ELECTRICAL CONTACT RESISTANCE BETWEEN FLAT METAL SURFACES.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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Low-voltage d-c contact resistance, similar to that in seams and door closures for electromagnetically shielded rooms, was measured between flat specimens of metal with overlap areas between 1 and 20 sq mm also, some rf impedance measurements were made. Contact resistance and reactance is plotted against normal force, and the results are compared with theory. It was found that salt-air exposure of metals electrolytically plated with zinc, cadmium, or chromium produced surface films which could not be penetrated by normal pressures up to 500 gramssq mm and wiping distances to 1 mm. A sulfur-dioxide atmosphere had negligible effect on the contact resistance of most specimens. Author
- Electrical and Electronic Equipment