What is the cause of black spots on the surveillance camera?

[ Pacific Security Network News ]
When the surveillance camera is installed and used, it often encounters some faults, such as no image, unclear image, focal length, etc. Some of these problems are caused by the camera itself, and some are caused by improper installation and use. This paper focuses on the surveillance camera. There are black map solutions for your reference.

What is the cause of black spots on the surveillance camera?
1, camera status: bad transformer
Analysis of the cause: the power supply is unstable and the noise is too large.
Solution: Replace the transformer
2, camera status: bad line
Cause analysis: too many connectors or poor line contact
Solution: Replace the line
3, camera status: a number of vertical strip interference with equal spacing
Analysis of the cause: Since the characteristic impedance of the video transmission line is not 75Ω, it causes impedance mismatch. Or caused by the inconsistency of the characteristic impedance and distribution parameters of the video cable.
Solution: Generally, it is solved by the method of “starting series resistor” or “terminal paralleling resistor”.
4, the camera status: the appearance of wood-like interference
Analysis of the cause: The quality of the video transmission line is not good, especially the shielding performance is poor, and the line resistance is too large, thus causing a large attenuation of the signal. Or because the power supply of the power supply system is not "clean".

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