Causes and solutions for false alarms of burglar alarm accessories 1 False alarm caused by improper system design Equipment selection is the key to system design, and there are many types of alarm equipment, each with its own characteristics, scope of application and limitations. If improperly selected, it will cause false alarms. For example, the use of a vibrating detector near the near-source (airport, railway) can easily cause false alarms in the system; the use of ultrasonic detectors in places where bats are often present also causes the system to falsely alarm, because the bat emits ultrasonic waves; High-frequency sounds such as electric ringtones and metal impact sounds can cause false alarms of single-tech glass break detectors. Therefore, system designers should be familiar with the principles and characteristics of various alarm devices to reduce false alarms caused by improper equipment selection. , scope of application and limitations. At the same time, it is necessary to master the on-site environmental conditions, climate conditions, electromagnetic field strength and illuminance changes, etc., in order to select alarm equipment according to local conditions. In addition to equipment selection, improper system design is also reflected in equipment installation location, installation angle, protective measures and system wiring. For example, when a passive infrared intrusion detector is installed against an air conditioner or a ventilating fan, it will cause a false alarm of the system; if the outdoor active infrared detector is not properly shielded from the sun (the sun shield is also best protected), it is bound to be Cause the system's false alarm; when the distance between the alarm line and the power line, lighting line and other strong electric lines is less than 1.5m, without the anti-electromagnetic interference measures, the system will also generate false alarms. 2 False alarm caused by improper construction This part of the problem is mainly reflected in the following aspects: (1) Construction is not strictly in accordance with design requirements. (2) The equipment is not installed securely or the angle of inclination is not suitable. (3) The solder joint has a virtual weld or burr, or the shielding measures are not appropriate. (4) The sensitivity of the device is not well adjusted. (5) The testing equipment for construction does not meet the measurement requirements. The solution to the above problems is to strengthen the supervision and management of the construction process and implement the security engineering supervision system as soon as possible, which is conducive to improving the quality of the project and reducing false alarms caused by the construction link. 3 false alarm caused by improper use of the user Improper use by the user often causes false alarms of the alarm system. For example: the window with the magnetic switch is not inserted, and the wind is blown away at night; the staff mistakenly enters the warning zone; the emergency alarm device is accidentally triggered; the system check-in personnel misuse; the work program change is not noticed, etc. The cause of the system's false alarm. Analysis of the user's improper use, to find out where the error is, improve the level of the user, can greatly reduce the number of false alarms of the alarm system. 4 false alarm caused by environmental noise The false alarm caused by environmental noise refers to the alarm system generated under normal working conditions, which is inevitable in principle, and the fact is unnecessary, which is a false alarm. For example: hot air caused by false alarm of passive infrared intrusion detector; high frequency sound caused false alarm of single technical glass broken detector; ultrasonic source caused false alarm of ultrasonic detector. A more effective measure to reduce such false alarms is to use a dual detector (two different detectors detect the "target" at the same time, and the alarm will send an alarm signal). The current products include: microwave-passive infrared double-decker, voice-vibration glass-breaking double-decker, ultrasonic-passive infrared double-dec. However, some environmental noise double detectors can't do anything, for example: mice in the guard zone; pets walking around the room. To this end, the scientific and technical personnel have introduced the micro-processing technology into the alarm system, so that it has certain identification and thinking ability, and can judge to some extent whether it is an intruder or an alarm caused by environmental noise. Therefore, to reduce false alarms, it is indispensable to start from the aspect of civil air defense. The establishment of an alarm information confirmation mechanism can reduce the number of alarms. After receiving the alarm information, the alarm center should send an acknowledgment signal to the alarm host, indicating that the center has received, and the alarm host should resend when it does not receive the acknowledgment signal. In terms of technology, the alarm signal can be confirmed by various means at present, such as installing multiple detectors (commonly used is dual infrared + infrared plus microwave), and when multiple probes simultaneously detect the intrusion signal, they send to the host. Alarm signal to reduce the false alarm rate. In addition, the state can also formulate some regulations on false alarms. For example, some local government agencies in foreign countries take measures such as inspections, fines, and punishments for alarm users or security companies. If the number of alarms exceeds the prescribed number within a certain period of time, a fine will be imposed. This can play a certain role in restricting human error. 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