Common faults and exclusions of the monitoring system : After a monitoring system enters the commissioning phase, commissioning phase, and after delivery, there may be such a failure phenomenon, such as: technical indicators that cannot function properly, the system cannot meet the design requirements, and the overall The performance and quality are not ideal, that is, some "soft problems." These problems are inevitable for a monitoring project, especially for a complex, large-scale monitoring project.
1. Incorrect power supply caused by equipment failure, the power supply is incorrect as the following possibilities.
• The power supply line or supply voltage is incorrect.
• The power is not enough (or the wire diameter of a certain power supply line is not enough, the pressure drop is too large, etc.).
• The supply system is short-circuited, open circuited, and instantaneously overvoltageed on the transmission line.
· Occasionally, equipment damage may occur due to power supply errors or instantaneous overvoltages. Therefore, before the system is commissioned, before the system is commissioned, it must be checked and checked carefully and strictly, and must not be taken lightly.
2. The camera with three variable lenses and the pan/tilt do not rotate/the lens does not work. There are many pieces of these devices connected, and often there are problems such as disconnection, short-circuit, poor insulation between wires, miswiring and so on, resulting in equipment damage and performance degradation.
· It is particularly worth pointing out that cameras with pan/tilt heads have a long time due to the full range of movements, and it is common for the connection to fall off and break. 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.
· Theoretically speaking, quality problems may occur in various equipment and components. However, from an experience point of view, the pure quality of the product itself occurs in 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, due to improper adjustment of the equipment.
· For example, the adjustment of the intercept after the camera is very detailed and accurate. If it is not carefully adjusted, there will be problems such as poor focus or defocusing during various operations of the three variable lenses.
· The correct position of some switches and adjustment knobs on the camera, whether it meets the technical requirements of the system, the correctness of the encoder code switch or other adjustable parts settings will directly affect the normal use of the device itself or affect the normal performance of the entire system.
5. Problems arising from incorrect connection between equipment (or components) and equipment (or components) will generally occur in the following areas:
Impedance mismatch.
· Communication interface or communication method does not correspond.
• Drive capacity is insufficient or exceeds the prescribed number of device connections.
Monitors
1. A black bar or white bar appears on the screen of the monitor, and it may scroll up or down slowly. There are two possible causes of failure.
· To distinguish between power supply problems and ground loop problems, an easy way is to connect only one camera output signal with no power problem to the control host. If the above interference does not occur on the monitor The phenomenon indicates that the control host has no problem. 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, proceed with the processing. If not, the interference is caused by ground loops and other causes.
2. Wood grain interference on the monitor.
The occurrence of such interference does not submerge the normal image when it is light, and the image cannot be viewed (or 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:
The quality of the video transmission line is poor, especially the shielding performance is poor (the shielding network is not a good quality copper network, or the shielding network is too thin to be shielded). At the same time, the line resistance of this type of video line is too large, which causes a large attenuation of the signal, which is also aggravating the problem. In addition, the characteristic impedance of this type of video line is not 75 ohms, which is also one of the causes of intentionality when the main parameter is out of specification. Since the above-mentioned interference phenomenon is not necessarily a failure caused by a poor video, 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.
· 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 equipment has a very serious pollution to the power grid, which leads to the fact that the power supply in the same power grid is not “cleanâ€. 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.
· 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.
3, the monitor produces a deep and chaotic large-area moire, so that the image is completely destroyed and the image and synchronization signals cannot be formed.
· Fault caused by the short circuit and open circuit of the core wire of the video cable and the shield network. This type of fault is most often seen 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.
4. A number of vertical bars with equal spacing are generated on the screen of the monitor, which is an integral multiple of the frequency of the interference signal.
• Symptoms due to mismatch in the characteristic impedance of the transmission line: This is due to impedance mismatch caused by the characteristic impedance of the video transmission line not being 75 ohms. 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 do not meet the requirements.
· The solution is usually solved by the method of “connecting resistors at the beginning†or “connecting resistors at the terminalsâ€. In addition, it is worth noting that when the video transmission distance is short (usually within 150 meters), using the above video cable with impedance mismatch and excessive distribution parameters does not necessarily cause the above-mentioned interference phenomenon. The fundamental method to solve the above problems is to ensure the quality when purchasing video cables. When necessary, the cable should be sampled and tested.
5, the screen on the monitor produces a number of fine stripes interference.
· Most of these interference phenomena are caused by strong, high-frequency spatial radiation sources near the transmission system, the system front-end, or the central control room.
· One of the solutions to this situation is to understand the surrounding environment when establishing the system and try to avoid or stay away from the radiation source:
· Another method is to strengthen the shielding of front-end and central equipment when the radiation source cannot be avoided, and use steel pipes for transmission lines and pipelines and ground them well.
PTZ
1, the failure of the PTZ A PTZ soon after use will not work properly or not at all, is a common failure PTZ. The appearance of this situation, apart from the factors of product quality, is generally caused by the following reasons:
(1) Only the pan/tilt that is mounted on the camera is allowed to use the lifting method. In this case, the hoisting method leads to an increase in the operational load of the pan-tilt. Therefore, soon after use, the pan-tilt mechanism will be damaged, and even the motor will be burned.
(2) The total weight of the camera and its protective cover exceeds the weight of the PTZ. Especially for PTZs that are used outdoors, the weight of the protective cover is often too large, and there is often the problem that the PTZ will not move (especially in the vertical direction).
(3) The outdoor pan/tilt head is faulty or even damaged due to poor ambient temperature, too low, waterproof, and frost-proof measures.
2. When the distance is too far, the keyboard cannot be controlled by the decoder on the camera (including the lens) and the head.
· This is mainly due to the fact that the control signal is attenuated too much when the distance is too far, and the control signal received by the decoder is too weak. At this time, a relay box should be installed at a certain distance to amplify the shaping control signal.
3, the monitor image contrast is too small, the image is light.
If this phenomenon is not the problem of controlling the main unit and the monitor itself, it is the transmission distance is too far or the video transmission line is greatly attenuated.
· In this case, the line amplification and compensation device should be added.
4, the image clarity is not high, the details are lost, serious color signal loss or saturation is too small.
· This is due to the fact that the loss of the high-frequency end of the image signal is too large, resulting in the basic loss of signals above 3 MHz.
· This situation may be due to the fact that the transmission distance is too long, and there is no amplification compensation device in the middle; or because the distribution capacitance of the video transmission cable is too large; or because there is a concentrated distribution equivalent between the core wire and shielded wire of the transmission line in the transmission link. Capacitor caused.
5, tone distortion.
· This is a fault phenomenon that easily occurs in long-distance video baseband transmission. The main reason is caused by the large phase shift of the high frequency band caused by the transmission line. In this case, a phase compensator should be added.
6, the operation of the keyboard fails.
· This phenomenon can basically be determined as the "deadlock" of operating the keyboard when there is no problem in checking the connection. On the operating instructions of the keyboard, there are generally methods to solve the "crash". For example, "all reset" and other methods can be solved by this method. If you can't solve it, you can damage the keyboard itself.
7, the host switch to the image is not clean.
· This failure phenomenon is manifested in the screen after the selection, the interference of other drawing is superimposed, or the interference of the line synchronization signal of other images. This is due to the poor quality of the host or matrix switch and the lack of image isolation.
· If you are using a radio frequency transmission system, it may also be caused by the fact that the system's crosstalk modulation is too large.
8, digital hard disk recorders can not start, there may be the following reasons.
· The host power switch has failed.
· The host power is damaged.
• Bad motherboard or CPU card • The boot area of ​​the main system hard disk is damaged, or the hard disk itself is malfunctioning.
· The operating system is damaged.
· Carefully analyze the above reasons and eliminate them one by one.
9, digital hard disk video recorder crashes (on-site monitoring of the image freezes or superimposed on the image time information does not go)
Software problems, including failure of the operating system or monitoring software in the PC-based hard disk host base; monitoring software problems for the embedded hard disk recording host. The main causes are the following:
· A file of the system software is destroyed, and the system or monitoring software is reinstalled for the PC hard disk host; the embedded host needs to upgrade the software.
· There are disk bad sectors in the hard disk in the host. The hard disk needs to be repaired or replaced.
· The power supply in the host is not enough. Replace the high-power power supply.
· There are too many hard drives in the host, too much heat, causing dead.
· The host video card is overheated, causing a crash, replacing the video card or replacing the host.
A large-scale television monitoring system that operates in conjunction with anti-theft alarms is a high-tech and complex system. Although various kinds of failure phenomena may occur, as long as the quality of selected equipment and equipment is used strictly, and construction is strictly conducted in accordance with standards and specifications, generally there will be no major problems. Even if it appears, as long as it is calmly analyzed and thought, If you do not blindly dismantle, it will be better to solve the problem.
1. Incorrect power supply caused by equipment failure, the power supply is incorrect as the following possibilities.
• The power supply line or supply voltage is incorrect.
• The power is not enough (or the wire diameter of a certain power supply line is not enough, the pressure drop is too large, etc.).
• The supply system is short-circuited, open circuited, and instantaneously overvoltageed on the transmission line.
· Occasionally, equipment damage may occur due to power supply errors or instantaneous overvoltages. Therefore, before the system is commissioned, before the system is commissioned, it must be checked and checked carefully and strictly, and must not be taken lightly.
2. The camera with three variable lenses and the pan/tilt do not rotate/the lens does not work. There are many pieces of these devices connected, and often there are problems such as disconnection, short-circuit, poor insulation between wires, miswiring and so on, resulting in equipment damage and performance degradation.
· It is particularly worth pointing out that cameras with pan/tilt heads have a long time due to the full range of movements, and it is common for the connection to fall off and break. 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.
· Theoretically speaking, quality problems may occur in various equipment and components. However, from an experience point of view, the pure quality of the product itself occurs in 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, due to improper adjustment of the equipment.
· For example, the adjustment of the intercept after the camera is very detailed and accurate. If it is not carefully adjusted, there will be problems such as poor focus or defocusing during various operations of the three variable lenses.
· The correct position of some switches and adjustment knobs on the camera, whether it meets the technical requirements of the system, the correctness of the encoder code switch or other adjustable parts settings will directly affect the normal use of the device itself or affect the normal performance of the entire system.
5. Problems arising from incorrect connection between equipment (or components) and equipment (or components) will generally occur in the following areas:
Impedance mismatch.
· Communication interface or communication method does not correspond.
• Drive capacity is insufficient or exceeds the prescribed number of device connections.
Monitors
1. A black bar or white bar appears on the screen of the monitor, and it may scroll up or down slowly. There are two possible causes of failure.
· To distinguish between power supply problems and ground loop problems, an easy way is to connect only one camera output signal with no power problem to the control host. If the above interference does not occur on the monitor The phenomenon indicates that the control host has no problem. 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, proceed with the processing. If not, the interference is caused by ground loops and other causes.
2. Wood grain interference on the monitor.
The occurrence of such interference does not submerge the normal image when it is light, and the image cannot be viewed (or 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:
The quality of the video transmission line is poor, especially the shielding performance is poor (the shielding network is not a good quality copper network, or the shielding network is too thin to be shielded). At the same time, the line resistance of this type of video line is too large, which causes a large attenuation of the signal, which is also aggravating the problem. In addition, the characteristic impedance of this type of video line is not 75 ohms, which is also one of the causes of intentionality when the main parameter is out of specification. Since the above-mentioned interference phenomenon is not necessarily a failure caused by a poor video, 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.
· 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 equipment has a very serious pollution to the power grid, which leads to the fact that the power supply in the same power grid is not “cleanâ€. 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.
· 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.
3, the monitor produces a deep and chaotic large-area moire, so that the image is completely destroyed and the image and synchronization signals cannot be formed.
· Fault caused by the short circuit and open circuit of the core wire of the video cable and the shield network. This type of fault is most often seen 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.
4. A number of vertical bars with equal spacing are generated on the screen of the monitor, which is an integral multiple of the frequency of the interference signal.
• Symptoms due to mismatch in the characteristic impedance of the transmission line: This is due to impedance mismatch caused by the characteristic impedance of the video transmission line not being 75 ohms. 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 do not meet the requirements.
· The solution is usually solved by the method of “connecting resistors at the beginning†or “connecting resistors at the terminalsâ€. In addition, it is worth noting that when the video transmission distance is short (usually within 150 meters), using the above video cable with impedance mismatch and excessive distribution parameters does not necessarily cause the above-mentioned interference phenomenon. The fundamental method to solve the above problems is to ensure the quality when purchasing video cables. When necessary, the cable should be sampled and tested.
5, the screen on the monitor produces a number of fine stripes interference.
· Most of these interference phenomena are caused by strong, high-frequency spatial radiation sources near the transmission system, the system front-end, or the central control room.
· One of the solutions to this situation is to understand the surrounding environment when establishing the system and try to avoid or stay away from the radiation source:
· Another method is to strengthen the shielding of front-end and central equipment when the radiation source cannot be avoided, and use steel pipes for transmission lines and pipelines and ground them well.
PTZ
1, the failure of the PTZ A PTZ soon after use will not work properly or not at all, is a common failure PTZ. The appearance of this situation, apart from the factors of product quality, is generally caused by the following reasons:
(1) Only the pan/tilt that is mounted on the camera is allowed to use the lifting method. In this case, the hoisting method leads to an increase in the operational load of the pan-tilt. Therefore, soon after use, the pan-tilt mechanism will be damaged, and even the motor will be burned.
(2) The total weight of the camera and its protective cover exceeds the weight of the PTZ. Especially for PTZs that are used outdoors, the weight of the protective cover is often too large, and there is often the problem that the PTZ will not move (especially in the vertical direction).
(3) The outdoor pan/tilt head is faulty or even damaged due to poor ambient temperature, too low, waterproof, and frost-proof measures.
2. When the distance is too far, the keyboard cannot be controlled by the decoder on the camera (including the lens) and the head.
· This is mainly due to the fact that the control signal is attenuated too much when the distance is too far, and the control signal received by the decoder is too weak. At this time, a relay box should be installed at a certain distance to amplify the shaping control signal.
3, the monitor image contrast is too small, the image is light.
If this phenomenon is not the problem of controlling the main unit and the monitor itself, it is the transmission distance is too far or the video transmission line is greatly attenuated.
· In this case, the line amplification and compensation device should be added.
4, the image clarity is not high, the details are lost, serious color signal loss or saturation is too small.
· This is due to the fact that the loss of the high-frequency end of the image signal is too large, resulting in the basic loss of signals above 3 MHz.
· This situation may be due to the fact that the transmission distance is too long, and there is no amplification compensation device in the middle; or because the distribution capacitance of the video transmission cable is too large; or because there is a concentrated distribution equivalent between the core wire and shielded wire of the transmission line in the transmission link. Capacitor caused.
5, tone distortion.
· This is a fault phenomenon that easily occurs in long-distance video baseband transmission. The main reason is caused by the large phase shift of the high frequency band caused by the transmission line. In this case, a phase compensator should be added.
6, the operation of the keyboard fails.
· This phenomenon can basically be determined as the "deadlock" of operating the keyboard when there is no problem in checking the connection. On the operating instructions of the keyboard, there are generally methods to solve the "crash". For example, "all reset" and other methods can be solved by this method. If you can't solve it, you can damage the keyboard itself.
7, the host switch to the image is not clean.
· This failure phenomenon is manifested in the screen after the selection, the interference of other drawing is superimposed, or the interference of the line synchronization signal of other images. This is due to the poor quality of the host or matrix switch and the lack of image isolation.
· If you are using a radio frequency transmission system, it may also be caused by the fact that the system's crosstalk modulation is too large.
8, digital hard disk recorders can not start, there may be the following reasons.
· The host power switch has failed.
· The host power is damaged.
• Bad motherboard or CPU card • The boot area of ​​the main system hard disk is damaged, or the hard disk itself is malfunctioning.
· The operating system is damaged.
· Carefully analyze the above reasons and eliminate them one by one.
9, digital hard disk video recorder crashes (on-site monitoring of the image freezes or superimposed on the image time information does not go)
Software problems, including failure of the operating system or monitoring software in the PC-based hard disk host base; monitoring software problems for the embedded hard disk recording host. The main causes are the following:
· A file of the system software is destroyed, and the system or monitoring software is reinstalled for the PC hard disk host; the embedded host needs to upgrade the software.
· There are disk bad sectors in the hard disk in the host. The hard disk needs to be repaired or replaced.
· The power supply in the host is not enough. Replace the high-power power supply.
· There are too many hard drives in the host, too much heat, causing dead.
· The host video card is overheated, causing a crash, replacing the video card or replacing the host.
A large-scale television monitoring system that operates in conjunction with anti-theft alarms is a high-tech and complex system. Although various kinds of failure phenomena may occur, as long as the quality of selected equipment and equipment is used strictly, and construction is strictly conducted in accordance with standards and specifications, generally there will be no major problems. Even if it appears, as long as it is calmly analyzed and thought, If you do not blindly dismantle, it will be better to solve the problem.
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