TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
Table 3-1. Test Pattern Generator, Controls and Indicators
Control/indicator
Function
Function select
Selector switch which permits the operator to choose the following functions developed
(rotary)
in the video output signal:
H STRIPE
Nominally 50% of the vertical field at white level, 50% at black level for test of low frequency
response at field rate.
V STRIPE
Nominally 50% of each tv line at white level, 50% at black level, for test of transient and mid-
frequency response.
WINDOW
A 25% duty cycle test, combination of H STRIPE and V STRIPE, for combined transient and
FLAT FIELD
Uniform white level over entire active area.
GRAY SCALE
Standard ten step slope adjustable to linear or log.
RESOLUTION
Square wave bar pattern at selected repetition rate to develop desired "resolution tv lines", in
the ten increments (usually 100 to 1000 tv lines at 100 line steps), at full, 100% black-to-white
contrast. Presented as continuous, burst or multiburst. Reference bars also selectable over
entire tv field.
V BARS
Straight vertical lines accurately spaced to serve as a linearity reference in the horizontal
display plane.
BARS
A combination of the H BARS and V BARS to form a grid ("crosshatch" or "grating") for linearity
reference in both display planes simultaneously.
DOTS
Small pin points developed at the intersection of the H BAR and V BAR elements, especially for
linearity measurements with the EIA linearity (ball) chart.
H BARS
Straight horizontal lines accurately spaced to serve as a linearity reference in the vertical
display plane.
3-3