Quantum Data 802R Guide de l'utilisateur télécharger pdf (Page 632)

622 Appendix B Image Reference

Note: When outputting digital video, 33% Gray changes to 50% Gray, and 67% Gray

becomes either Black or some gray level depending on how the display interprets the video

information.

Test Verify that all video channels are functional

Purpose To verify that none of the video channels are bad or connected incorrectly.

Method Compare the sequence of color bars with the table. Missing bars may indicate a dead or

unconnected channel. The transition between the bars should be sharp and distinct. Each

bar should also be uniform in color and intensity across its entire width. Non-uniformity

may indicate problems with the response of the video amplifiers. If all the bars are present

but in the wrong order, one or more inputs may be swapped.

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Quantum Data 802R Guide de l'utilisateur Page 632