When we go to shopping malls or supermarkets, there will always be rows of small gates at the entrance. In fact, that is a device specially used for anti-theft called a supermarket anti-theft device! It is very convenient, fast and very effective in the process of use, but there will be failures in the long-term use process. Among them, the non-alarming of the supermarket security antenna is one of the very common contents. So what happens when the supermarket security antenna does not alarm? Let’s take a look below! 

What’s wrong with the supermarket security antenna not alarming?

When it is found that the system is not working properly, first check whether the system power supply is normal: whether the power indicator on the motherboard is on; whether the printed board fuse (5F1) is in good condition; whether the input power supply voltage is correct; whether the power supply wiring is open or short-circuited; external power supply Whether the adapter works normally; whether the contact of the power socket is firm; whether the input voltage fluctuates too much, etc.

If the alarm light does not flash and there is no alarm sound when testing the label, first check whether the alarm light and buzzer are in good condition, and whether the alarm light and buzzer themselves are damaged. Whether the antenna wiring port is loose or falling off, if not, check the ALARM indicator on the printed board. “On” indicates that the system has alarmed, but there is no alarm output. At this time, some circuit failures (component failure or damage) should be considered. Note: When the environmental interference is very serious (signal indicators are all on), the system will not work properly.

The effective detection rate of testing supermarket security antennas can be called the blind spot or the false negative rate. Whether it is a supermarket or a shopping mall, there will be certain blind spots due to the impact of the environment. Blind zone refers to the area where the anti-theft antenna cannot issue an alarm when a valid tag enters the monitoring area. The environment and installation distance can affect the blind area. In an ideal environment, the suitable installation distance is 90cm, and the detection label is usually a domestic 4*4cm soft label. After the installation is completed, repeated tests are required. If the false negative rate is too high, the installation distance or the surrounding environment should be adjusted appropriately.

The above is the specific content of what happened when the supermarket security antenna does not ring. If such a situation occurs, we must ask the supplier to carry out maintenance and inspection in time to prevent economic losses!