To demonstrate compliance of a computer option board with the EMC Directive, EN 55022/A1 allows testing in a single compliant host for emissions. Immunity testing is another matter, with the lack of a harmonized ITE immunity standard. Is there any consensus or opinions on the appropriate immunity testing on, for example, a video graphics adapter? Using the generic residential immunity standard (EN 50082-1:1992), my take would be ESD to 8 kV air, 4 kV contact, in the vicinity of the output connector. However, assuming video cabling to be typically short (<3m) EFT testing would be performed only on the host computer's AC input and RF immunity on the system. These latter tests seem to be of limited value at best, but I cannot locate rationale for their exemption. Any thoughts from the forum?
Doug Frazee EMC Compliance Engineer Alliant Techsystems, Inc. Advanced Technology Applications 401 Defense Highway Annapolis, Maryland 21401 USA Tel: (410) 266-1793 FAX: (410) 266-1853 [email protected]
