How can the shielding effectiveness of the PMS (Power Measurement System) housing be guaranteed?

The shielding effectiveness (SE) of the PMS metal enclosure directly affects its radiated emission and radiated immunity performance. Ensuring SE requires attention to materials, structure, and continuity. Material selection: The main body of the enclosure should use highly conductive materials, such as galvanized steel (SE>60dB at 1GHz). Avoid using non-conductive plastic enclosures or conductive coatings. Structural design: Minimize openings and gaps. Necessary ventilation holes should use honeycomb metal ventilation panels (hole diameter <λ/10). Electromagnetic sealing gaskets (such as conductive foam or metal springs) should be used at the joints between the panel and the enclosure to ensure electrical continuity. Multi-point latches and conductive gaskets should be used between the door and the enclosure. All cable interfaces must use connectors with filtering functions or metal through-core capacitors, ensuring 360° connection. Internal mounting plates should be reliably connected to the enclosure via conductive posts. During processing, joints should be continuously welded, avoiding excessively large spot weld gaps. Through design, the shielding effectiveness of the PMS enclosure in the 30MHz-1GHz frequency band should be greater than 40dB, which can effectively suppress internal noise radiation and block external radio frequency interference.