[ Huaqiang Security Network News ] Monitors sometimes have wood grain interference during the monitoring process. What is the reason? How to solve the wood grain interference problem, there are three reasons to solve the wood grain interference problem. 
1. The quality of the video transmission line is not good, especially the shielding performance is poor (the shielding network is not a good quality copper wire mesh, or the shielding mesh is too thin to prevent shielding). At the same time, the line resistance of such video lines is too large, which causes a large attenuation of the signal, which is also a cause of aggravation. In addition, the characteristic impedance of such video lines is not 75Ω and the parameter is out of specification is also one of the causes of failure. Since the above-mentioned interference phenomenon is not necessarily a failure caused by a bad video line, the cause of such a failure is accurate and prudent in judging. Only when the other possibilities are excluded can we consider from the perspective of the video line. If it is really a cable quality problem, the best way is to replace all of this cable and replace it with a cable that meets the requirements. This is the best way to solve the problem completely.
2. The power supply of the power supply system is not "clean". The power source referred to here is not "clean", which means that an interference signal is superimposed on a normal power source (a 50-sine sine wave). The interference signals on such power sources are mostly from devices using thyristors in the power grid. Especially for high-current, high-voltage thyristor equipment, the pollution of the power grid is very serious, which leads to the power supply in the same power grid is not "clean." For example, there are high-power thyristor frequency modulation speed regulation devices, thyristor rectifier devices, thyristor AC/DC converters, etc. in the power grid, which will pollute the power supply. The solution to this situation is relatively simple, as long as the entire system is powered by a clean power supply or an online UPS.
3. There is a strong source of interference near the system. This can be judged by investigation and understanding. If this is the case, the solution is to strengthen the shielding of the camera and ground the pipeline of the video cable.
2. The power supply of the power supply system is not "clean". The power source referred to here is not "clean", which means that an interference signal is superimposed on a normal power source (a 50-sine sine wave). The interference signals on such power sources are mostly from devices using thyristors in the power grid. Especially for high-current, high-voltage thyristor equipment, the pollution of the power grid is very serious, which leads to the power supply in the same power grid is not "clean." For example, there are high-power thyristor frequency modulation speed regulation devices, thyristor rectifier devices, thyristor AC/DC converters, etc. in the power grid, which will pollute the power supply. The solution to this situation is relatively simple, as long as the entire system is powered by a clean power supply or an online UPS.
3. There is a strong source of interference near the system. This can be judged by investigation and understanding. If this is the case, the solution is to strengthen the shielding of the camera and ground the pipeline of the video cable.
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