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8.3 Troubleshooting Problems
Video not displayed on monitor
If the camera will not produce an image, check the video connection at the camera and at your
display. If the connectors appear to be properly engaged but the camera still does not produce
an image, ensure that power has been properly applied to the camera and the fuse is not blown.
If the camera still does not produce an image, have an authorized service representative make
the appropriate repairs.
Noisy image
A noisy image is usually attributed to a cable problem (too short or inferior quality) or the cable
is picking up electromagnetic interference (EMI) from another device. Although coax cable has
built-in losses, the longer and smaller the cable is, the more severe the losses become; and the
higher the signal frequency, the more pronounced the losses. Unfortunately this is one of the
most common and unnecessary problems currently plaguing video security systems as a whole.
Cable characteristics are determined by a number of factors (core material, dielectric material
and shield construction, among others) and must be carefully matched to the specific
application. Moreover, the transmission characteristics of the cable will be influenced by the
physical environment through which the cable is run and the method of installation. Use only
high quality cable and be careful to match the cable to the environment (indoor or outdoor).
Image out of focus
The SR-100 and SR-100P have an electronically controlled focus mechanism for use during
ongoing operation. This focus mechanism is controlled through the serial interface.
The VSR-6, SR-19, SR-35, and SR-50 camera systems each have a fixed-focus lens (focused
at infinity at the factory) and the lens focus is not field adjustable.
Each camera has a minimum focus distance, as listed in the specifications section (0
SR-Series
Camera
Specifications). An out-of-focus object may be too close to the camera and within th
e
minimum focus distance.
Image too dark or too light
By default the SR-Series cameras use an Automatic Gain Control (AGC) setting that has proven
to be superior for most applications, but a particular installation may require an adjustment to
the AGC settings. For example, a very cold background (such as the sky) could cause the
camera to use a wider range than appropriate. Refer to section 7.2
Configuration and Control
for information about how to make adjustments to the image generated by the camera.
Performance varies with time of day
You may observe differences in the way the camera performs at different times of the day, due
to the diurnal cycle of the sun. Recall that the camera produces an image based on temperature
differences. At certain times of the day, such as just before dawn, the objects in the image
scene may all be roughly the same temperature, compared to other times of the day. Compare
this to imagery right after sunset, when objects in the image may be radiating heat energy that
has been absorbed during the day due to solar loading. Greater temperature differences in the
scene generally will allow the camera to produce high-contrast imagery.
427-0014-00-10 Revision 150
Copyright © 2007 FLIR Systems, Inc.
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