Suse Linux Professional 9.2 Upgrade [Strong Encryption 128 Bit] 00662644457260 User Manual
Product codes
00662644457260
Luminosity and contrast should be variable. The focus of the characters
should not differ with adjustments of brightness or contrast.
should not differ with adjustments of brightness or contrast.
The image should be free from distortion and show no color errors.
To avoid reflex glare, a good antireflective coating of the screen surface is
recommended.
recommended.
The screen should be rotatable and inclinable. A vertical adjustment is rec-
ommended.
ommended.
Colors make the displayed information easier to comprehend. However, the
display of colors can also be straining for the eyes because different colors
are refracted differently by the lenses. For red colors, people are farsighted,
but for blue colors people are nearsighted. Older screens often have con-
vergence errors — the three beams of the screen tube are no longer aligned
precisely, so colored borders appear around letters, for example.
display of colors can also be straining for the eyes because different colors
are refracted differently by the lenses. For red colors, people are farsighted,
but for blue colors people are nearsighted. Older screens often have con-
vergence errors — the three beams of the screen tube are no longer aligned
precisely, so colored borders appear around letters, for example.
Electromagnetic radiation emitting from the screen should be kept to a min-
imum.
imum.
22.2.2
Screen Location
A screen put in the wrong place leads to a cramped posture at work, which can
cause illnesses. A work table that has insufficient depth often prevents the screen
from being placed reasonably. The natural position of the head and arms is de-
signed for work that lies in front of the body.
cause illnesses. A work table that has insufficient depth often prevents the screen
from being placed reasonably. The natural position of the head and arms is de-
signed for work that lies in front of the body.
Ergonomics specialists have developed their own guidelines for the “vision and
gripping area.” These reject placing the screen to the side. An exception is only
when the screen is rarely used. A reason for this placement is the fact that even
the required minimum 80 cm worktable depth is insufficient with a large screen
and the use of working documents. Often the screen is placed — as shown in
many PC manual pictures — on top of the computer case. This also leads to an
unnatural posture. Observe yourself while you are reading. Are you looking
straight ahead or slightly down?
gripping area.” These reject placing the screen to the side. An exception is only
when the screen is rarely used. A reason for this placement is the fact that even
the required minimum 80 cm worktable depth is insufficient with a large screen
and the use of working documents. Often the screen is placed — as shown in
many PC manual pictures — on top of the computer case. This also leads to an
unnatural posture. Observe yourself while you are reading. Are you looking
straight ahead or slightly down?
Shoulder, keyboard, and screen should be in one line so you always look
directly at the screen. This rule does not necessarily need to be observed all
the time.
directly at the screen. This rule does not necessarily need to be observed all
the time.
288
22.2. Office Equipment