Screening effectiveness and transfer impedance Installing (N)EMP protection or other feed-through components into shielded rooms, is affecting the rooms screening effectiveness. The negative effects to the shielding performance of the room can be optimised by adjusting the feed through components material and plating to the shielded rooms filter wall. (N)EMP protected fix installation RF line PoE (N)EMP protector Power line Farady cage Protected equipment To verify the screening effectiveness or screening attenuation and to identify the best possible method to install (N)EMP protectors or other coaxial feed through components HUBER+SUHNER has carried out a series of transfer impedance measurements acc. to IEC 62153-4-10 1. The test series was performed with a combination of different test specimens which simulate various installation approaches, various sample materials with different plating and various installation wall materials. The target was to find the combinations which result in the lowest and most stable transfer impedance Variation of test specimens and installation wall materials • Feed-through housing materials: brass and aluminium • Plating materials: SUCOPLATE® 2 , black silver, black chrome , gold, aluminium not plated • Feed-through designs: 1-hole flange with and without RF sealing (V-groove washer) 4-hole flange • Wall materials: stainless steel, copper, aluminium 1EC 62153-4-10 “Metallic communication cable test methods – part 4-10: Electromagnetic compatibility (EMC) – shielded screening attenuation test method for measuring the screening effectiveness of feed-throughs and electromagnetic gaskets double coaxial method” 2 SUCOPLATE® (CuZnSn) 155
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