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GrayBar
Description
Test
Purpose
Method
Test
Purpose
Method
882 Video Test Instrument User Guide (Rev A.35)
The primary version (shown below) has 16 full-height vertical graybars. The intensity of
the bars is shown below. The secondary version splits the field into a top and bottom half.
The bars in the bottom half of the screen are in reverse order.
Video color tracking (color monitors)
To verify that a color monitor accurately reproduces colors at all intensities.
Perform the Brightness Control Adjustment and Brightness Uniformity tests first.
Changes in brightness from bar to bar should be uniform. All of the bars should appear as
an untinted gray at all levels.
Video gain linearity (monochrome monitors)
To check the video linearity (grayscale modulation)
Perform the Brightness Control Adjustment and Brightness Uniformity tests first.
Changes in brightness from bar to bar should be visible and uniform.
909
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