KH3961 is an automatic EMI receiver. It is a main test system for EMI (Electro Magnetic Interference) testing. The KH3961 is produced by the full closure structure and strong electro-conductibility material, which has high shielding effect. Due to the new technology for the EMI Test System, it solved the instrument self-EMI problem. The test results are according to the international format test report. The EMI Test System KH3961 fully meets CISPRl6-1, GB17743, FCC, EN55015 and EN55022.