Hi, Form CISPR 22 Section 7.2.2 "Subsequent test are necessary from time to time on equipment taken at random from production."
>From past experience both in EMC labs and manufacturing, it looks that big >companies that can afford an EMC facility and/or have a dedicated compliance >person usually do EMC production control. Smaller companies usually do not. For emissions I have seen a common practice to try to pass with more than 3 or 4 B margin during the compliance test to avoid any measurement uncertainty and differences on production units. Not too much on the immunity side. Practically, we do test on production units and get still get surprises from time to time although the whole design/production/compliance process is very well controlled. So in my opinion you should always do testing on production control. Sincerely, Dieter Paasche Product Developer, Electrical R & D CHRISTIE 809 Wellington Street North Kitchener, Ontario N2G 4Y7 Phone: 519-744-8005 Ext 7211 Fax: 519-744-9255 www.christiedigital.com<http://www.christiedigital.com/> This e-mail message (including attachments, if any), is confidential. Any unauthorized use, distribution or disclosure is prohibited. If you have received this e-mail message in error, please notify the sender by reply e-mail or telephone and delete it and any attachments from your computer system and records From: Luke Turnbull [mailto:[email protected]] Sent: Thursday, July 11, 2013 5:35 AM To: [email protected] Subject: [PSES] Production Assurance Tests for EMC Dear Group, I have familiarity with how the aerospace and automotive industries deal with testing and manufacture of systems, but am less familiar with products tested to commercial standards. What is the custom and practice for demonstrating continued compliance to EMC requirements for products that are in production for a long time? I assume that over time, the construction of e.g. capacitors may change - leading to different stray characteristics, even for the same manufacturer and component value; and that IC's may be functionally similar, but again have a different internal construction. Do system suppliers generally re-test for EMC when components become obsolescent? Do system suppliers generally re-test periodically in case components have been unknowingly changed, or in case production processes have been changed without considering their effect on EMC compliance? Thanks for your help. Dr Luke Turnbull EMC Technical Manager TRW Conekt Stratford Road Solihull West Midlands B90 4GW United Kingdom Tel: +44 (0)121.627.3966 email: [email protected] web: www.conekt.co.uk - ---------------------------------------------------------------- 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]<mailto:[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]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[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]>
