Alex, make sure you investigate whether or not energy is coupling to other cables of the EUT and causing problems. In other words, try to reduce the system (remove cables) and see if the EFT failures persist. If you can't remove a cable due to functionality, place ferrites on it instead (near the EUT). You may be surprised how a failure manifests itself. Sometimes you've got to back up and take a look at the forest... :)
Good luck... Paul Hare e: ph...@pirus.com Compliance Engineer w: 978.206.9179 Pirus Networks f: 978.206.9199 43 Nagog Park c: 508.450.0376 Acton, MA 01720 i: www.pirus.com -----Original Message----- From: am...@westin-emission.no [mailto:am...@westin-emission.no] Sent: Wednesday, October 24, 2001 4:04 AM To: emc-p...@majordomo.ieee.org Subject: SV: EFT Failures..Update! Alex, What happened during the burst test ? Did the EUT break down or did you only have minor disturbances/faults during the test ? I assume that you know that EFT/bursts usually is a performance criteria B test, which means that temporary faults are accepted during the test, as long that the EUT is self-recoverable after the test. Amund -----Opprinnelig melding----- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av Alex McNeil Sendt: 23. oktober 2001 10:44 Til: 'emc-p...@majordomo.ieee.org' Emne: EFT Failures..Update! Hi Group, THANKS for your very much appreciated responses!! I was in panic mode!! I thought it would be appropriate to let you know the status. My product is a small all plastic enclosure Point if Sale (POS) Class III terminal. It has an external SMPS, Class II, no earth, supplying SELV, 12Vdc 1.5A to my product. The power supply works OK with some of our other products, for EMC. The problem is with my product. I solved the problem at the test house by wrapping a few turns of the DC PSU cable through a "Large" Ferrite Clamp at the Product input (it did not work so well at the PSU I/P nor O/P). The fix cannot be considered final due to obvious reasons. I am now at my Lab, now the serious diagnostics begin. I have been trying various "quick fixes" to no avail i.e. Caps, TVS, MOV etc. If you have any further comments feel free to email me. THANKS again to all those who responded with their thoughts. I can tell you they were wide and varied just as you would expect to trying to resolve an EMC problem over the NET!! Best Regards alex.mcn...@ingenicofortronic.com > -----Original Message----- > From: Alex McNeil > Sent: 22 October 2001 11:23 > To: emc-p...@majordomo.ieee.org > Subject: EFT Failures..Help! > > Hi Guys, > > 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: alex.mcn...@ingenicofortronic.com > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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