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980 DP 1.4 Video Generator / Analyzer - User Guide
Rev. A1
16.26 CheckBy3
16.26.1Description
The active video area is equally divided into a 3x3 checkerboard of black and white boxes.
The primary version has four white boxes as shown in the image below. The secondary version has five white
boxes (reverse).
16.26.2Test
Contrast ratio.
16.26.3Purpose
The pattern is based on a proposed ANSI method of measuring the contrast ratio of video projection systems.
Method Using a light meter probe, measure and record the light-level reading (in foot lamberts) in the center of
each of the black and white boxes. The contrast ratio is expressed as the average of all of the white readings
divided by the average of all of the black readings.
Page 334
June 16, 2017
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