How to balance the cost and effectiveness of EMC rectification for edge boxes?

Edge computing box EMC rectification often faces cost pressures. The principle of balancing is prevention first. Investing 1 yuan before testing is equivalent to 10 yuan of rectification after testing. During rectification, the priority should be to suppress at the source, block the path, and strengthen the affected end. Source suppression, which is to add ferrite beads (PBZ1608E600Z0T) and capacitors near the chip power supply, has the lowest cost and best effect. Path blocking, which is to add common mode inductors (CML3225A-510T or CMZ2012A-900T) at the interface, has a moderate cost. Strengthening the affected end, such as adding shielding covers and conductive foam, is more expensive and should only be used when the first two are ineffective. EMC component selection guidelines and simulation models provided by Echotech can be used to accurately invest in the design stage and avoid over-design. At the same time, cooperation with certification bodies for pre-testing to locate out-of-limit points and targeted rectification case studies show that following this principle, the total cost of edge box EMC components can be controlled within 2% of the BOM and the first-time pass rate exceeds 90%.