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980 DP 1.4 Video Generator / Analyzer - User Guide Rev. A1
Page 483 June 16, 2017
16.161.3 Purpose
This general purpose pattern can be used to check the video handling capabilities of most parts of a television
system.
16.161.4 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.
16.161.5 Test
Color decoder performance.
16.161.6 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 page.
16.161.7 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.
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.
The following tests are based on the original SMPTE guideline:
16.161.8 Test
Visual chroma gain adjustment.
16.161.9 Method
To perform this test, you must have a way of turning off the red and green guns in the monitor under test. Turning
off the red and green video components of the 801GX generator
’s video output will not work for this test.
This test uses the upper and central color bars. Switch off the red and green guns on the monitor. This will produce
four blue bars, separated by black bars. Adjust the chroma gain so that the brightness of each outer blue bar is
uniform over the entire bar. The gain is correct when the bottom 10% of each bar is the same brightness as the rest
of the bar.
16.161.10 Test
Visual chroma phase adjustment.
16.161.11 Method