Quantum Data 881 User Manual page 980

Raster
Description
Test
Purpose
Method
Regulate
Description
Appendix B Image Reference
952
The primary version shows a totally black display (nothing being displayed). The
secondary version shows a totally white display.
Raster centering
Many monitor applications require that the displayed image or text fit completely within a
bezel that surrounds the CRT. This usually requires that you first center the blank raster on
the face of the CRT, and then center the image within the raster. Use this image for
centering the raster on the CRT.
Turn up your monitor's brightness control until the raster is just visible. Adjust the raster's
position and size using the size and raster centering controls. The raster centering
adjustment for many monochrome monitors consists of moving magnetic rings on the
deflection yoke.
The image cycles between two (2) patterns. In the primary version, the first pattern is a
white outline that defines the edges of displayed video. The other pattern has the same
outline plus a solid white rectangle in the center. The size of the solid rectangle equals
95% of the height and width of displayed video. The speed of the cycle cannot be
changed. The secondary version has a thick white frame with a black center for the first
pattern and a solid white active video area for the other pattern.