The full name of electromagnetic compatibility testing (EMC) is Electro Magnetic Compatibility, which refers to the comprehensive evaluation of the interference level (EMI) and anti-interference ability (EMS) of electronic products in electromagnetic fields. ETR laboratories establish and implement management in strict accordance with ISO/IEC 17025:2005 standards, and are one of the important indicators of product quality. Electromagnetic compatibility measurement consists of test sites and test instruments. At present, in order to properly protect wireless communication and computer information control, major advanced countries in the world impose mandatory requirements on electromagnetic interference (EMI) generated during commodity operation or their own electromagnetic interference immunity (EMS) capabilities. For example, FCC in the United States, VCCI in Japan, C-Tick in Australia, CE Mark in Europe, BSMI in Taiwan, and CCC in China. Electronic information products that are about to enter the country must undergo application and testing before they can be imported and legally sold.