-13.
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.
6. Large amounts of non-linear distortion, group delay, or ghosting may yield
results different from other test methods.
Surveying your system for test signal types and locations for each channel
will simplify test plan generation. Blank charts are located in Appendix
A. Copy these charts and fill in appropriate information using channel
measurement mode.
8-33
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