Note the insertion diagram in Fig. You will want to use the FCC Composite VITS test signal as shown in Fig. 4, since it will permit making most of our other tests. Be sure that the test signal chosen is compatible with the measurement device and the equipment under test. Test signals such as the NTC-7 Composite, which have signals above the 100 IRE level can over modulate the carrier generating excessive Differential Gain and Phase errors. As mentioned earlier, if you have Differential Phase distortions, you will likely find Differential Gain distortions also.
Operators are still responsible for meeting the requirements on all channels at all times.
Chroma to Luma Delay causes poor color to luminance picture registration. Here is the detailed information on the FCC Rules and Regulations. Proof of performance tests . Chrominance to Luminance Delay, sometimes called Chroma Delay, is the measurement, in time, that the chrominance component of the video signal is delayed through the system, referenced to the luminance signal and stated in nanoseconds. The specification is 170 nSec by coincidence.