American Dynamics ADCTDN0230P Uživatelský manuál stáhnout pdf

Chapter 1 - Cameras & Fixed Mini-Domes

CCTV Catalogue

Chapter 1 Page 1

08/08

Did You Know?

Did You Know Lux is the measurement of light and refers to levels of

illumination in any given area. The amount of light in specific areas

to be viewed should be given careful consideration when choosing

the right cameras for installation. It is worth noting that whilst the

table (right) gives indications of typical light levels it is recommend-

ed that a light meter is used to give accurate figures

Description Lux

British Summer Time 50,000

Overcast Sky 5,000

Well Lit Office 500

Minimum for Easy Reading 300

Passageway/Outside Working Light 50

Good Main Road Lighting 15

Sunset 10

Typical Side 5

Minimum Security Risk Lighting 2

Twilight 1

Clear Full Moon 0.3

Typical Moonlight/Cloudy Sky 0.01

Typical Starlight 0.001

Poor Starlight 0.0001

Explanation of Terms

Sensitivity (Lux)

Quantifies the camera's low-light performance.

Measured in Lux using a lens aperture of f1.2,

the value represents the minimum scene

illumination required by the camera to

produce a useable video output.

Resolution (TV Lines)

Describes the ability of the camera to discriminate

fine detail in a scene. The higher the number of

TV Lines, the better the resolution of the camera.

AI (Auto Iris)

Dedicated connector and reference signal for

Auto Iris lenses.

DD (Direct Drive)

Dedicated connector and circuitry for

Direct Drive lenses.

DD Level

Allows the lens drive level to be adjusted for DD

type lenses.

BLC (Backlight Compensation)

Automatically compensates for the silhouetting

effect of a backlit subject.

BLC Window (Back Light Comp.)

User selectable areas for BLC control.

EI (Electronic Iris)

Feature to automatically adjust shutter duration to

compensate for fluctuations in ambient light.

GAMMA

Improves grey/black discrimination at low light

levels.

AGC (Automatic Gain Control)

Automatically adjusts the camera's gain to

compensate for poor light conditions.

White Balance

Feature to preserve accurate white rendition under

different light source types.

Shutter

Analogous to the shutter in a standard 35mm film

camera. Can be used to freeze fast moving

subjects.

Flickerless mode

Feature to prevent the strobing effect under

certain lighting conditions/shutter speeds.

LL with Phase Adjust

Allows accurate synchronisation of multi-camera

installations by locking the camera to the AC

supply. The point on the AC cycle at which the

camera locks is adjustable by ±120

Internal Lock

Locks the camera's frame rate to its internal

oscillator.

Genlock

Allows multi-camera installations to be

synchronised to an externally generated

synchronisation signal.

S-Video Out

Provides a separated Y/C video signal.

Peak White Inversion

Feature that allows excessively white areas in a

scene to be rendered as black and therefore not

adversely affect the camera's exposure system.

PWI Threshold

Sets the level at which the Peak White Inversion

feature operates for white areas in the scene.

* Note: These features may be slightly different for other manufacturers.

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Strany 1 - Explanation of Terms

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