Installation Manual for DiBos Video System
A5/11–2004610–4.998.137.176 – 135 –
Maintenance and Service (continued)
9.4 Troubleshooting
The following faults have to be rectified if necessary:
Counter light
If recordings show impairment due to counter light, either block out
the light source, e.g. through curtains on windows or shades on
lights, or change the location of the camera.
Reflections
If the optical room surveillance system is installed inside special
glazing to hinder bullets or break–in attempts, the lighting may pro-
duce unfavorable reflections. These are stronger as the intensity of
the light inside the glazing becomes higher. Reflections of this kind
can be reduced if the area outside the glazing is lit better and the
cameras are positioned nearer to the glazing. Reflections can often
be avoided by darkening light sources behind or next to the camera.
If these measures do not help matters, a polarizing filter can be
placed in front of the lens.
Focus
When checking the recordings, make sure that persons and objects
inside the area of surveillance are in good focus.
The gray or ND filter can be used in front of the lens to improve the
focus.
Dirt
The quality of recordings is often impaired by dirt on the lens or the
screen of the enclosure.
Functional interference can often be eliminated by:
1. Disconnecting and reestablishing the local or remote
connection in the video system program
2. Exiting the program followed by a restart
or
3. A warm start or switching the system off and back on
(waiting approximately 20 s in between)
If this does not result in normal operation, check the programming.
If the fault cannot be rectified, the system must be replaced.