What causes the images of infrared cameras and ordinary cameras to appear black and white stripes and scroll up and down?

The image has a black and white bar, scrolling up and down 1. Reason and Judgment On the monitor screen, a black bar or white bar appears and slowly scrolls up or down. The reason for this phenomenon is mostly due to the interference of 50Hz alternating current caused by the grounding circuit in the system. However, sometimes, due to the poor performance or local damage of the power supply of the control host such as camera or matrix switcher, or the grounding of the system and equipment, this kind of fault phenomenon will also occur. Therefore, when analyzing this fault phenomenon, we should first distinguish two different fault causes. In order to distinguish the power problem from the ground loop problem, generally speaking, the output signal of the camera without power problem is connected to the control host. If the above phenomenon does not appear on the monitor, there is no problem with the control host. Next, you can connect a portable monitor to the video output end of the nearby front-end camera, and check the cameras one by one to see if any cameras are disturbed by power problems. If there is, deal with it; If not, the interference is caused by other reasons such as grounding circuit. 2. The reason caused by the power supply problem or grounding problem between the system and the equipment. The power supply voltage of video equipment, especially the camera, is too low, or the power supply is not "clean", the ripple coefficient is relatively large, or there is relatively large interference in series; Poor grounding of the system or equipment; Video equipment such as video camera or video amplifier or video matrix has quality problems; There are serious electromagnetic interferences around the system, such as electric welding, radio transmission, interference between large motors and large relays, etc.

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