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4-40 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
LinFocus — contd.
The image also includes blocks of
focus-checking characters at
various locations. The blocks are
positioned inside the crosshatch
boxes and are up to 3 by 3
characters in size. The size of the
blocks is limited by the number of
characters that can fit in one box. The bit map of
a single focus character is shown here.
The primary version consists of a white pattern
on a black background. The secondary version has
a black pattern on a white background.
Test Linearity adjustment
Please see the discussion of the Linearity test image
for information on measuring linearity.
Test Focus adjustment(s)
Purpose An out-of-focus monitor displays fuzzy graphic
images and poorly formed, hard-to-read characters
when text is displayed on the screen.
Method 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 they affect depend
on the monitor you’re testing.
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