No matter how good the performance of the supermarket anti-theft system is, it is also an electronic product. Everyone knows that the quality of electronic products cannot reach 100%, and there may be false positives and under-reports. These are normal phenomena and the reasons are also It's very complicated, so you have to have a correct understanding of these two concepts. The following editor will introduce to you. The difference between false positives and false negatives in acousto-magnetic systems.
False alarms of supermarket anti-theft systems occur, part of which is caused by the attachment of anti-theft tags to the supermarket alarms, or the customers have magnetic objects close to the alarm frequency of the radio frequency anti-theft alarm of 8.2MHZ, which will cause false alarms. There are also some false alarms that are affected by the surrounding electromagnetic waves, such as large electrical appliances, anti-theft devices of nearby businesses, and metal substances whose frequency will affect the anti-theft alarm. At this time, you should check the environment around the alarm to check whether there are any such things. Whether the item caused a false alarm.
The occurrence of under-reporting of the supermarket anti-theft system may be caused by the surrounding electromagnetic field interference and misoperation. It may also be due to the lack of motherboard technology to deal with interference and so on. When the EAS system is in the electromagnetic field, the system may have an abnormal working state. For example, when there is no anti-theft tag signal with the frequency allowed by the system to pass through the working range of the device, the system can still send out an audible and visual alarm. This phenomenon is called a false alarm, and when the system allows the anti-theft tag signal of the frequency to pass through the working range of the device, it is a false alarm if the system does not work.
In fact, these two concepts only represent a state of use, but it is difficult to make a clear judgment before using the supermarket anti-theft system, and even if the judgment is clear, there is still a lot of room for misleading. Therefore, when choosing a supermarket anti-theft system, you should check the various important indicators of the antenna and select the best admission. At the same time, it is best to conduct a field inspection and test. Various factors should be checked during installation to ensure the normal operation of the anti-theft device.