How to quickly screen for EMC in concentrator pre-testing?

EMC pre-testing during product development can identify potential problems early. Rapid screening requires simple yet effective tools and methods. Conducted emissions pre-testing: Measure conducted emissions at power ports in a laboratory power environment using a Line Impedance Stabilized Network (LISN) and a spectrum analyzer with quasi-peak detection. Radiated emissions pre-testing: Scan the 30MHz-1GHz band with a broadband antenna and spectrum analyzer in a room with moderate shielding or using a GTEM chamber. Immunity pre-testing: Perform simplified immunity tests using a portable EFT/surge simulator, ESD gun, and RF signal generator with an amplifier and antenna. Near-field scanning kits are particularly useful for locating noise sources. The key to pre-testing is establishing internal judgment criteria (e.g., 3dB stricter than official limits) and recording all test data and observations.