4-73
TVHatch
(TV formats only)
Description:
The image consists of a white crosshatch on a black
background. The lines form square boxes when the
display’s active video area has a 4:3 aspect ratio.
The vertical lines are made using sine-squared (2T)
pulses (T = 125 nSec for NTSC and T = 100 nSec for
PAL).
Test:
Convergence Adjustment
Purpose:
In order to accurately produce an image on a color
monitor, the three electron beams in the CRT must
meet (converge) at the exact same location at the
same time. Lines displayed on a mis-converged
monitor will appear as several multicolored lines
and the transitions between different colored areas
will contain “fringes” of other colors.
Method:
The convergence adjustments of most color monitors
can be broken down into two main categories.
The first set of adjustments, usually called “Static
Convergence”, calls for aligning the three beams in
the center of the display. The idea is to turn on all
three guns and adjust the various magnets on the
convergence assembly to produce all white lines and
dots in the center of the display. The convergence
assembly is located on the neck of the CRT. Different
monitors and CRT types may each require their own
magnet adjustment sequence.
Summary of Contents for 801GC, 801GF, 801GX
Page 1: ...Owner s and Programmer s Manual Model 801GC 801GF 801GX Portable Video Signal Generators ...
Page 16: ...xiv Table of Contents Models 801GC 801GF 801GX Rev A Notes ...
Page 17: ...1 1 Features Product Overview Chapter 1 Introduction ...
Page 21: ...2 1 Operating Modes Displays Indicators Knobs Switches Buttons Chapter 2 Basic Operation ...
Page 31: ...3 1 Introduction Format charts Chapter 3 Built In Formats ...
Page 39: ...4 1 Description of the test images and how to use them Chapter 4 Built In Images ...
Page 126: ...5 14 Chapter 5 Making Connections Model 801GC 801GF 801GX Rev A Notes ...
Page 304: ...6 178 Chapter 6 Programming Model 801GC 801GF 801GX Rev A Notes ...
Page 305: ...7 1 Power on Computer Interfacing If all else fails Chapter 7 Troubleshooting ...
Page 346: ...A 6 Appendix A Specifications Model 801GC 801GF 801GX Rev A Notes ...
Page 355: ...Notes ...