Quantum Data 802BT User Manual page 661

Video test generator

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Hatch_16, Hatch_20

802BT/802R Video Test Generator User Guide

Aspect Ratio

Convergence adjustment (color monitors only)

To accurately produce an image on a color monitor, the three electron beams in the CRT

must meet (converge) at the same location at the same time. Lines displayed on a

misconverged monitor appear as several multi-colored lines, and the transitions between

different colored areas contain fringes of other colors.

The convergence adjustments of most color monitors fall into two main categories. The

first set of adjustments, usually called Static Convergence, aligns the three beams in the

center of the display. This method involves turning on all three guns and adjusting the

various magnets on the convergence assembly to produce all white dots in the center of

the display. The convergence assembly is located on the neck of the CRT. Different

monitors and CRT types may each require their own magnet adjustment sequence.

After the center of the display is properly converged, the outer areas are adjusted by using

the monitor's Dynamic Convergence controls. The number of controls, the area of the

screen they affect, and their adjustment procedure depend on the monitor under test.

The primary version of the Hatch_16 image is shown below. The secondary versions draw

black lines on a white background.

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