Data Sheet

Test conditions TSH80, TSH81, TSH82, TSH84
20/30 DocID009413 Rev 9
4.2 Video capabilities
To characterize the differential phase and differential gain, a CCIR330 video line is used.
The video line contains of five (flat) levels of luminance onto which the chrominance signal
is superimposed. The luminance gives various amplitudes which define the saturation of the
signal. The chrominance gives various phases which define the color of the signal.
Differential phase (or differential gain) distortion is present if a signal chrominance phase
(gain) is affected by the luminance level. The differential phase and gain represent the
ability to uniformly process the high frequency information at all luminance levels.
When a differential gain is present, color saturation is not correctly reproduced.
The input generator is the Rohde & Schwarz CCVS. The output measurement is made by
the Rohde and Schwarz VSA.
Figure 33. Measurement on Rohde and Schwarz VSA