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1. Device failure caused by incorrect power supply. Incorrect power supply may be as follows: The power supply line or power supply voltage is incorrect, the power is not enough (or the line diameter of a certain power supply line is not enough, the voltage drop is too large, etc.), the transmission line of the power supply system is short-circuited, open circuited, instantaneously Pressure and so on. In particular, the device may be damaged due to power supply errors or instantaneous overvoltage. Therefore, in the commissioning of the system, before the power supply, it must be carefully checked and checked carefully and must not be taken lightly.
2. Because there are many links in some devices, if the handling is not good, especially if the lines connected to the devices are not handled properly, there will be circuit breakers, short circuits, poor insulation between the lines, miswiring, etc. resulting in equipment damage and performance. Falling problem. In this case, the analysis should be made calmly based on the phenomenon of failure, and it should be determined on which of the lines that the connection is faulty. Therefore, special attention should be paid to the connection of equipment and various lines in this case to meet the requirements of long-term operation.
3. The quality of equipment or components itself. All kinds of equipment and components may have quality problems. They are purely product quality problems, and they often occur on decoders, electric gimbals, and transmission components. It is worth pointing out that the quality of some devices may not appear to be unusable due to their overall quality. However, some technical indicators do not meet the specifications given in the product specifications. Therefore, the necessary sample testing must be performed on the selected product. If it is indeed a product quality problem, the best way is to replace the product and not to dismantle and repair it.
4. Problems arising from incorrect connection between equipment (or components) and equipment (or components) will generally occur in the following areas:
(1) Impedance mismatch.
(2) Communication interface or communication method does not correspond. This situation mostly occurs between the control host and a device such as a decoder or a control keyboard that has a communication control relationship. That is, the selected control host and decoder or the control keyboard are not caused by a manufacturer's product. Therefore, the same manufacturer's products should be used for the host, the decoder, and the control keyboard.
(3) The drive capacity is insufficient or exceeds the specified number of device connections. For example, some picture splitters have an alarm input interface and a system host connected to alarm probes, long time delay recorders, etc. is provided in its product specification. If an alarm probe is connected to the screen splitter At the input, the probe's alarm signal will drive both the control panel and the screen divider. One of the solutions to the above problem is to use a dedicated alarm interface box to connect the alarm probe signal to the picture splitter or video switching host. Second, when there is no alarm interface box, the signal expansion device can be designed and processed independently. Or drive the device.
5. In video transmission, the most common symptom is the appearance of a black or white bar on the monitor screen, and it may scroll up or down slowly. Therefore, when analyzing such failure phenomena, two different causes of failures must be distinguished. To distinguish between power supply problems and ground loop problems, an easy way is to connect only one camera power output signal with no power problem to the control host. If the above interference does not occur on the monitor , then there is no problem with the control host. Next, a portable monitor can be connected nearby to the video output of the front camera and each camera can be checked one by one. If yes, handle it. If not, the interference is caused by ground loops and other causes.
6. Woody interference on the monitor. The appearance of such interference does not drown out the normal image when it is light, and the image cannot be viewed (and even destroy synchronization) when it is severe. The cause of this kind of failure phenomenon is more and more complicated. There are roughly the following reasons:
(1) The quality of the video transmission line is not good, especially the shielding performance is poor (the shielding network is not a copper network with good quality, or the shielding network is too thin to be shielded). At the same time, the line resistance of such video lines is too large, which causes the signal to have a large attenuation is also aggravating the cause of the failure. In addition, the characteristic impedance of such a video line is not 75 Ω and one of the causes of the malfunction is that the parameter is out of specification. Since the above-mentioned interference phenomenon is not necessarily a fault caused by a defective video line, the reason for this failure should be accurate and careful when judging. Only from the point of view of the video line can be considered when other possibilities are excluded. If it is really a cable quality problem, the best way is of course to replace all of these cables and replace them with cables that meet the requirements. This is the best way to completely solve the problem.
(2) The power supply system is not "clean". The power source referred to here is not "clean" and means that an interference signal is superimposed on a normal power source (a 50-cycle sine wave). This type of interference signal on the power supply mostly comes from devices that use thyristors in the power grid. In particular, high-current, high-voltage thyristor devices have a very serious pollution to the power grid, which leads to the fact that the power supply in the same power grid is not "clean." For example, in this power grid, there are high-power thyristor frequency modulation speed control devices, thyristor rectifier devices, thyristor AC-DC converter devices, and so on, all of which will cause pollution to 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 through investigation and understanding. If this is the reason, the solution is to strengthen the shielding of the camera, as well as to ground the pipeline of the video cable.
7. The fault caused by the short circuit and open circuit of the core wire of the video cable and the shield network. This failure manifests itself in a deep and chaotic large-area moire on the monitor, so that the image is completely destroyed and the image and synchronization signals cannot be formed. This happens mostly on BNC connectors or other types of video connectors. That is, when this kind of fault phenomenon occurs, it is not always the signal of the entire system that causes problems, but only appears in the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
How to install video surveillance system and fault solution
After a monitoring system is completed, it needs to enter the commissioning stage and commissioning stage before it can be delivered for use. Various failure phenomena may occur, such as common: technical indicators that cannot be operated normally, the system cannot meet the design requirements, and the overall performance and quality are not The ideal, especially for a complex, large-scale monitoring project, is inevitable, it is necessary for us to do the appropriate treatment to solve the problem and ensure the normal operation of the system.