After a security monitoring system enters the commissioning phase, commissioning phase, and after delivery, there may be such a failure phenomenon of the security monitoring equipment, such as: the technical indicators that do not function properly, the system cannot meet the design requirements, and the overall performance and quality are not The ideal, that is, some "soft problems." These problems are inevitable for a security monitoring system engineering project, especially for a complex, large-scale monitoring project.
One, the power is not correct
Incorrect power supply may be as follows: The power supply line or power supply voltage is incorrect, the power is not enough (or the line diameter of a certain 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 circuited, instantaneously Pressure and so on. In particular, the device may be damaged due to power supply errors or instantaneous overvoltage. 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.
Second, the wiring is not good
Because there are many links between certain devices (such as cameras with three variable lenses and pan/tilt), 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 insulation. Poor, miswiring, etc. lead to equipment damage, performance problems. 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 requirement of long-term operation.
Third, quality problems
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 noting that some equipment may not be unusable due to its overall quality, but it may not meet the specifications given in the product specification on certain technical indicators. 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.
In addition, the most common problems are due to improper adjustment of equipment. For example, the adjustment of the intercept after the camera is very detailed and accurate. If the adjustment is not carefully performed, problems such as poor focusing or defocusing during various operations of the three variable lenses may 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, the correctness of the encoder coding switch or other adjustable position settings directly affect the normal use of the device itself or affect the normal performance of the entire system. .
Fourth, the connection is incorrect
Problems arising from incorrect connections between equipment (or parts) and equipment (or parts) generally occur in the following areas:
(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 control keyboard are not caused by a manufacturer's product. Therefore, the same manufacturer's products should be used for the host, the decoder, and the control keyboard.
(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 an alarm probe, a long time delay recorder, etc. is provided in its product specification. If the 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 work is not stable, resulting in the corresponding image of the camera that the alarm signal occurred on the monitor even though the camera is instantly converted to a full-screen image However, it is lost (cannot hold), and the image on the monitor is still the multi-image before the alarm.
One of the solutions to the above problem is to use a dedicated alarm interface box to connect the alarm probe signal with the screen splitter or video switching host. Secondly, when there is no alarm interface box, the signal expansion device can be designed and processed independently. Or drive the device.
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