Bosch EX65 Instruction Manual download pdf (Page 27)

28 en | Glossary EX65 Explosion-protected Illuminator

F.01U.162.949 | 1.0 | 2011.03 Instruction Manual Bosch Security Systems, Inc.

Field of View

The measure of the visible area within the camera’s field of view. The larger the focal length,

the smaller the field of view. The smaller the focal length, the wider the field of view.

Focal Length

The distance from the optical center of the lens to the image of an object located at an infinite

distance from the lens. Long focal lengths give a small field of view (e.g. telephoto effect),

while short focal lengths give a wide angle view.

Infrared Illumination

Electromagnetic radiation (light) with a longer wavelength than is visible to the human eye. IR

illumination is prominent at dusk and dawn and in incandescent lamps. IR illuminators come

in the form of lamps with the appropriate filters, LEDs, or lasers. CCD sensors are less

sensitive to IR than visible light, but IR can significantly increase the total illumination level,

leading to a much better image at low light levels.

IRE (Institute of Radio Engineers)

A measurement of video amplitude that divides the area from the bottom of sync to peak

white level into 140 equal units - 140 IRE equals 1V peak-to-peak. The range of active video is

100 IRE.

Lens wizard

The lens wizard is used when setting the backfocus. It opens the iris fully while maintaining

the correct video level using AES.

Lux

The international (SI) unit of measurement of the intensity of light. It is equal to the

illumination of a surface one meter away from a single candle.

OSD

On-screen Display: Menus are shown on the display monitor.

Privacy Masking

The ability to mask out a specific area to prevent it from being viewed in order to comply with

privacy laws and particular site requirements.

PWIE

Peak White Inverse Engine: White highlights are automatically turned black to reduce bright

spots. Useful in traffic and car park applications.

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Bosch EX65 Instruction Manual Page 27