The issue of artifical limits has come up before. Refer VCCI to their own document. The also have the 80/80 statistical limits that CISPR has in their documentation, along with requirements for production line tests. There are no additional mandatory limits in their requlations. If they aren't there they can't impose them (they certainly try often enough and can often be successful but that still doesn't give them any legal authority to do so. Germany tried that for awhile, but I believe has finally gotten that idea beat out of them. Incidentially, even with the 80/80 and other production run tests, I would recommend that you have some corporate direction on what passing really is, a 3 dB or so internal limit is certainly reasonable, but you'll have to have a decision on what you do if you don't meet that internal limit. (Some of your customers may also have something to say on that HP for example generally requires an addtional 3dB 80/80 limits - or atleast the division I have worked with did and they put it into the purchase specifications. Gary
-----Original Message----- From: John Juhasz [mailto:[email protected]] Sent: Tuesday, August 03, 1999 10:08 AM To: 'Muriel Bittencourt de Liz'; Lista de EMC da IEEE Subject: RE: EMC & Safety Standards Muriel, I will only respond on the VCCI issue as others have covered the product safety issue well. The VCCI (Voluntary Control Council for Interference of ITE Equipment)limits are based on the CISPR 22 (EN 55022) limits, with Class A & Class B categories. In my experience with VCCI has shown that although mandatory limits are specified, 'margins' are required. For example, if the limit is 40dBuv, VCCI members would prefer to see a margin of 6dB or 34dBuv. In essence they lower the limit and that's what you have to meet in order for your equipment to be deemed acceptable. The reason for this (as I had been told by a VCCI member company - who I will not name) is that during the manufacturing process of a product, a cable shield may inadvertantly not get grounded, or an ECO (Engineering Change Order) meant to reduce emissions may not get implemented on a specific lot of products, etc. . . therefore the product still has a chance in being compliant. Hope this helps. John A. Juhasz Product Qualification & Compliance Engr. Fiber Options, Inc. 80 Orville Dr. Suite 102 Bohemia, NY 11716 USA Tel: 516-370-1324 Fax: 516-567-8322 -----Original Message----- From: Muriel Bittencourt de Liz [ mailto:[email protected] <mailto:[email protected]> ] Sent: Monday, August 02, 1999 2:43 PM To: Lista de EMC da IEEE Subject: EMC & Safety Standards Dear Group, I'm making a study on EMC & Safety Standards, and some questions appeared. I'd like to post them to the group to see if someone can help me. The questions are: # Safety standards seem only to aim the protection the equipment... And the operator/user of the equipment? Is there any standard for protection of the user/operator? # The VCCI Standard is more restrictive than the European Norms (ENs)?? # Is there any standard which covers the effects of Non-Ionizing Radiation (Electromagnetic Radiation) on the human health? I think that's all... Thanks in advance for those who can help! Best Regards, Muriel -- ====================================================================== Muriel Bittencourt de Liz GRUCAD - Grupo de Concepção e Análise de Dispositivos Eletromagnéticos Universidade Federal de Santa Catarina Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL Fone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: [email protected] ICQ#: 9089332 --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
