Indeed !!! and that is why EMC Design Engineers and Consultants continue to be employed. We know the "magic" and how to deploy it. A few are better than most the others, but that is the challenge, finding the ones that know the proper incantations to invoke for a first time pass, or at least a second pass. Test labs just tell you that the product has failed the requirements, and provide some data. The engineering folks have to guess from that data just what in the hell has happened. If they had a problem in the first place, means that they are not qualified to figure out what has failed. Call in a consultant... he is most likely a retired Test Engineer and has lot of experience with ferrites and copper tape. But if that gets you under the limits - great!! Or call in an EMC Design Engineer. They fix things on the pcb's and schematics. It's not cheap, but it sure goes right to the source of problem and also fixes SI, signal integrity. Your design can start at 10 MHz and ship at 200MHz with no changes to the layout. The same applies today with the proper scaling as mentioned by Dr, Howard Johnson of the "black magic" books.
>________________________________ > From: Scott Xe <[email protected]> >To: Anthony Thomson <[email protected]>; [email protected] >Sent: Thursday, March 14, 2013 9:25 AM >Subject: Re: [PSES] Critical component in EMC report > > >Re: [PSES] Critical component in EMC report >Thanks for all responded! For large companies, they may have test facilities >and knowledgeable engineers to vary their products before sending to 3rd part >lab for verification/certification. For medium and small companies, they have >no test facilities and the engineers who may not have got the professional >training in EMC requirements rely on the 3rd party lab for spotting out the >failures and the advice for problem fixing. Dealing with such companies would >be at risk as the test report may not help them too much. > >Regards, > >Scott > >On 14/3/13 4:40 PM, "Anthony Thomson" <[email protected]> wrote: > > >Scott, >> >>EMC compliance is the sole responsibility of the manufacturer (or whoever >>places the product on the market). It’s entirely up to you how you control >>ongoing compliance (or not). >> >>T >> >> >> >> >>>----- Original Message ----- >>> >>>From: Scott Xe >>> >>>Sent: 03/13/13 03:48 PM >>> >>>To: [email protected] >>> >>>Subject: [PSES] Critical component in EMC report >>> >>> >>>It is common not to have critical component list in EMC reports issued from >>>3rd party laboratories. Those information are essential to track if the >>>correct parts to be used in mass production. What is main reason not to >>>have it as a common practice in the field? >>>> >>>>Thanks and regards, >>>> >>>>Scott >>>> >>- >>---------------------------------------------------------------- >> >>This message is from the IEEE Product Safety Engineering Society emc-pstc >>discussion list. To post a message to the list, send your e-mail to >><[email protected]> >> >>All emc-pstc postings are archived and searchable on the web at: >>http://www.ieee-pses.org/emc-pstc.html >> >>Attachments are not permitted but the IEEE PSES Online Communities site at >>http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used >>formats), large files, etc. >> >>Website: http://www.ieee-pses.org/ >>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]> >> >> - >---------------------------------------------------------------- > >This message is from the IEEE Product Safety Engineering Society emc-pstc >discussion list. To post a message to the list, send your e-mail to ><[email protected]> >All emc-pstc postings are archived and searchable on the web at: >http://www.ieee-pses.org/emc-pstc.html >Attachments are not permitted but the IEEE PSES Online Communities site at >http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used >formats), large files, etc. >Website: http://www.ieee-pses.org/ >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]> > > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ 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]>
