Extron • VTG 150 & VTG 200 • User’s ManualExtron • VTG 150 & VTG 200 • User’s Manual
Application Information
Page 4-8
Figure 4-8B VTG 150 TTL Crosshatch Test Pattern.
Figure 4-8A VTG 150 Apple/Mac ll Dot Test Pattern.
Application Information
Page 4-7
Figure 4-7A VTG 150 VGA/XGA Grayscale Test Pattern.
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.)