1. Failure of the gimbal.
A pan/tilt will not operate quickly or at all after it is used. It is a common fault of the 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 head mounted on the camera is allowed to use the hoisting method. In this case, the hoisting method leads to an increase in the operational load of the pan/tilt. Therefore, the use of the hoisting method will soon lead to damage to the drive mechanism of the pan/tilt, or even burn the motor.
(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 the problem that the PTZ will not move (especially the vertical direction) will often occur.
(3) The outdoor pan/tilt head is faulty or even damaged due to bad ambient temperature, excessively low temperature, waterproof, and antifreeze measures.
(4) When the distance is too far, the camera (including the lens) and the pan/tilt cannot be controlled by the decoder through the operation keyboard. This is mainly because when the distance is too far, the attenuation of the control signal is too great 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.
2. The image contrast of the monitor is too small and the image is light.
This phenomenon is not the problem of controlling the host computer and the monitor itself, that is, the transmission distance is too long or the attenuation of the video transmission line is too large. In this case, the line amplification and compensation device should be added.
3. The sharpness of the image is not high, the detail is lost, and the color signal is lost or the color 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 a substantial loss of the signal 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 the distribution capacitance of the video transmission cable is too large; or the equivalent capacitance is concentrated in the transmission link between the core wire and the shielded wire. Caused.
4. Hue 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.
5. The operation keyboard is malfunctioning.
This phenomenon can basically be determined as the "deadlock" of operating the keyboard when there is no problem in checking the connection. Keyboard operation instructions, generally have to solve the "crash" method, such as "the whole reset" and other methods, this method can be used to solve. If it cannot be solved, it may be that the keyboard itself is damaged.
6. The host does not clean the image.
This failure phenomenon is manifested in the screen after the selection, the interference of other pictures superposed, or the interference of the line synchronization signals of other pictures. This is due to the poor quality of the main mechanism matrix switch and the requirement for isolation between images.
7. If a radio frequency transmission system is used, it may also be due to the system's large cross-talk modulation and inter-modulation.
8. The most common symptom in video transmission 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.
9. Grainy 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 good quality copper network, 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 this kind of video line is not 75 Ω and one of the reasons that causes the trouble is that the parameter is beyond the regulation. 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 it 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.
10. 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 often occurs 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 on the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
11. Malfunction due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. This is due to impedance mismatch caused by the characteristic impedance of the video transmission line is not 75 Ω. 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 generally to solve the problem by "connecting resistors in series" or "terminating resistors in parallel." In addition, it is worth noting that when the video transmission distance is short (typically within 150 meters), using the above video cable with impedance mismatch and distribution parameters that are too large will not necessarily result in the above-mentioned interference phenomenon.
12. Spatial radiation interference introduced by the transmission line. This interference phenomenon is mostly 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 keep away from the radiation source; another way is to strengthen the shielding of the front-end and center equipment when the radiation source cannot be avoided. The pipeline of the transmission line adopts steel pipe and is well grounded.
The fundamental solution to the above problem is to ensure quality when purchasing video cables. Sampling cables when necessary
A pan/tilt will not operate quickly or at all after it is used. It is a common fault of the 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 head mounted on the camera is allowed to use the hoisting method. In this case, the hoisting method leads to an increase in the operational load of the pan/tilt. Therefore, the use of the hoisting method will soon lead to damage to the drive mechanism of the pan/tilt, or even burn the motor.
(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 the problem that the PTZ will not move (especially the vertical direction) will often occur.
(3) The outdoor pan/tilt head is faulty or even damaged due to bad ambient temperature, excessively low temperature, waterproof, and antifreeze measures.
(4) When the distance is too far, the camera (including the lens) and the pan/tilt cannot be controlled by the decoder through the operation keyboard. This is mainly because when the distance is too far, the attenuation of the control signal is too great 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.
2. The image contrast of the monitor is too small and the image is light.
This phenomenon is not the problem of controlling the host computer and the monitor itself, that is, the transmission distance is too long or the attenuation of the video transmission line is too large. In this case, the line amplification and compensation device should be added.
3. The sharpness of the image is not high, the detail is lost, and the color signal is lost or the color 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 a substantial loss of the signal 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 the distribution capacitance of the video transmission cable is too large; or the equivalent capacitance is concentrated in the transmission link between the core wire and the shielded wire. Caused.
4. Hue 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.
5. The operation keyboard is malfunctioning.
This phenomenon can basically be determined as the "deadlock" of operating the keyboard when there is no problem in checking the connection. Keyboard operation instructions, generally have to solve the "crash" method, such as "the whole reset" and other methods, this method can be used to solve. If it cannot be solved, it may be that the keyboard itself is damaged.
6. The host does not clean the image.
This failure phenomenon is manifested in the screen after the selection, the interference of other pictures superposed, or the interference of the line synchronization signals of other pictures. This is due to the poor quality of the main mechanism matrix switch and the requirement for isolation between images.
7. If a radio frequency transmission system is used, it may also be due to the system's large cross-talk modulation and inter-modulation.
8. The most common symptom in video transmission 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.
9. Grainy 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 good quality copper network, 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 this kind of video line is not 75 Ω and one of the reasons that causes the trouble is that the parameter is beyond the regulation. 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 it 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.
10. 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 often occurs 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 on the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
11. Malfunction due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. This is due to impedance mismatch caused by the characteristic impedance of the video transmission line is not 75 Ω. 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 generally to solve the problem by "connecting resistors in series" or "terminating resistors in parallel." In addition, it is worth noting that when the video transmission distance is short (typically within 150 meters), using the above video cable with impedance mismatch and distribution parameters that are too large will not necessarily result in the above-mentioned interference phenomenon.
12. Spatial radiation interference introduced by the transmission line. This interference phenomenon is mostly 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 keep away from the radiation source; another way is to strengthen the shielding of the front-end and center equipment when the radiation source cannot be avoided. The pipeline of the transmission line adopts steel pipe and is well grounded.
The fundamental solution to the above problem is to ensure quality when purchasing video cables. Sampling cables when necessary
A Robe hook is a great way to hang bath towels and clothing to dry, and they aren't just for the bathroom. They are also great storage solutions for entryways, laundry rooms, kitchens, and bedrooms.
Robe Hook,Robe Hook Design Ideas,Wall Mounted Robe Hook,Double Robe Hooks
Kaiping Jenor Sanitary Ware Co., Ltd , https://www.kpjenorsanitary.com