Quantum Data 700A - Manual (Page 22)

22 Model 700A, 701A Quick Start Guide
Regulate
Description - The image has a pair of white outlined boxes which surround a blinking solid white box.
Application - Tests for proper high voltage regulation.
Checker
Description - The image’s active video area is equally divided into a 6x6 checkerboard of black and
white boxes.
Application - The pattern is based on a proposed ANSI method of measuring the contrast ratio of
video projection systems.
Dot_12
Description - The image’s 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.
Application - Used to measure convergence. 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.
SMPTEBar
Description - The image’s upper 67% of the image consists of a series of color bars. These bars
match the order of the bars in the SMPTE and EIA patterns.
The left side of the lower 25% of the image contains isolated -I and Q color difference signals that
match the original EIA and SMPTE patterns. The -I signal appears as a bluish-gray bar and the Q
signal appears as a purple bar on a TV monitor. The bars are separated by a white (+100 IRE) bar.
After the Q blocks there are four blocks: black, (black - 4 IRE), black, (black + 4IRE).
The right side of the lower 25% of the image contains a narrow 12.5 IRE gray bar.
Application - Designed for adjusting the color settings of a television monitor by eye. It can also be
used with a TV waveform analyzer and vectorscope for testing video signal processors and color
decoders.
Pattern Descriptions