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Dot_10, Dot_12, Dot_24
Description
Purpose
882 Video Test Instrument User Guide (Rev A.35)
The active video area is filled with multiple rows of white, single pixel dots. The dots define
the corners of what would appear to be square boxes if all connecting pixels were lit. The
number of rows of boxes and the number of boxes per row depends on which version of
the image is selected and the screen aspect ratio of the currently-loaded format. The
number in the image's name refers to the number of boxes that will be formed along the
minor axis for most aspect ratios. The generator calculates the ratio and then finds the
closest match from the following table.
Aspect Ratio
Dot_10
W : H
Decimal
Number
of Rows
16 : 9
1.777 É
10
5 : 3
1.666 É
10
4 : 3
1.333 É
10
1 : 1
1.000
10
3 : 4
0.750
14
The primary version has white pixel dots on a black background. A secondary version has
black pixel dots on a white background.
The primary version of the Dot_24 image is shown below.
To accurately produce an image on a color monitor, the three electron beams in the CRT
must meet (converge) at the same location at the same time. Small dots displayed on a
misconverged monitor appear as a group of multi-colored dots.
Dot_12
Boxes
Number
Boxes
per Row
of Rows
per Row
16
10
16
16
10
16
14
12
16
10
12
12
10
16
12
Dot_24
Number
Boxes
of Rows
per Row
18
32
18
30
24
32
24
24
32
24
893
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