12 common faults and treatment methods of computer room monitoring system

After a monitoring system enters the commissioning stage, trial operation stage and delivery, there may be such and other failure phenomena, these failure phenomena are not normal operation, or the system does not meet the technical specifications required by the design, or the overall performance And the quality is not ideal, the following are some of the more common faults, which are provided to netizens for reference.

1. Equipment failure caused by incorrect power supply

Solution: The incorrect power supply has the following possibilities: the power supply line or the power supply voltage is incorrect, the power is not enough (or the diameter of a 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 , Instant overpressure, etc. In particular, damage to equipment due to power supply errors or instantaneous overvoltages occurs from time to time.

2. Some lines, especially the lines connected to the equipment, are not handled well, resulting in open circuit, short circuit, poor insulation between the lines, wrong wiring, etc. leading to damage to the device (or parts), reduced performance or the device itself has not been damaged , But the phenomenon reflected is on the device or component. In particular, the poor quality of some connectors and the poor connection process are the common causes of problems.

Solution: In this case, analyze calmly according to the fault phenomenon, and determine which lines are caused by the problem of the connection of several lines. This will reduce the scope of the problem. For example, the image signal of a camera with a three-variable lens is normal, but the lens cannot be controlled, so there is no need to check the video output line, but only the lens control line. In addition, the connector, especially the BNC type connector, has very high requirements for the welding process and the connection and installation process of the video cable. If it is not handled properly, even if there are no problems during the debugging and trial operation phase, the problem will occur after a period of operation. It is particularly worth noting that due to the omnidirectional movement of the camera with the gimbal, it takes a long time to cause the connection to fall off and break. Therefore, pay special attention to the connection between the equipment and various lines in this case should meet the requirements of long-term operation.

3. The quality of the equipment or component itself. Generally speaking, after carefully selected commercialized equipment or components, there should be no quality problems.

Solution: Even if the problem occurs, it often happens after the system has been delivered and used for a long time. In addition to the above-mentioned product quality problems, the most common problem is due to improper adjustment of equipment. For example, the adjustment of the camera's back intercept is a very precise and precise task. Without careful adjustment, problems such as poor focus or defocusing during various operations of the three variable lens will occur. In addition, whether the positions of some switches and adjustment knobs on the camera are correct, whether they meet the technical requirements of the system, and whether the decoder coding switch or other adjustable parts are set correctly will directly affect the normal use of the device itself or the normal performance of the entire system.

4. Problems caused by incorrect connection between the device (or component) and the device (or component)


· Impedance mismatch, such as when the video is connected to a monitor with high impedance, the image will be very bright, the characters will jitter or sometimes there will be no characters.

· The communication interface or communication method is incorrect. This kind of situation often occurs between the control host and the devices such as decoders or control keyboards that have communication control relationships. This is mostly due to the selection of the control host and decoder or control keyboard that are not products of one manufacturer. Generally speaking, the communication methods or control codes transmitted by different manufacturers are different. Therefore, the products of the same manufacturer should be selected for the host, decoder, control keyboard, etc.

· The driving capacity is not enough or exceeds the specified number of device connections. For example, the number of main control keyboards and auxiliary control keys corresponding to the control host is specified. Exceeding the specified quantity will cause the system to work abnormally. The working power of the decoder gimbal is lower than the actual gimbal, and the gimbal cannot be driven.

5. Failure of the gimbal. A pan / tilt does not work well or cannot rotate at all soon after use, which is a common malfunction of pan / tilt

Solution: In addition to the factors of product quality, this situation is mainly caused by the following reasons; only the pan-tilt with the camera installed directly (that is, the camera sits on the top of the pan-tilt turntable) is allowed to be used when it is used. The way (that is, the camera is installed under the gimbal turntable). In this case, the hoisting method leads to increased operating load of the gimbal, so the transmission mechanism of the gimbal will be damaged soon after use, and even the motor will be burned.

The total weight of the camera and its protective cover exceeds the load bearing of the gimbal. Especially for the gimbal used outdoors, the weight of the protective cover is often too large, and the problem that the gimbal cannot rotate (especially in the vertical direction) often occurs. The outdoor gimbal has malfunctioned or even been damaged due to high ambient temperature, low temperature, poor waterproofing, and antifreeze measures.

6. When the distance is too far, the operation keyboard cannot remotely control the camera (including the lens) and the gimbal through the decoder

Solution: This is mainly because the control signal attenuation is too large 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.

7. The image contrast of the monitor is too small, the image is light

Solution: If this phenomenon is not a problem of the control host and the monitor itself, it is too long transmission distance or the video transmission line is too attenuated. In this case, a device for line amplification and compensation should be added.

8. Image clarity is not high, details are lost, in severe cases, color signal loss or color saturation is too small

Solution: This is caused by the loss of the high frequency end of the image signal is too large, so that the signal above 3MHz frequency is basically lost. In this case, the transmission distance is too far, and there is no amplification compensation device in the middle; or the distributed capacitance of the video transmission cable is too large; or the concentrated equivalent capacitance is distributed between the core line of the transmission line and the shielded line in the transmission link Caused.

9. Tonal distortion

Solution: This is a failure phenomenon that easily occurs in the long-distance video baseband transmission mode. The main reason is that the high-frequency phase shift of the signal caused by the transmission line is too large. In this case, a phase compensator should be added.

10. Operation keyboard failure

Solution: This phenomenon can basically be determined to be caused by the "crash" of the operating keyboard when there is no problem in checking the connection. On the operation of the keyboard, there are generally methods to solve the "death", such as "whole reset" and other methods, which can be solved by this method. If the problem cannot be solved, the keyboard itself may be damaged.

11. The host's image switching is not clean

Solution: The performance of this kind of fault phenomenon is the interference of other images superimposed on the screen after the selection and the interference of the line synchronization signal of other images. This is due to the poor quality of the matrix switch of the host, which cannot meet the isolation requirements between images. If a radio frequency transmission system is used, it may also be caused by excessive crosstalk modulation and intermodulation of the system.

A large-scale TV monitoring system that operates in conjunction with anti-theft alarms is a highly technical and complex system. Although various failure phenomena may occur, as long as the quality of the selected equipment and equipment is properly controlled and the construction is strictly in accordance with the standards and specifications, there will generally be no major problems. Even if a problem occurs, as long as you calmly analyze and think about it, "do the right thing," and not blindly dismantle and dismantle, you will solve the problem quickly.

12. Poor communication failure

Solution: The controlled gimbal or motorized lens can sometimes operate normally, sometimes it cannot (or delay) the operation, or it cannot stop after the operation. This is mainly due to a problem with the communication line. After confirming that the wiring is correct and the wiring is correct, check the matching resistance (120 |?) Of the RS-485 communication terminal on the decoder. Or disconnect the host interface and the farthest matching resistor, use a multimeter to measure the DC resistance RD of the terminal of a single communication chip and the DC resistance R2 of the communication port of the entire system, and compare with the theoretical calculation (R2 = R0 / n, where n It is the number of decoders connected in the whole system). If the difference is too large, it can be considered that there is a problem with the communication chip, and the problematic chip is found through the point-by-point elimination method. If the communication line has many branches, you can disconnect each branch to determine the approximate range of the communication failure.

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