Methods for Failing Electromagnetic Compatibility Testing

Firstly, it is necessary to diagnose the product based on the actual situation, analyze the sources interference and the ways and means of mutual interference. Based on the analysis results, targeted rectification will be carried out. Generally speaking, the main rectification methods are as follows:

1. On the basis of finding the interference source, the interference source can be weakened within the allowable range.

2. The classification and organization of wires and cables in electronic devices, wire to wire coupling is an important pathway and a significant cause of interference. Due to frequency factors, it can be roughly divided into high-frequency coupling and low-frequency coupling. Due to different coupling methods, the rectification methods are also different.

3. The ideal ground wire for improving the grounding system is a physical entity with zero impedance and zero potential. It is not only a reference point for signals, but also does not produce a voltage drop when current point for signals, but also does not produce a voltage drop when current flows through it. In specific electrical and electronic equipment, this ideal ground wire does not exist, and when current flows through the ground wire, a voltage drop will inevitably occur.

4. Shielding is one of the important measures to improve the electromagnetic compatibility performance of electronic systems and devices, which can effectively suppress various electromagnetic interferences propagated through space. Shielding can be divided into magnetic field shielding, electric field shielding, and electromagnetic shielding according to their mechanisms.

5. Changing the wiring structure of a circuit board may result in some frequency points being determined by the distribution parameters of the wiring on the board, which is not very useful. This type of modification involves adding small inductors, capacitors, and magnetic beads to the wiring to change the circuit parameters structure and move it to frequency points with higher limit requirements.

In summary, the previous methods are all beneficial for improving electromagnetic compatibility, but the most widely used method is to change the structure of ground wires and the classification and organization of wire and cables. These methods not only save costs, but also are the most effective rectification methods. Although blocking may increase costs, its shielding effectiveness is sometimes unmatched by the other methods. Therefore, in actual rectification, the main methods should be to change the structure of ground wires, classify and organize wires and cables, and shield them, supplemented by other methods.

Therefore, in actual rectification, the main methods should be to change the structure of ground wires, classify and organize wires and cables, and shield them, supplemented by other methods.