Scott Standard practice for EMC test labs is to test what is presented us and if a component needs to be added or changed to make the product EMC compliant we note the make, model and location of what was changed or added. The safety implications of the EMC change is usually not addressed. We will try to use recognized components for fixes in the power supply for instance, but not necessarily - a ceramic disc capacitor of some value may solve an EMC problem but may not be adequate for meeting safety requirements regarding size, form factor, temperature characteristics, etc. The safety implications of the fix are generally left up to the manufacturer.
Tom Cokenias T.N. Cokenias Consulting P.O Box 1086 El Granada CA 94018 tel 650 726 1263 fax 650 726 1252 On Mar 13, 2013, at 10:08 AM, Ed Price wrote: > Scott, what is a “critical component?” > How would I recognize one? > Would it be proper for me to tear open a product to look for these devices? > > Ed Price > WB6WSN > Chula Vista, CA USA > > From: Scott Xe [mailto:[email protected]] > Sent: Wednesday, March 13, 2013 8:49 AM > 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]>
