Extron electronic VTG 200 Monitor Applications, 8AVTG 150 Apple/Mac ll Dot Test Pattern

Application Information

Monitor Applications

The VTG can be used in a variety of monitor testing and adjustment applications using the 16 available test patterns. Following is a brief summary of some of the uses in these types of applications.

•Color convergence or registration can be done using any of the crosshatch or dot patterns. (See figures 4-8A & 4-8B.)

•Focusing can be adjusted using several of the test patterns including the dot pattern, crosshatch, H pattern white on black, and other patterns with single pixel lines.

•The 3 checkerboard patterns can be used to check color tracking of video amplifiers, adjust raster cutoff levels, evaluate video amplifier clamp stability and CRT high voltage regulation.

•Common uses for the VTG color bar patterns on TTL monitors, include testing TTL-to-analog converters and checking true brown correction in the 8-color mode.

•The alternating pixel patterns can be used for: display resolution check, video bandwidth performance, and EMI radiation testing.

•Grayscale can be checked and adjusted on monochrome monitors using the 8-level split grayscale pattern. Contrast linearity, from low to high level, can also be checked and adjusted. Each gray and color level represents a 14.3% change in luminance level. (See figure 4-7A.)

Application Information

Figure 4-8AVTG 150 Apple/Mac ll Dot Test Pattern.

Figure 4-8BVTG 150 TTL Crosshatch Test Pattern.

Figure 4-7AVTG 150 VGA/XGA Grayscale Test Pattern.

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