The power supply was probably not designed to _filter_ EFT signals, which can range up to 50MHz. Since power supplies are typically low frequency devices (as compared to 50MHz signals), it make sense that it was unaffected.
Try using high frequency ferrite cores on the AC and DC lines. The cores may also may help reduce radiated emissions. On Mon, 22 Oct 2001 11:22:50 +0100, Alex McNeil <[email protected]> wrote: >I am at an EMC test centre today and tomorrow. Unfortunately, my product >failed EFT testing on the AC power port at 1KV. This is for various >combinations of Line, Neutral and Earth (L, N, E, LN, LE, NE and LNE) > >My product is Class II, no Earth. It is supplied by an external power >supply. This supplies SELV to my product. The power supply manufacturer has >stated that his power supply meets EN61000-4-4 for 2KV and has emailed me >this report to verify this. > >Has anyone got a quick solution to my problem so that I can implement here >at the EMC test house? > >Kind Regards >Alex McNeil >Principal Engineer >Tel: +44 (0)131 479 8375 >Fax: +44 (0)131 479 8321 >email: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
