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4-50 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
QuartBox
Description The primary version has a single white box in the
center of active video. The size of the box is one-
half the width and height of the active video area
(a quarter of the entire active video area). The
secondary version draws a black box on a white
background.
Test Brightness control adjustment
Purpose The wrong brightness setting on your monitor may
cause other tests such as Contrast, Focus and Beam
Size to be invalid. An accurate brightness setting
helps give repeatable measurements throughout
other tests. This version of the brightness box
should be used if the display’s specifications call
for the brightness to be set with one-fourth of the
screen lit.
Method Place your light meter probe within the center box
and adjust the monitor’s brightness control to
obtain the required light meter reading.