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4-64 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
Test: Color Video Performance
Purpose: This general purpose pattern can be used to check
the video handling capabilities of most parts of a
television system.
Method: When viewed on a TV screen, all of the upper color
bars should be correct and in the order shown. The
hue and intensity of each bar should be uniform
over the entire bar.
The image can be used with a TV waveform analyzer
to check the performance of a video system. The
upper color bars, as they would appear on a waveform
analyzer, are shown on a previous page.
Test: Color Decoder Performance
Purpose: The image can used with a TV vectorscope to check
for proper operation of a video color decoder.
Vectorscope signatures of the upper and lower
portions of the image using NTSC encoding can be
found on the previous pages.
Method: The vectorscope signature for the color bars should
hit the target test point for each color on the
vectorscope’s graticule. If you are using PAL encoded
video, the signature will be similar to the one shown
for the TVBar_75 test image on an earlier page.
The three “legs” of the vectorscope signature for
the -I and Q color difference signals should match
the Burst, -I and Q reference lines on the vectorscope’s
graticule.