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4-74 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
After the center of the display is properly converged,
the outer areas can be adjusted by using the monitor’s
“Dynamic Convergence” controls. The number of
controls, the area of the screen that they affect and
their adjustment procedure is dependent upon the
monitor you’re testing.
Test: Sweep Linearity Adjustment
Purpose: In order to present an undistorted display, the
horizontal and vertical sweeps of the electron beam
across the face of the CRT should be at uniform
speeds. Any non-uniformity in the sweep will cause
portions of an image to be stretched while other
portions will be compressed. Non-linearity in a
monitor can show up in several ways. It may be
present across the entire screen, a large portion of
the screen or it may be localized in a very small
area.
Method: Adjust the display’s linearity controls so that all of
the boxes in the crosshatch are identical in size. You
can measure the boxes with a ruler or with a gauge
made for the monitor you’re testing. Any deviation
should be within your spec limits.