EMC = EMI + EMS EMI (electromagnetic interference) can be divided into: 1. Radiation (Radiation): Space Radiation (Chamber) / power radiation (Clamp) / open field test (Open site) 2. Conduction (Conduction) 3. Power Harmonic wave (Harmonic) 4. voltage flicker (Flicker) EMS (electromagnetic tolerance) can be divided into: 1.ESD (anti-static radiation testing) 2.EFT (resistance to impulse noise test) 3.SURGE (resistant to lightning surge test) 4.RS (resistant to RF radiation testing) 5.CS (RF conduction resistance test) 6.Magnetic Field (resistance to power frequency magnetic field test) 7.DIP (resistant to voltage fluctuation test) 8. resistant to interference ac conductivity of low-power input 9. dc resistance to 150KHz continuous conductive interference