TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
NOTE
Inasmuch as the bar pattern is composed of the H bar and V bar elements, it is not
necessary to provide a separate adjustment procedure for this pattern. The dot
pattern provides a small dot of brightness at the points on the display at which the
V bar and H bar elements intersect in the bar pattern, and therefore are located by
H bar and V bar adjustment.
(6) Adjustment of the vertical elements in the bar pattern is set by adjustment of the V bar pattern; refer to V
bar adjustment for proper control settings. Check that width and position control ranges continue to be
the same for the bar signal.
(7) Adjustment of the horizontal elements in the bar pattern is set by adjustment of the H bar pattern; refer
to H bar adjustment for proper control settings. Check that the width and position control ranges
continue to be the same for the bar signal.
(8) Observe the video portion of the signal while turning the VIDEO LEVEL control from 0 to 10. Video
amplitude should vary from 0.0v to l.0v peak-to-peak +0.10v. The sync and blanking portions of the
composite video signal should remain at the levels set in flat field adjustment
(9) Connect the video output connector to the monitor input to display the bar pattern. Trim the V bar
element size to match the H bar element size, if desired, using the control on the V bar card. (See para.
(10) Check that the pattern control is set on BLACK, black bars on a white background are obtained, and
when pattern control is set on WHITE, white bars on a black background are obtained.
(11) Performance verification of the bar function is now complete.
d.
Dot.
(1) All adjustments of the position and proportion of the dot pattern are determined by the adjustments
made to the bar pattern, for dots are generated at the intersection of the H and V elements in the bar
pattern. Dot size is adjustable as outlined under V bar adjustment.
(2) Set the function selector switch on DOT.
(3) Connect oscilloscope channel 1 input to the video output connector at the rear panel.
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