----- Original Message ----- From: "John Woodgate" <[email protected]>
> In the early days of the old Directive, it was considered that educational > products did not have to be tested but that Article 4 applied: if > interference occurred it must be prevented. > > I don't see anything about this in a quick scan of the current Directive > or its guidelines, but I think it should be obvious that educational > products have to be treated as a special case. Maybe they are not > 'apparatus' as defined in the Directive, as they are not 'finished > appliances'. Thank you John. In 2002 my conclusion about old Directive was that _ONLY_ products destined for EMC education can be not tested, as they must violate EMC to show EMC problems. All others should be tested (I don't know where from my conclusion comes). It is why I gave up those days. I am mainly a designer. My target is to spend 90% time designing, and 10% reading all about EMC, LVD, ROHS,..... and standards. Because of this I can't be well oriented in any of them. I have read the ROHS/WEEE interpretation where 'finished appliances' were discussed based on the question if they have end user needed function. In my understanding education PCB has end user needed function - education. It has not its special case, but it will newer have such case (it is not the module used as part of other apparatus). My problem is if it is in the EMC scope. The basestation for this PCB models has its case and I think is 'apparatus'. The generator I have described is in that basestation. But the 15cm unshielded wire is used only when PCB model is used. The basestation will be well ESD protected. Do I have to use this 15cm wire when testing basestation, or test it with model not needing generator, or needing 10Hz sinus, or without any model ? Selecting test that way is certainly not the right way. There are such systems on the market, and I'm sure use unshielded cables. What is the way I don't know. May be 3MHz TTL at such wire is well under the emission levels, but I don't think so. Where should I ask my questions to have the problem solved once for always? Piotr Galka - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
