882 Video Test Instrument User Guide (Rev A.35) 591
GrayBar
Description 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.
Test Video color tracking (color monitors)
Purpose To verify that a color monitor accurately reproduces colors at all intensities.
Method 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.
Test Video gain linearity (monochrome monitors)
Purpose To check the video linearity (grayscale modulation)
Method Perform the Brightness Control Adjustment and Brightness Uniformity tests first.
Changes in brightness from bar to bar should be visible and uniform.
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