Most of the "front" text states that these are the minimum requirements to place a product on the market. If a product is designed to meet only the minimum requirements to be placed on the market ... Well, if the sales and volumes are not good, - due to minimal performance ... loser ! Every product that management has pushed to ship by meeting minimum requirements, has come back to be redesigned to better meet the requirements with more margin. Twice the engineering costs and twice the approvals cost and twice the delay in marketing, and a poor reputation in the market for free !! Not counting the doubling of costs to make a comeback. Test everything, short or long, and test to higher levels to find the margins to failing. For example, A product met the ESD tests as designed. but in the field it failed ESD. Customer was negatively impressed and made sure we knew that ! The fix, really cheap and easy, made the product immune to all the ESD tester could do !! 30 kV all day long, directly on the contacts, no problem. EMC is cheap and easy when applied correctly. But there are some that will make it, EMC, out to be some sort of black magic that is real mystery to solve. When it is not, and can be solved and fixed rather easily. So test to the hardest standards that you can apply and make it work with that !!!
From: Rajneesh Raveendran <rajneesh.raveend...@seagate.com> To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Wednesday, January 13, 2016 11:10 PM Subject: Re: [PSES] Generic EMC Precedence over Basic Standards and Fast Transient and Surge Immunity Questions Hi Philip, The precedence is EMC product standards --> Generic EMC standards --> Basic EMC publications. The Basic EMC publications act as building blocks for Generic EMC standards & EMC Product standards. The Generic EMC standards act as building blocks for EMC Product standards. You can get more info at the link - http://www.iec.ch/emc/basic_emc/ Regards,Rajneesh On Thu, Jan 14, 2016 at 6:49 AM, Philip Stevenson <pw...@hotmail.co.uk> wrote: Dear List Members The Generic EMC Immunity Standard BS EN/IEC 61000-6-1 references a number of "Basic Standards" which are associated with each of each of the EMC Immunity Test Requirements. I have been advised that the Generic EMC Immunity Standard BS EN/IEC 61000-6-1 test requirements have precedence over the referenced "Basic Standards". Is this correct? My reason for asking relates to the Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Surge and Fast Transient Immunity Test Requirements for a DC Power Input of a product. This test requirement references "Basic Standards" IEC 61000-4-5and IEC 61000-4-4 in Table 3. The following questions relate to a product which is powered from a 28V dc output from a 230V ac Mains Powered COTS DC Power Supply. Surge Immunity Question: The Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Table 3 Surge Immunity Test Requirement refers to Basic Standard IEC 61000-4-5. As previously stated the Product is powered from a 28V dc output from a 230V ac Mains Powered COTS DC Power Supply via a shielded cable assembly which is less than10 metres in length. In the Basic Standard IEC 61000-4-5: 2014 Section 7.6 it states that "No test shall be required for cables according to the manufacture's specification are less than or equal to 10 metres." Whereas the Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Surge Immunity Test Requirement caveat "c" states that "Apparatus with a DC power input port intended for use with a AC-DC Adaptor shall be tested on the AC power input to the AC-DC Adaptor". As the products DC power input cable assembly is shielded the Basic Standard implies no testing is required. Whereas the Generic EMC Immunity Standard implies the AC power input to the COTS DC Power Supply needs to be tested. My question is which of these test requirements has precedence? Fast Transient Question: The Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Table 3 Fast Transient Immunity Test Requirement caveat "d" states that "Apparatus with a DC power input port intended for use with a AC-DC Adaptor shall be tested on the AC power input to the AC-DC Adaptor". I have been advised that the Fast Transient Immunity test needs to be performed on the DC Power Input cable. My question again is which of these test requirements has precedence? I would be grateful for any advise or guidance the members can provide on these matters. If you prefer to reply to me be directly instead of via the list my personal Email address is pw...@hotmail.co.uk. Regards Philip Stevenson - ---------------------------------------------------------------- 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.htmlAttachments 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.htmlFor help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org>For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - ---------------------------------------------------------------- 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.htmlAttachments 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.htmlFor help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org>For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - ---------------------------------------------------------------- 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>