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CCTV monitors may be
free standing,
suspended from a wall
or ceiling, or rack
mounted. Wall and
ceiling mounts allow the
monitor to be rotated
and tilted for viewing
from different angles.
Monitor costs
Why does a 17-inch black and white CCTV monitor cost more than the equivalent
black and white TV? The answer is that the CCTV monitor has specialist features
and characteristics. For example, the average TV set has around 300 lines of
resolution while the CCTV monitor would normally have over 700 lines. The CCTV
monitor also has regulated power supply to maintain performance during power
fluctuations, an isolation transformer and a fast acting automatic frequency control
(AFC) loop to reduce radio frequency interference.
Colour monitors
Colour monitors are also available in a similar range of sizes. These monitors
usually accept only composite colour signals, although where very high quality
images are required, monitors with a Y/C (luminance and chrominance) input
should be used.
Two principal types of colour CRTs are currently in use: the shadow mask CRT
and the Trinitron. The face of the shadow mask type is based on the shape of a
sphere, whereas the Trinitron is based on
the shape of a cylinder.This means that
the Trinitron is curved only in the horizontal
plane providing an image which is more
geometrically accurate and which reduces
operator eye-fatigue caused by reflected
light from above. Close examination of the
shadow mask CRT reveals how the image
is constructed from dots or ellipsoids
whereas the Trinitron images consist of
continuous stripes resulting in a cleaner
and more stable image.
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For more information contact the Sony Business Information Centre: 01932 816340
Which Monitor?
Monitor Size
9˝
12˝
17˝
21˝
Typical Viewing Distance
5´ 10´ 15´