4.
There are two basic models of the color bar generator.
The first is a
compact, lightweight generator instrument used primarily where portability is
desired.
The second mounts in a standard 19-inch rack, and is used primarily in
the television broadcast system.
In both units the operation is about the same,
and the desired outputs serve the same basic purpose.
a. With its variety of test signals, the color bar generator is an excellent
tool for use in analyzing television system defects or anomalies.
The following
paragraphs list the color bar generator test signals and their general applications.
(1) The standard full field color bar signal consists of eight equal
intervals arranged in descending order of luminance as follows: gray, yellow, cyan,
green, magenta, red, blue, and black (fig 3-29). This signal is used for checking
luminance, hue, and saturation parameters of the television system.
(2) Split field Y reference signal provides standard color bars in the
first part of the test pattern display and luminance-only shades of gray to black
in the second part (fig 3-30).
The split field Y reference signal is especially
useful for checking color balance and tracking of color picture monitors.
Figure 3-29.
Full field color bars
Figure 3-30.
Split field Y Reference
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