Teledyne 980 DP1.4, User Manual, Page: 500 / 507

980 DP 1.4 Video Generator / Analyzer - User Guide Rev. A1
Page 500 June 16, 2017
16.176.5 Test
Convergence adjustment.
16.176.6 Purpose
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. Lines displayed on a mis-converged monitor will appear as several
multi-colored lines, and the transitions between different colored areas will contain
“fringes” of other colors.
16.176.7 Method
The convergence adjustments of most color monitors can be divided 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.
This method involves turning on all three guns and adjusting 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.
After the center of the display is properly converged, the outer areas can be adjusted by using the monitor
’s
“Dynamic Convergence” controls. The number of controls, the area of the screen that they affect and their
adjustment procedure is dependent upon the monitor under test.
16.176.8 Test
Sweep linearity adjustment.