Common Faults Of Surveillance Cameras

1. The infrared hemisphere series machine has poor image illumination, whitishness or bright white aperture at night.

This phenomenon is caused by improper assembly of the machine. When the photosensitive device (photoresistor) is too far away from the hemisphere during assembly, the infrared light will not be fully activated, resulting in poor night illumination of the machine; the phenomenon of image whitening or bright white aperture is mainly caused by the infrared light emitting tube. The infrared light is refracted to the lens through the dome cover. The solution to this phenomenon is to avoid the infrared light being refracted to the surface of the lens. Usually, a sponge ring is used to isolate the lens from the infrared light. The dome cover must be tightly attached to the sponge ring during assembly.

2. The image of the night vision infrared waterproof machine is normal during the day, but turns white at night

This phenomenon is generally caused by reflections in the environment where the machine is used or used in a small space. It is caused by reflection of infrared light. To solve this phenomenon, first determine whether there are reflectors in the environment of use, improve the environment as much as possible, and then check the effective infrared light of the machine. Whether the distance corresponds to the actual use distance; if a long-distance infrared machine is used in a small space, the machine image will be white due to excessive infrared light.

3. No image

First, check whether the polarity of the external power supply is correct and whether the output voltage meets the requirements (power error: DC12V±10%, AC24V±5%), and then check whether the video connection is in good contact; if using a manual aperture lens, check whether the aperture is open, and the automatic The aperture lens needs to adjust the LEVEL potentiometer to make the aperture in the proper position.

4. Color distortion and color cast

It may be that the white balance switch (AWB) is not set properly, or the ambient light conditions have changed too much. At this time, you should check whether the switch setting is in the OFF position, and you should find a way to improve the ambient light conditions.

5. The image is distorted or geometrically distorted

This phenomenon may be a problem with the geometric correction circuit of the camera or monitor or a problem with the optical lens, or it may be that the characteristic impedance of the video connection cable or device does not match the output impedance of the camera. When the above phenomenon occurs, please check whether the optical lens used is abnormal and whether the input impedance switch of the monitor is set to 75Ω, and then check whether the impedance of the video connection cable is 75Ω.