TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
H Stripe
The vertical component of the window signal presented for the full duration of the
horizontal television line will develop a horizontal stripe on the television display.
This will provide an approximate 50% duty cycle (APL), forming a field rate square
wave, ideal for clamp and dc restorer tests under typical operating conditions.
(13) Performance verification of the V stripe function is now complete.
b.
H Stripe.
(1) Set the oscilloscope sweep speed to 2 msec per division
(2) Connect oscilloscope external sync to the V drive source.
(3) Set function selector to H STRIPE, and pattern switch to WHITE.
(4) Compare oscilloscope display to figure 6-7b.
(5) The adjustment range allows the H stripe to be shifted as desired from top to bottom extremes which will
cut off part of the pattern at the top and on the bottom to an extreme which will cause the H stripe to be
developed in every other field resulting in a striped flickering effect rather than the normal display. This
pattern should be adjusted so that the entire pattern is shown in the center of the raster.
(6) Adjust the top margin (left on oscilloscope display) to 25% of the active raster (3.85 msec +0.25 msec)
using the V position control (R56) located on the V WINDOW card (figure 6-20).
(7) Adjust the vertical component (center area) of the H stripe pattern to 7.7 msec +0.5 msec using the V
width control (R57) located on the V WINDOW card.
(8) The width of the bottom margin should be the same as the top margin, 25% of the active raster (3.85
msec +0.25 msec)
(9) Set pattern switch to BLACK, and compare oscilloscope display to figure 6-19b. Return pattern switch to
WHITE.
(10) 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 1.0v peak-to-peak +0.10v. The sync and blanking portions of the
composite video signal should remain at the levels set in signal level adjustments (paragraph 6-38).
6-50
