[ Huaqiang Security Network News ] This article introduces the common faults and solutions for electronic eyes. One of the ways to solve the above problems is to use the dedicated alarm interface box to switch the signal of the alarm probe to the screen splitter or video switch host. Corresponding connection, the second is to design the processing signal expansion device or drive device without the alarm interface box.
5. In video transmission, the most common failure phenomenon is that a black bar or white bar appears on the monitor's screen, and slowly scrolls up or down. Therefore, when analyzing such fault phenomena, it is necessary to distinguish between two different causes of faults. To distinguish between the problem of the power supply or the problem of the ground loop, an easy way is to connect only one camera with a power supply without a problem on the control panel. If there is no such interference on the monitor. , then the control host has no problem. Next, use a portable monitor to connect to the video output of the front camera and check each camera one by one. If so, proceed with the processing. If not, the interference is caused by other reasons such as the ground loop. 6. Wood grained interference appears on the monitor. The appearance of such interference does not overwhelm the normal image when it is slight, and the image cannot be viewed (or even destroys the synchronization) when it is severe. The causes of such failures are more complicated and complicated. There are several reasons for common faults in electronic eyes:
(1) The quality of the video transmission line is not good, especially the shielding performance is poor (the shielding net is not a good quality copper wire mesh, or the shielding mesh is too thin to prevent shielding). At the same time, the line resistance of such video lines is too large, which causes a large attenuation of the signal, which is also a cause of aggravation. In addition, the characteristic impedance of such video lines is not 75Ω and the parameter is out of specification is also one of the causes of failure. Since the above-mentioned interference phenomenon is not necessarily a failure caused by a bad video line, the cause of such a failure is accurate and prudent in judging. Only when the other possibilities are excluded can we consider from the perspective of the video line. If it is really a cable quality problem, the best way is to replace all of this cable and replace it with a cable that meets the requirements. This is the best way to solve the problem completely.
(2) Due to the fact that the power supply of the power supply system is not "clean". The power source referred to here is not "clean", which means that an interference signal is superimposed on a normal power source (a 50-sine sine wave). The interference signals on such power sources are mostly from devices using thyristors in the power grid. Especially for high-current, high-voltage thyristor equipment, the pollution of the power grid is very serious, which leads to the power supply in the same power grid is not "clean." For example, there are high-power thyristor frequency modulation speed regulation devices, thyristor rectifier devices, thyristor AC/DC converters, etc. in the power grid, which will pollute 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 by investigation and understanding. If this is the case, the solution is to strengthen the shielding of the camera and ground the pipeline of the video cable.
7. Failure due to short circuit and open circuit of the core wire of the video cable and the shielded cable. This type of failure is manifested by the generation of deeper and more chaotic large-area moire on the monitor, so that the image is completely destroyed, and the image and synchronization signals are not formed. This is often the case with BNC connectors or other types of video connectors. That is to say, when such a fault phenomenon occurs, it is often not a problem of the signals of the entire system, but only the number of paths in which the joints are not good. As long as you carefully check these connectors one by one, you can solve them.
8. A fault phenomenon caused by a mismatch in the characteristic impedance of the transmission line. This phenomenon is manifested in that a plurality of vertical strips of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integer multiple of the horizontal frequency. This is due to the impedance mismatch caused by the characteristic impedance of the video transmission line being 75Ω. It can also be said that this interference phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable are not in compliance with the requirements. The solution is generally solved by the method of “starting series resistor†or “terminal paralleling resistorâ€. In addition, it is worth noting that when the video transmission distance is short (usually within 150 meters), the above-mentioned interference phenomenon may not occur with the video cable having the above-mentioned impedance mismatch and excessive distribution parameters. The fundamental solution to the above problem is to ensure quality when purchasing video cables. The cable should be sampled if necessary.
9. Space radiation interference introduced by the transmission line. Most of this interference phenomenon occurs because there is a strong, high-frequency spatial radiation source near the transmission system, the front end of the system, or the central control room. One solution to this situation is to understand the surrounding environment when the system is established, try to avoid or keep away from the radiation source; another method is to strengthen the shielding of the front end and the center equipment when the radiation source cannot be avoided. The pipeline of the transmission line is made of steel pipe and well grounded.
10. The failure of the gimbal. A gimbal does not work well or cannot rotate at all after use. It is a common malfunction of the gimbal. The emergence of this situation, in addition to the factors of product quality, is generally caused by the following reasons:
(1) Only the gimbal that is installed in the camera is allowed to be hoisted during use. In this case, the hoisting method leads to an increase in the operating load of the gimbal, so that the use of the gimbal's rotating mechanism may be damaged or even burned out.
(2) The total weight of the camera and its protective cover exceeds the weight of the gimbal. Especially for the outdoor use of the gimbal, the weight of the protective cover is often too large, and the problem that the gimbal can not turn (especially in the vertical direction) often occurs.
(3) The outdoor cloud platform is faulty or even damaged due to excessive ambient temperature, low temperature, poor waterproofing and antifreeze measures.
11. When the distance is too far, the keyboard cannot remotely control the camera (including the lens) and the pan/tilt through the decoder.
This is mainly because when the distance is too far, the control signal is attenuated too much, and the control signal received by the decoder is too weak. At this time, a relay box should be added at a certain distance to amplify the shaping control signal.
5. In video transmission, the most common failure phenomenon is that a black bar or white bar appears on the monitor's screen, and slowly scrolls up or down. Therefore, when analyzing such fault phenomena, it is necessary to distinguish between two different causes of faults. To distinguish between the problem of the power supply or the problem of the ground loop, an easy way is to connect only one camera with a power supply without a problem on the control panel. If there is no such interference on the monitor. , then the control host has no problem. Next, use a portable monitor to connect to the video output of the front camera and check each camera one by one. If so, proceed with the processing. If not, the interference is caused by other reasons such as the ground loop. 6. Wood grained interference appears on the monitor. The appearance of such interference does not overwhelm the normal image when it is slight, and the image cannot be viewed (or even destroys the synchronization) when it is severe. The causes of such failures are more complicated and complicated. There are several reasons for common faults in electronic eyes:
(2) Due to the fact that the power supply of the power supply system is not "clean". The power source referred to here is not "clean", which means that an interference signal is superimposed on a normal power source (a 50-sine sine wave). The interference signals on such power sources are mostly from devices using thyristors in the power grid. Especially for high-current, high-voltage thyristor equipment, the pollution of the power grid is very serious, which leads to the power supply in the same power grid is not "clean." For example, there are high-power thyristor frequency modulation speed regulation devices, thyristor rectifier devices, thyristor AC/DC converters, etc. in the power grid, which will pollute 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 by investigation and understanding. If this is the case, the solution is to strengthen the shielding of the camera and ground the pipeline of the video cable.
7. Failure due to short circuit and open circuit of the core wire of the video cable and the shielded cable. This type of failure is manifested by the generation of deeper and more chaotic large-area moire on the monitor, so that the image is completely destroyed, and the image and synchronization signals are not formed. This is often the case with BNC connectors or other types of video connectors. That is to say, when such a fault phenomenon occurs, it is often not a problem of the signals of the entire system, but only the number of paths in which the joints are not good. As long as you carefully check these connectors one by one, you can solve them.
8. A fault phenomenon caused by a mismatch in the characteristic impedance of the transmission line. This phenomenon is manifested in that a plurality of vertical strips of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integer multiple of the horizontal frequency. This is due to the impedance mismatch caused by the characteristic impedance of the video transmission line being 75Ω. It can also be said that this interference phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable are not in compliance with the requirements. The solution is generally solved by the method of “starting series resistor†or “terminal paralleling resistorâ€. In addition, it is worth noting that when the video transmission distance is short (usually within 150 meters), the above-mentioned interference phenomenon may not occur with the video cable having the above-mentioned impedance mismatch and excessive distribution parameters. The fundamental solution to the above problem is to ensure quality when purchasing video cables. The cable should be sampled if necessary.
9. Space radiation interference introduced by the transmission line. Most of this interference phenomenon occurs because there is a strong, high-frequency spatial radiation source near the transmission system, the front end of the system, or the central control room. One solution to this situation is to understand the surrounding environment when the system is established, try to avoid or keep away from the radiation source; another method is to strengthen the shielding of the front end and the center equipment when the radiation source cannot be avoided. The pipeline of the transmission line is made of steel pipe and well grounded.
10. The failure of the gimbal. A gimbal does not work well or cannot rotate at all after use. It is a common malfunction of the gimbal. The emergence of this situation, in addition to the factors of product quality, is generally caused by the following reasons:
(1) Only the gimbal that is installed in the camera is allowed to be hoisted during use. In this case, the hoisting method leads to an increase in the operating load of the gimbal, so that the use of the gimbal's rotating mechanism may be damaged or even burned out.
(2) The total weight of the camera and its protective cover exceeds the weight of the gimbal. Especially for the outdoor use of the gimbal, the weight of the protective cover is often too large, and the problem that the gimbal can not turn (especially in the vertical direction) often occurs.
(3) The outdoor cloud platform is faulty or even damaged due to excessive ambient temperature, low temperature, poor waterproofing and antifreeze measures.
11. When the distance is too far, the keyboard cannot remotely control the camera (including the lens) and the pan/tilt through the decoder.
This is mainly because when the distance is too far, the control signal is attenuated too much, and the control signal received by the decoder is too weak. At this time, a relay box should be added at a certain distance to amplify the shaping control signal.
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