In order to prevent the electromagnetic Interference effects of some electronic products or destruction of other electronic equipments to work properly, or national governments. Some international organizations have put forward or set some laws and regulations related to the electronic products to produce electromagnetic Interference or standard, for example, the European Union CE - EMC directive, such as the United States FCC certification, EMC certification is in Japan, the Japanese electromagnetic Interference Control commission (Voluntary Control Council for Interference byInformation TechnologyEquipment) management, known as VCCI certification in Japan,VCCI certification is not mandatory, but the addition of the VCCI certification logo has become a symbol of excellent product quality, most of the information technology products sold in the Japanese market have this label, so the information technology products sold in Japan, will generally be required to conduct VCCI certification
