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4-70 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
TVBar100 & TVBar_75 (TV formats only)
Description: The image consists of seven (7) vertical bars that fill
the entire active video area. The color and order of
the bars is shown in the figure below. The TVBar100
image has a peak video level of 100 IRE and the
TVBar_75 image has a peak video level of 75 IRE.
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 colors 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. Indivdual
scan lines of each image, as they would appear on
a waveform analyzer, are shown on the following
page.
The image is quite effective when used with a TV
vectorscope to see how a video system handles an
encoded color signal. Vectorscope signatures of both
NTSC and PAL versions of the image can be found
on the following pages.
Gray
Yellow
Cyan
Green
Magenta
Red
Blue
Black