(EMC) is a very important quality indicators, it is not only related to the product itself, the reliability of the work and the use of safety, but also may affect the normal operation of other equipment and systems, related to the protection of the electromagnetic environment.?
European **** body government regulations, from January 1, 1996, all electrical and electronic products must be certified by the EMC, affixed with the CE mark to be sold in the European **** body market. This move has caused a wide impact in the world, governments have taken measures to implement mandatory management of the RMC performance of electrical and electronic products. Internationally more influential, such as the European Union 89/336/EEC Directive (i.e. EMC Directive), the U.S. Code of Federal Regulations CFR 47/FCC Rules, etc. have put forward clear requirements for electromagnetic compatibility certification.
So electrical products must do EMC certification.
Electromagnetic compatibility (EMC) is the ability of a device or system to operate in its electromagnetic environment in compliance with the requirements and not to produce intolerable electromagnetic interference with any equipment in its environment.
Therefore, EMC includes two requirements: on the one hand, it refers to the equipment in the normal operation of the process of electromagnetic interference in the environment can not exceed a certain limit; on the other hand, it refers to the apparatus in the environment of the existence of electromagnetic interference with a certain degree of immunity, that is, electromagnetic sensitivity.
The so-called electromagnetic interference refers to any electromagnetic phenomenon that can degrade the performance of the equipment or system. And the so-called electromagnetic interference is the performance degradation of equipment or system caused by electromagnetic interference.?
EMC includes EMI (Electromagnetic Interference) and EMS (Electromagnetic Survivability) two parts, the so-called EMI electromagnetic interference, is the machine itself in the process of the implementation of due function in the process of generating electromagnetic noise unfavorable to other systems; and EMS is the machine in the process of the implementation of the due function is not subject to the influence of the surrounding electromagnetic environment ability.