Deviser S7200 User Manual page 107

CCIR 330 test signal
The first peak from the left is a white flag with peak amplitude of 700mV (relative to blanking level) and a
width of 10µs; a zero carrier reference (base white) for measuring video signal amplitude and depth of
modulation. The second from the left is 2T pulse with a half-amplitude width of 200ns, it is used to measure K
factor. Cable TV systems use K-2T factor to replace echo measurement. The third from the left is the
blanking level and 5 luminance steps superimposed with a 4.43MHz color subcarrier sine wave; the color
burst is 280mV and used to lock color signal phase. The 5-step luminance staircase and blanking is used to
represent six different luminance levels. This third part of the signal is used to measure DG and DP.
The VITS composite signals are composed of several basic types of test signal:
1. 0.7±7mV line bar, as the standard level;
2. 2T pulse: used to measure high frequency character of channel;
3. 10T or 20T pulse made up of a sine-squared luminance pulse and a chrominance packet with a sine-
squared envelope: used to measure Chrominance-Luminance Inequality character of a channel.
4. 5-step luminance staircase signal: used to measure Luminance nonlinear distortion of channel.
5. Luminance steps superimposed with modulated chrominance: used to measure chrominance
amplitude and phase distortion caused by luminance amplitude change of a channel.
6. Multiburst: used to measure the flatness of a channel in 6MHz video bandwidth.
GB19
Part III: Background and Concepts
NTC‐7 Composite
UK ITS1
107