How to pass the EMC test for power line communication of a PLC?

Comprehensive preparation and optimization are required for passing EMC testing of power line communication PLCs. Before testing, confirm that the product conforms to design specifications and conduct pre-testing. Test items include conducted emissions, radiated emissions, electrostatic discharge, surge, and electrical fast pulse. For items that may exceed limits, prepare rectification plans, such as adding filtering or shielding. During testing, communicate with the test engineer to understand the details of any failures. Common passing techniques include selecting an appropriate operating mode to avoid full load during testing. After passing the test, obtain the test report and certificate for market access. Systematic preparation can increase the first-time pass rate to over 80%.