Video surveillance is a huge and complex switcher, because the location of each monitoring point is different, in the process of debugging the video surveillance switcher, the human and time cost is an investment that can not be ignored. How to save the cost is a major issue for many engineers. The following author takes the camera debugging in video surveillance switcher as an example to provide a debugging scheme for your reference.
Generally speaking, when the surveillance center can not accept the image, the first thing that engineers think about is to detect whether the camera is normal. When testing these cameras, technicians can use video surveillance tester to start from the following three aspects:
1. Use the tester to check whether the camera has an image or not. If you can see the image captured by the camera on the screen of the tester, it means that the camera is not a problem. Otherwise, it means that the camera has a fault and needs to be maintained.
2. Detect the attenuation of the video signal by the tester. By connecting the video signal to the tester, we can see the level of the video signal of the camera. The normal range is 800-1000mV. The low level will cause the image to darken. If the level is too high, the image will have a false shadow.
3. When the above two conditions are detected correctly, the third possibility is to detect whether the transformer of the camera is normally powered. Transformer failure is the most common situation in the process of monitoring switch debugging. Normally, the transformer outputs 12 volts of DC voltage. So technicians can compare the measured voltage value with it, and then make a judgment.
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