882 Video Test Instrument User Guide (Rev A.35) 571
CirclesS
Description Special test image developed per customer specifications. In the primary version (shown
below), the image consists of eight small white circles on a black background. The circles
are positioned in the corners of the active video area and centered on each edge of the
active video area. The secondary version inverts the image to black circles on a white
background.
Purpose This pattern is specified by some monitor manufacturers for checking and adjusting video
scan size, linearity, and over scanning.
ColorBar
Description The primary version (shown below) has 16 full-height vertical color bars. The secondary
version splits the field into a top and bottom half. The bars in the bottom half of the screen
are in reverse order.
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