Your philosophy is mine but for one thing: It's not because a product cannot meet requirements as put on the market that it should be excluded ..
It could for example be sold in an enclosure, so as to meet ESD requirements. It's not a absolute requirement for these board to be sold as a bare PCB. It has consequences for the prices of course but that is valid for each device, not for development boards only. And it is not because you can touch a chip, that it need to be tested. Standards speak about likely to be touched in normal use. Connector internal pins on my Ipad are accessible too, but most standards do not include them for ESD testing. It may be wise to do so, but that is another story. BTW did anyone obtain a satisfactorily answer from Farnell or any other seller ? Your opinion about the EC in these, in casu their authors, is not mine. EC texts do generally excel in quality, what need not be the same as clear to us, or in line with our needs. Note that they are addressed to the member states and their legal advisors and not to the end users. If unclear on a special subject, than it certainly is the case because the subject is not well enough defined, or it would open a way to avoid requirements by what i call smart naming or smart selling. Regards, Ing. Gert Gremmen, BSc g.grem...@cetest.nl www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. -----Oorspronkelijk bericht----- Van: Piotr Galka [mailto:piotr.ga...@micromade.pl] Verzonden: Monday, November 04, 2013 6:23 PM Aan: EMC-PSTC; ce-test, qualified testing bv - Gert Gremmen Onderwerp: Re: [PSES] EMC requirements for developer/evaluation boards Hi Gert, > To Piotr: ESD test are normally carried out on enclosure and connector > shielding, not to internal circuits. > HCP and VCP discharge are designed for this. > My logic is: The idea of ESD test is to check possible events which can happen in normal use of device. The possible source of ESD are human fingers. Human fingers touches enclosure and not internal circuits because enclosure is between fingers and internal circuits. So ESD is tested on enclosure and on HCP and VCP = all expected ESD that can happen to and near device. If device has plastic enclosure than in real ESD to something near device has higher probability than to device (which is close to 0%). If there is no enclosure than human fingers can touch directly internal circuits so following the idea of testing all possible ESD events in my opinion ESD should be also tested to internal circuits. I think that for such device the ESD to internal circuits has much higher probability than to something near (HCP and VCP). There is no idea to testing something less probable and not testing something more probable. If the prototype board is to be used only in ESD protected environment than testing ESD to internal circuits can have no sense but testing ESD to HCP and VCP also has no sense. But generally I think that prototype board should be excluded from EMC at all and it should be written in the first EMC directive version long time ago. When I first time read EMC (in 2002 - two years before we (Poland) joined EU) the question about prototype board was my first thought. Being not clear solved in directive that subject makes me to have clear opinion about its authors. Best Regards Piotr Galka - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
