HP 8591C User Manual page 288

Inequality Test
Description
Non-standard timing between the 2T and 12.5T pulses will return values that
are offset by up to 25 ns. The 'IT" in NTSC systems is 125 ns. A 2T pulse
has a half amplitude duration of 250 ns for NTSC; 12.5T pulse has a half
amplitude duration of 1.5625 ps.
The 'chromakuna delay inequality test measures the time delay between the
low frequency luminance component and the high frequency chrominance
component of the 12.5T modulated pulse in the composite test signal. Refer
to Figure 8-14.
Color Test Descriptions (Chromajluma Delay Inequality, Differential Gain, Differential Phase)
N O T E
The analyzer internal frequency calibration routine should be done at the temperature the test will be
performed for best accuracy
CHRNNEL
REF 26.46 I'J
E
P A C K T
LIN
REF
DIFFERENTIAL
DIFFERENTIAL
Figure g-14. Chrominance-to-Luminance Delay
AT i0 dB
OIF GAIN PHASE
-1.30
GAIN
PHASE
packet: NO)
Test Descriptions
MENU
8-35