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980 DP 1.4 Video Generator / Analyzer - User Guide
16.102
LinFocus
16.102.1
Description
This image has several parts. The first part consists of a large circle in the center of the screen. Its diameter equals
the lesser of the video height or width of the display.
The second part is a 10x10 box crosshatch. The crosshatch is drawn in from the outside edges, with any extra
pixels in the boxes placed along the vertical and horizontal axis. The vertical centerline is two pixels thick if the
format has an even number of active pixels per line. The horizontal centerline is two pixels thick if the format has an
even number of active lines per frame. A smaller box is added at the center of the image. The box is one-half the
height and two-fifths the width of one of the crosshatch boxes. Current format data is shown in the lower left
quadrant of the image. It shows the number of active pixels (H) and lines (V) as well as the vertical and horizontal
scan rates.
The primary version (shown below) consists of a white pattern on a black background. The secondary version has a
black pattern on a white background.
The image also includes blocks of focus-checking characters at various locations. The blocks are positioned inside
the crosshatch boxes and are up to 3x3 characters in size. The size of the blocks is limited by the number of
characters that can fit in one box.
16.102.2
Test
Linearity adjustment
16.102.3
Test
Focus adjustment.
16.102.4
Purpose
An out-of-focus monitor displays fuzzy graphic images and poorly formed, hard-to-read characters when text is
displayed on the screen.
Page 414
Rev. A1
June 16, 2017
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