Certification content summary

Electromagnetic compatibility (EMC) refers to the ability of equipment or system to meet the requirements in its electromagnetic environment and not produce intolerable electromagnetic interference to any equipment in its environment. Therefore, EMC includes two requirements: on the one hand, it means that the electromagnetic interference generated by the equipment to the environment during normal operation cannot exceed a certain limit; On the other hand, it means that the appliance has a certain degree of immunity to the electromagnetic interference in the environment, that is, electromagnetic sensitivity. The International Electrotechnical Commission Standard IEC defines electromagnetic compatibility as: the system or equipment can work normally in the electromagnetic environment without interference to other systems and equipment.

1. Instruction background:

Electromagnetic Compatibility Directive 89 / 336 / EC was formulated on May 3, 1989 and enforced on January 1, 1996. The European Commission adopted a new electromagnetic compatibility (EMC) Directive 2004 / 108 / EC on December 15, 2004. The new EMC directive will be implemented on July 20, 2007 to replace the current EMC Directive 89 / 336 / EEC. After the implementation of the new EMC directive, there is a two-year transition period, that is, products certified according to Directive 89 / 336 / EEC can still be sold in the European market before July 20, 2009.

2. Scope of instruction:

All kinds of electric and electronic appliances or systems, as well as equipment and devices containing electric and / or electronic components. These appliances, devices or equipment are prone to electromagnetic disturbance or their performance is vulnerable to such electromagnetic disturbance. The scope of this definition is quite wide. Theoretically, it includes all equipment, from electromagnetically driven toys to large industrial equipment. The product categories listed in Annex 3 of the directive further determine the specific scope of the above general definition:

-Household wireless and television receiver (TVB);
-Mobile radio equipment;
-Medical and science equipment;
-Household appliances and household electronic equipment;
-Electronic equipment for teaching;
-Radio and television transmitting equipment (R & TTE);
-Industrial equipment;
-Mobile wireless equipment;
-Technical information equipment (ITE);
-Aeronautical and maritime mobile radio;
-Communication equipment;
-General lamps and fluorescent lamps (lighting); 

3. Electromagnetic compatibility test scope (EMC)