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Common faults of surveillance cameras

2011-10-26

1. Question: No image output from the camera?

a . Check whether the power supply is properly connected and whether the power supply voltage is sufficient;

b . Whether the BNC connector or video cable is in poor contact;

c . Whether the lens aperture is open;

d , whether the video or DC-driven automatic aperture lens control line is connected.

2. Question: The image quality of the camera is not good?

a . Whether the lens has fingerprints or is too dirty;

b , whether the aperture is adjusted properly;

c . Poor contact of the video cable;

d , whether there is any problem with the electronic shutter or white balance setting;

e . Whether the transmission distance is too far;

f , whether the voltage is normal;

g , whether there are interference sources nearby;

h . When installing in an elevator, ensure insulation with the elevator to avoid interference;

i , CS interface is connected.

3. Question: Why is the image distorted?

a , generally you can adjust the line synchronization of the monitor;

b , or interference.

4. Question: Why is the image whitish?

a . Check if the image circle is too large due to the lens circle adjustment;

b . After checking the camera, there is an automatic aperture brightness auxiliary adjustment potentiometer. Is the potentiometer adjusted too large?

c . Check whether the monitor is too large or malfunctioning.

5. Question: How many black vertical bars or horizontal bars appear on the screen?

a . In this case, the ripple of the output voltage of the power supply of the machine is generally too large . The filtering should be strengthened and a high-performance DC regulated power supply should be used.

6. Question: Why is the image blurry?

a , caused by poor focus of the camera and lens area;

b . Should the lens focus be adjusted first?

c . Check if the lens is a C or CS mount. If the C mount has to be attached, if it is a CS mount, remove the mount.

7. Question: Color distortion and color cast?

a . The white balance switch ( AWB ) may be improperly set, or the ambient lighting conditions may change too much. At this time, you should check whether the switch is set to the OFF position and try to improve the ambient lighting conditions.