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The super bodyguard of electronic products-talk about electromagnetic compatibility testing

Release time:

2022-12-12 15:21

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The super bodyguard of electronic products - Talking about EMC testing

With people's continuous awareness of electromagnetic compatibility, the importance of electromagnetic compatibility is also gradually increasing. The necessity of electromagnetic compatibility testing, the continuous development of science and technology, electromagnetic compatibility involves increasingly expanding fields. Nowadays, it is not only the electromagnetic compatibility itself that affects electromagnetic compatibility. As the internal structure is becoming more and more pocket-sized and complex, the problems of electromagnetic compatibility are becoming more and more important, such as electromagnetic interference, the radio cannot hear the broadcast, the data of some electronic devices are lost during the transmission, some medical electronic devices malfunction and trigger the device to be triggered to explode, the complete failure of a certain control function in the industrial process, etc. Electromagnetic interference or the radiation it generates can also cause some subtle changes in the organism itself, producing certain effects. Because of these disturbances and interference electromagnetic problems, it is particularly important to study the electromagnetic compatibility of electronic products.

The necessity of electromagnetic compatibility testing is reflected in.

1. For the reliability of electronic equipment

Electromagnetic compatibility refers to the ability of electronic equipment to work properly in the electromagnetic environment. Electromagnetic interference is a kind of electromagnetic change phenomenon that is harmful to the working performance of electronic equipment. Electromagnetic interference not only affects the normal work of electronic equipment, and even damage some components in electronic equipment. Therefore, due attention should be paid to the electromagnetic compatibility technology of electronic equipment. It should be noted that electronic equipment can work normally without surrounding electromagnetic interference, and electronic equipment itself will not cause electromagnetic interference to other equipment around, thus affecting the normal work of other equipment.

2. EMC testing for the safety of people and some special materials.

Electromagnetic waves and the control circuit of the electric explosion device induction coupling, the formation of interference currents may cause the explosion of the electric explosion device. Therefore the induction current and voltage of electromagnetic interference on the wire must be less than 15% of the rejection current and voltage. In addition, in the role of strong electromagnetic fields, a variety of fuels have the risk of combustion and explosion; electromagnetic energy through the physical and chemical effects on human tissue to produce harmful physiological effects. Therefore, for the safety of people and some special materials, GJB786 also provides that the electromagnetic radiation of electronic equipment does not exceed 4mW/cm2. on average, not more than 2mW/cm2.

3. electromagnetic compatibility testing for the needs of the present and future war.

The electromagnetic pulse generated by the nuclear explosion to the speed of light outward radiation, the electric field strength of up to 105V / m, magnetic field strength of up to 260A / m, pulse width of 20ns, electromagnetic pulse peak frequency of 105Hz. when this electromagnetic pulse on the role of electronic equipment, the light electronic equipment performance deterioration, heavy circuit components damage. Especially in today's and future warfare, the EMP bombs that have been used and the high-power microwave weapons being developed have EMP radiation similar to that generated by nuclear explosions, which can pose a deadly threat to electronic equipment. Electromagnetic compatibility can provide the basic technical guidance to deal with this threat.

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