Quantum Data 802BT User Manual page 624

Video test generator

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Appendix B Image Reference

The primary version has a single white box in the center of active video. The box size is

controlled by the MSIZ system parameter. The secondary version adds four boxes in the

corners of active video.

Brightness control adjustment

The wrong brightness setting 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.

Center your light meter probe within the center square and adjust the monitor's brightness

control to obtain the required light meter reading.

Brightness uniformity

The light output of most picture tubes varies slightly when measured across the CRT face.

This test can be used to verify that the light output variation is within your specification

Select the inverted version and perform the Brightness Control Adjustment test on the

center box. Then, center the light meter probe in each of the corner squares and note the

reading you get for each square. The deviation between each of the corner readings and

the center reading should be within your specification limits.

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