Quantum Data 802R Guide de l'utilisateur télécharger pdf (Page 706)

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696 Appendix B Image Reference

Test Visual chroma gain adjustment

Method To perform this test, you must have a way of turning off the red and green guns in the

monitor under test. Turning off the red and green video components of the 801GX

generator’s video output will not work for this test.

This test uses the upper and central color bars. Switch off the red and green guns on the

monitor. This will produce four blue bars, separated by black bars. Adjust the chroma gain

so that the brightness of each outer blue bar is uniform over the entire bar. The gain is

correct when the bottom 10% of each bar is the same brightness as the rest of the bar.

Test Visual chroma phase adjustment

Method In order to perform this test, you must have a way of turning off the red and green guns in

the monitor under test. Turning off the red and green video components of the 801GX

generator’s video output will not work for this test.

This test uses the upper and central color bars. Switch off the red and green guns on the

monitor. This will produce four blue bars, separated by black bars. Adjust the chroma

phase so that the brightness of each of the two central blue bars is uniform over the entire

bar. The phase is correct when the bottom 10% of each bar is the same brightness as the

rest of the bar.

Test Visual black level adjustment

Method This test uses the lower right hand portion of the image. Reduce the black level until the

gray bar disappears. Slowly increase the black level until the bar just becomes clearly

visible.

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Quantum Data 802R Guide de l'utilisateur Page 706

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