User manual

First installation 55
White uniformity settings (on color displays only)
The white uniformity adjustments compensate for the effect of disturbing
magnetic fields on color displays. These magnetic fields cause color purity
or white uniformity errors. The most common is distortion due to the
earth magnetic field.
Vertical uniformity
This adjustment is especially necessary when the display is operating in
the southern hemisphere or near the equator. Adjust to remove purity or
uniformity errors, especially in the center of the image.
Note: After each change of vertical uniformity, you might notice the
image gets a slight “shiver”. This is due to the degauss, which is done
after each change in this setting.
Axial uniformity
This adjustment compensates mostly around the edges of the image. As a
side effect, the image rotates because of the adjustment. You can
compensate this by means of the Rotation deviation adjustment
(Horizontal geometry).
2.7 Defining Presets
Introduction
For each display in the configuration, you must define a Preset.
The Preset is very important in the Q/A concept. In a preset you define
the display’s reference for visual behavior. With this reference, we want
the display to be conform.
The Q/A tasks will use this reference to determine whether or not the
displays are still performing OK.
A preset completely defines the display’s required visual behavior, based
on essential parameters (see below). For each parameter you can enter a
target value and 2 levels of tolerance.
These parameters are:
• White luminance:
The required luminance for a white image.
• Black luminance:
The required luminance for a black image.