What are the common causes of frequent false alarms in EAS AM detection systems?

Frequent false alarms in EAS AM detection systems are typically caused by the following factors, which can be analyzed from four aspects: environment, equipment, labels, and operation:

1. Environmental Factors

Metal Interference: Metal objects such as door frames, shelves, brackets, and decorative parts near the detection door can interfere with the magnetic field, leading to false alarms.

Electromagnetic Interference (EMI): The presence of strong electromagnetic sources nearby (inverters, wireless equipment, mobile phone base stations, etc.) can interfere with AM signals.

Improper Door Installation: Doors near areas with high magnetic interference or improperly installed can cause the system to misjudge.

2. Equipment Factors

Aging or Damaged Antenna: Damaged antennas, aging wiring, or poor contact can produce abnormal signals.

Excessively High Sensitivity Setting: Excessively high sensitivity can trigger alarms even with weak signals.

Controller or Signal Processing Failure: Internal system malfunctions can lead to frequent false alarms.

3. Label Factors

Residual or Damaged Labels: Unremoved labels, damaged labels, or labels hidden inside packaging can trigger alarms.

Mismatched Label Types: Labels that are not AM or have different frequencies may cause interference.

Tag overlap or attachment to metal: This strengthens the signal and causes false alarms.

4. Operational and Management Factors

Incorrect tag removal: Improper operation by sales personnel may result in tags not being demagnetized or removed.

Goods placed too densely or near doorways: Increases magnetic field interference, leading to false alarms.

Insufficient system maintenance: Failure to clean dust around the antenna or regular calibration increases the false alarm rate.

Summary: False alarms in the EAS AM detection system are mainly caused by four categories of reasons: environmental interference, equipment status, tag problems, and improper operation.