Quantum Data 801GC, 801GF, 801GX manual Linearty, Linearity

Linearty	(Linearity)
Description	The image is made up of three parts. The first
	part consists of six (6) white circles. A large circle
	is drawn in the center of the screen. Its diameter
	equals the lesser of the video height or width of
	the display. A smaller circle is drawn at half the
	diameter and concentric with the larger circle. A
	circle also is drawn in each of the corners of the
	screen. The diameter of the corner circles equals
	one-fifth of the display width. The second part of
	the image consists of a white crosshatch image.
	The number of boxes in the crosshatch depends
	on the physical size of the display. The last part
	of the image consists of white tic marks on the
	horizontal and vertical center lines of the image.
	The marks are one pixel thick and at every other
	pixel location. Every fifth mark is slightly longer.
	The color of the pattern can be changed with the
	individual video output controls.

4-37