How to solve the interference between video line and strong power

Strong electricity, that is, 380V or above. Generally, the voltage of the lighting used by us is 220V, and the operating voltage of equipment in many factories reaches 380V. If the wiring for lighting is wired with the video cable, the impact is relatively small, and generally there is no major problem; however, if it is connected with 380V wire When wiring together, the video signal will be seriously interfered. Even in an environment such as 380V, the signal will be disturbed, mainly because the magnetic field of the strong electricity is too large, and the signal line can not withstand such magnetic field interference. Then, in the process of doing our engineering, we must remember not to route with the strong electricity. We must try our best to avoid the line passing through such an environment. If we have to pass the time, we must also do the shielding work of the line and keep a certain distance to ensure our engineering. the quality of. In the case of interference, we can use anti-jamming devices, but the effect is not obvious, the best way is to stay away from strong electricity.

"A few lines and 380V lines are coming together, and the interference is particularly powerful."

First check the image of one road: unplug the cable with serious interference from the main unit and use a monitor (or TV) to directly view the image. That is, the camera - transmission cable - monitor, see if there is interference? Monitor power supply with 2 plugs, do not connect to the ground, and do not touch other grounded objects.

1. There is interference - check the front camera output for interference? If not, the interference is from the line coupling, it is true interference; if the front camera output has interference, - camera or power failure, eliminate - this is false interference;

2. Use the independent monitor to see no interference, indicating that the camera output has no interference, and the line does not introduce interference. But when you receive the host to see this road, there is interference - it must be false interference, most of which is the ground loop interference introduced by "multi-point grounding" - the correct design is: the system can only connect the host to the ground, all the cameras at the front end, The power ground should be insulated from the ground. Without the anti-jamming device, and without changing the transmission mode, it will be solved, and more importantly, it will eliminate the "safety hazard";

3. The true interference introduced by the line is generally not particularly powerful. Basically, the image can be seen clearly, and the anti-jamming device can be effectively solved; if the interference is severe, the image is almost invisible, and most of them are false interference.

"There is a big problem with coaxial, that is, the interference problem is very difficult to handle. Even with the anti-jamming device, the image will be somewhat re-distorted."

About coaxial interference problems:

1. Conventional meaning of electromagnetic interference refers to the interference of space electromagnetic waves received by the cable as a receiving "antenna". The engineering practice in the past few years has proved that video baseband transmission (0~6M), common electromagnetic interference, and weighted anti-jamming device can be solved immediately;

2. The occurrence of engineering interference phenomenon involves many factors. Equipment failure can also cause interference phenomena, such as camera failure, camera power failure, etc., and interference can also occur. Although many people also discuss it as interference, this belongs to Excluding the equipment failure problem, the fault is solved, and the interference is solved. In essence, this is caused by subjective factors; also, the multi-point grounding problem of the video system, which artificially introduces the "ground potential" in design and construction. The interference caused by the video system is also caused by the observation factor, the single point grounding is solved, and so on; in this category we classify it as "fault-like interference" - false interference.

3. True interference, can be "prevented" (such as wearing galvanized iron pipe), can be "avoided" (using fiber optic cable, or radio frequency), can also be "anti-" (with anti-jamming device); false interference - a fault caused by subjective factors The problem can only be solved by improving the level and accumulating design and construction experience. Anti-jamming devices can solve true interference, but it is not a substitute for troubleshooting equipment and correcting your design errors.