Ultrak KC4500MN, Руководство по установке

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14
3.5 DC-TYPE AUTO-IRIS
LENS INSTALLATION
AND ADJUSTMENT,
continued
4.
Make sure that the EI switch located on the back of
the camera is set to OFF.
5.
Apply power to the camera.
6.
Adjust the dc-type auto-iris lens for an optimum
picture using the IRIS LEVEL control on the back of
the camera.
3.6 BACKFOCUS
ADJUSTMENT
Although the camera lens was backfocused by the
manufacturer prior to shipping, it may be necessary to
make modifications.
For best results, perform back focus adjustments at night
or while using a #6 or #8 welder’s glass in front of the
lens. The focus of the camera will change slightly if the
camera iris was adjusted on a light scene and then
changes to a dark scene. However, the camera will
remain in focus if the iris was focused on a dark scene
and the scene lightens.
To make backfocus adjustments, perform the following:
1. After mounting the lens on the camera, apply power.
2. Open the camera iris by turning the lens level control
counterclockwise.
3. If a picture is visible, focus on the scene. Open the
lens as wide as possible by placing a welder’s glass
in front of the lens.
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