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14
en | Configuration
4.5
Adjusting the Variable Field Illumination
4.5.1
Adjusting the LED Tilt Angle
You can orient the LED array tilted either up or down to maximize infrared coverage over the
field of view. On the rear of the camera housing is graphic for the LED tilt.
Figure 4.6 LED tilt scale
The "+" symbol indicates adjusting the LED tilt angle above the camera axis; and the "-"
symbol indicates adjusting the LED tilt angle below the camera axis.
As a general guideline, when the camera is pointed at a steeper angle down (usually at higher
installation heights or for shorter range applications), the LED tilt angle should be raised
above the camera axis to reduce the potential of overexposure in the foreground.
4.5.2
Adjusting the Illumination Beam Width
You can adjust the infrared beam width by adding or removing the 3D diffuser. The 3D diffuser
is recommended for wider field of view applications. With the 3D diffuser, a focal length of 6
mm provides a horizontal field of view of 43° to match the illumination pattern; the resulting
beam angle is 43° (H) x 10° (V). Without the 3D diffuser, a focal length of 27 mm (or greater)
provides a horizontal field of view of 10° (or less) to match the illumination pattern; the
resulting beam angle is 10° (H) x 10° (V). Each camera ships a 3D diffuser plate (already
installed in the camera.) and the 3D diffuser (not installed in the camera). When inserted, the
3D diffuser will be held in place by the diffuser plate.
To install the 3D diffuser:
1.
2.
3.
4.
F.01U.166.250 | 1.0 | 2011.04
Unscrew the four (4) captive screws beneath the illuminator in the front of the unit
(circled in Figure 4.7, below).
Figure 4.7 3D Diffuser (area circled)
Using the captive screws, remove the 3D diffuser plate.
Insert the 3D diffuser into the slit in the gasket on the 3D diffuser plate.
IMPORTANT: Ensure that the diffuser is inserted into the camera housing with the sticker
side facing the LED array. It is important that the diffuser is oriented with the sticker side
surface facing the LED array or IR performance will be lost.
Install the diffuser and plate assembly into the camera housing to secure and seal the
unit.
Quick Install Guide
NEI-30 | VEI-30 Dinion Infrared Imager
Bosch Security Systems, Inc.
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