Sony SSC-C108P 매뉴얼 - 페이지 21

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페이지 인쇄

Monitor Size

9˝

12˝

17˝

21˝

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.

For more information contact the Sony Business Information Centre: 01932 816340

Typical Viewing Distance

5´

10´

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

15´

and tilted for viewing

from different angles.

Which Monitor?