[ Huaqiang Security Network News ] 
The anti-interference ability of the camera is imperative. There are many common sources of interference in the monitoring project. We must fully understand the interference sources to solve the anti-interference fundamentally.
Power supply interference, when the system needs to be grounded at the beginning and the end at the same time, due to the different ground potentials at both ends and the presence of the cable sheath resistance, a ground potential difference of 50 Hz is caused between the two places, thereby generating an interference signal voltage. When the interference signal is superimposed on the video signal, a wide horizontal dark band or the like appears on the normal image.
Broadcast interference, when the cable is erected in the air, the cable itself is equivalent to a long antenna. As a result of the antenna effect, a considerable amount of broadcast interference voltage is generated in the cable, and an interference current is generated on the cable sheath. This current forms a loop through the grounding point at both ends of the cable and the ground, so that broadcast interference occurs at the terminal load. The voltage of the signal causes the interfering signal to mix into the video signal. This kind of interference signal appears as dense horizontal stripes, vertical stripes, twill, etc. on the image, and even floods the entire video image in severe cases.
Unclean power interference, such as high-power thyristor frequency modulation device, thyristor rectifier device, thyristor AC/DC converter, etc. in the power grid, will pollute the power supply. Unclean power sources can make cameras and other active devices unstable, creating interference.
Harmonic interference, harmonic interference mainly in the high current or high voltage around the power line, is the radiation signal to the surrounding power cable, its frequency is 2500Hz and 125000Hz, mainly interfere with the low frequency band of the video signal.
High-frequency interference, the lower the shielding effect of the cable shielding layer for the lower frequency signal, the high-frequency interference signal introduced for this reason is the carrier phone, the signal of the station, and the like. They cause horizontal streaks on the image.
Transmission line interference, video cable quality is not good, shielding performance is poor (shield layer is sparse or non-copper medium shielding layer, etc.), cable resistance is too large, and the video signal is seriously attenuated.
Through the understanding of the above sources of interference, the anti-interference force of the camera must also be improved, and Vaughan can take a variety of methods to solve.
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