February 22, 2025

Maintenance of monitoring system faults

Solutions to monitor system failures (1) : 1. Incorrect equipment caused by power failure. Incorrect power supply may be as follows: power supply line or power supply voltage is incorrect, power is not enough (or the wire diameter of a certain power supply line is not enough, buck is too large, etc.), the transmission line of the power supply system has a short circuit, open circuit, instantaneous over Pressure and so on. In particular, equipment damage due to power supply errors or momentary overvoltages occurs. 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. Since there are many links between certain devices (such as cameras with three variable lenses and pan/tilts), if the handling is not good, especially if the lines connected to the devices are not handled well, there will be open circuit, short circuit and line. Poor insulation, incorrect wiring, etc. result in equipment damage and performance degradation. 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. This will reduce the scope of the problem. It is particularly worth pointing out that cameras with pan-tilt heads have a long time due to all-round movements, resulting in disconnection and breakage of connections that are common. 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 the equipment or component itself. In theory, quality problems may occur on 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. When it is indeed a product quality problem, the best way is to replace the product and not to dismantle and repair it. In addition, the most common problems arise from improper adjustment of the equipment. For example, the adjustment of the camera's back focus is a very detailed and precise task. If the adjustment is not carefully performed, problems such as poor focus or defocusing during various operations of the three variable lenses may occur. In addition, whether the positions of some switches and adjusting knobs on the camera are correct, whether they meet the technical requirements of the system, or the correctness of the encoder coding switch or other adjustable site settings directly affect the normal use of the device itself or affect the normal performance of the entire system. .

4. Problems arising from improper connection between equipment (or parts) and equipment (or parts) can occur in the following ways:
(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. So for the host, decoder, control keyboard, etc. should use the same manufacturer's products.

(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. In this case, the problem of insufficient driving capacity often arises. The phenomenon shown is that although the screen divider can alarm, but the input alarm signal is weak and the workman is stable, resulting in the camera screen corresponding to the occurrence of the alarm signal is instantaneously converted to a full-screen screen on the monitor. However, it is lost (cannot hold), and the image on the monitor is still the multi-image before the alarm.

To solve a problem similar to the above:

One is to connect the alarm probe signal with the screen splitter or the video switching host through a dedicated alarm interface box.

The second is that in the absence of an alarm interface box, it can be designed and processed signal expansion equipment or drive equipment.

The problems mentioned above also appear in the output and distribution of video signals.

Solution to monitor system failure (2)
1. 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.

2. There is a grainy disturbance 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.

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