Quantum Data 881 User Manual page 1023

Focus_@6, Focus_@7, Focus_@8, Focus_@9
Description
Test
Purpose
Method
882 Video Test Instrument User Guide (Rev A.35)
In the primary versions, the screen is filled with white "@" characters on a black
background. The secondary versions are drawn with black characters on a white
background. The primary version of the Focus_@6 image is shown below.
Focus adjustments
An out-of-focus monitor displays fuzzy graphic images and poorly formed, hard-to-read
text characters.
On monitors with a single (static) focus adjustment, adjust the control for the best average
focus over the entire screen. The focus at certain locations of the screen should be within
specified limits.
Some monitors have a static and one or more dynamic focus controls. The sequence for
adjusting them and the areas of the screen that they affect depend on the monitor under
test.
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