来源：http://www.vranime.net/ 点击?#38382;?span id="hits"> 发布时间：2018-01-18
Lighting electrical voltages by the general security service company is 220V, and the operating voltage, many factories are equipped to reach 380V, if the lighting wire line wiring together with the video, the impact is relatively small, generally not what big problem; however, if the wire together with 380V wiring, video signal will be severely disturbed, even if is the 380V such an environment, the signal also can be disturbed, mainly because the strong magnetic field is too large, the signal line simply could not withstand such a disturbed magnetic field. Then, in the Shandong security service company to do the project process, and don't remember together to try to prevent electrical wiring, line through this environment, must pass expired, should also do homework shielding lines and to adhere to certain intervals to ensure the quality of our project. In the case of disturbing, we can use the anti-interference device, but the effect is not very obvious, the best way is to keep away from the strong power.
So how do security services deal with the interference between video line and strong power?
1. there is interference - is there any interference to see the front end camera output? If not, the interference is from the line coupling, which is true interference. If the front camera output is jammed, the camera or the power supply is removed, which is false interference.
2. there is no interference with the independent monitor, indicating that there is no interference in the output of the camera and there is no interference from the line. However, there is interference on the host's view. It must be false jamming. Most of them are "multi point grounding". The correct plan is that the system can only connect the main engine to the ground, and all the cameras and power sources at the front end should be insulated from the earth. There is no need to resist the interference device, and do not have to change the transmission method, it is handled, and more important is the elimination of "security risks";
3., the real interference of the line will not be particularly fierce. It can basically see the picture, and it can be processed with the anti-jamming device. If the interference is serious, it can hardly see the picture, mostly the fake jamming.
On the problem of coaxial interference:
1. the conventional meaning of electromagnetic interference refers to the cable as the acceptance of the "antenna", the acceptance of the space electromagnetic interference. It has been proved that the engineering practice in recent years, the video baseband transmission (0~6M), electromagnetic interference is common, anti-jamming device to a weighted processing;
2. engineering interference phenomenon, touched many elements, the equipment failure can also occur interference phenomena, such as camera, camera power supply fault fault etc., can cause trouble phenomenon, although many people regard it as troubling to discuss, but this is due to the hair cleaning equipment problems, troubleshooting, trouble is dealt with this is, in essence, subjective elements form; also, grounding multi-point video system, which is in the planning and construction of the "artificially formed potential" the introduction of video system interference, is also attributed to the formation of the concept of elements, single point grounding on the deal, and so on; this kind of all of us it is classified as "wrong kind of trouble -- false trouble.
3. really can interference, "defense" (such as wearing a galvanized iron pipe) can "escape", (with cable or radio), can also be "anti" (anti interference device); false interference problems -- to subjective elements, only from the heap to improve the level of planning and construction experience to handle. Anti disturb, which can handle real disturbance, but it can not replace your equipment fault and correct your planning and construction fault.
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