Hi Mike Don't panic! The test level is not as high as it seems. For a start, the test level of 3V is the open circuit generator output. Next, I guess that you could reasonably expect high interference levels in the 150kHz - 80MHz range after all, amongst other things, CB radio, taxi comms and radio controlled models are in this band.
I have been testing audio tuners and receivers for some years to EN55020 which calls up a similar test and not come across too many problems. If you ground the screens of your coaxial connectors (either directly or with 10nF, use simple filtering on your unscreened connectors and perhaps use a ferrite ring on your mains input then you shouldn't have a problem. I think the worst problem I had was with loudspeaker output connectors but this only took an hour or so to deal with. Regards Chris Colgan EMC & Safety TAG McLaren Audio Ltd mailto:chris.col...@tagmclarenaudio.com > -----Original Message----- > From: Price, Ed [SMTP:ed.pr...@cubic.com] > Sent: 17 November 1999 01:53 > To: 'emc-p...@ieee.org' > Subject: FW: EN61000-4-6 versus EN55103-2 > > > Posted for: mmur...@alesis1.corpusa.com > > > > > > > > > :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):- > ) > Ed Price > ed.pr...@cubic.com > Electromagnetic Compatibility Lab > Cubic Defense Systems > San Diego, CA. USA > 619-505-2780 (Voice) > 619-505-1502 (Fax) > Military & Avionics EMC Services Is Our Specialty > Shake-Bake-Shock - Metrology - Reliability Analysis > :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):- > ) > > > -----Original Message----- > > From: Mike Murphy [SMTP:mmur...@alesis1.corpusa.com] > > Sent: Tuesday, November 16, 1999 6:59 AM > > To: emc-p...@majordomo.ieee.org > > Subject: EN61000-4-6 versus EN55103-2 > > > > Folks, > > I could really use some wisdom from the group on this one. I have audio > > equipment that needs to pass this new set of immunity tests...well, > > they're > > new to me. The EN61000-4-6 "Immunity to conducted disturbances, induced > by > > > > RF fields" is called out in the product family standard EN55103-2. > > > > I'm struggling to understand why the interference signal level is so > high. > > > > As I read both standards, I believe the creators of the product standard > > > have either misinterpreted the test level guidelines or have just > created > > an unreasonable situation. > > > > Here are some background details: > > EN61000-4-6 Scope: gives the product committee (in this case EN55103) > the > > responsibility for the appropriate choice of the test and the severity > > level to be applied to the equipment. > > > > EN61000-4-6 Annex C "Guide for selecting test levels" > > Class 2 = 3V signal: Moderate electromagnetic radiation environment. > > Low-power portable transceivers (typically less than 1 W rating) are in > > use, but with restrictions on use in close proximity to the equipment. A > > > typical commercial environment. > > > > EN55103-3-2 has set the test level at 3V for the environments: > > residential, > > commercial and light industrial as well as urban outdoors with the test > > unit expected to meet performance criteria A. > > > > So, it looks like the standards people are telling me that in a normal > > commercial environment, I've got to be immune to the possibility of a > full > > > > 3V interference signal on my cables?!?! From what?!?! > > > > Does anyone else interpret this as unreasonable? > > > > Any constructive thoughts on what reasonable options are available to me > > is > > most appreciated. > > > > Thanks ahead of time, > > Mike Murphy > > Alesis Studio Electronics > > Santa Monica, CA USA > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > ===================================================== Authorised on 11/17/99 at 11:30:01; code 37f48bf31D62E742. The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. TAG McLaren Audio Ltd, The Summit, 11 Latham Road Huntingdon, Cambs, PE18 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
