Bosch LTC 3283/20 Installationshandbuch Seite 4

Video-iris Zoom Lenses | Installation Instructions
Auto-iris Connection: A 200 mm cable terminated with a 4-pin EIAJ
plug.
Zoom and Focus Connection: A 400 mm cable terminated with 8-pin
connector.
Lens Mounting:
To attach the lens to the camera:
1. Screw the lens clockwise into the camera until it completely stops.
2. Rotate the lens anticlockwise to the desired position (the friction
coupling between the mount and the lens body allows 330° rotation).
Controls
Zoom and Focus Control
Zoom and focus are controlled by voltages supplied from the zoom/focus
controller, via the zoom/focus connection cable. The zoom and focus
motors are activated while the voltages are applied and stop when the
voltages are removed.
Automatic Light-Level Control (ALC)
The ALC potentiometer can be set to "Av" (average) for more detail in the
darker parts of the scene or to "Pk" (peak) for more detail in the brighter
parts of the scene. The normal setting is the mid-position.
Level
The "Level" potentiometer sets the exposure and operating level of the
lens/camera combination. If the level setting is too high (iris open too far),
some parts or the scene become over-exposed (white). If the level setting is
too low (iris closed too far), the picture has little contrast and is noisy and
grainy.
Bosch Security Systems | 2004-01
EN | 2