Greetings colleagues,
With the responses so far - 1. If there has been a misinterpretation of the standard to state that it is acceptable to have such metal as copper or aluminum on the table top during the test, I will need to further investigate and get to the root of where or how that interpretation came to be. It would be helpful someone can direct me on how or who to direct my inquiry to someone on the committee for IEC 61000-4-9 to clarify if this "non-conductive" material means to be a "non-magnetic conductive" material in the standard. Or maybe to confirm, that no conductive material is to be placed on the table top, and the table is to made of non-conductive material, i.e. wood or foam. 2. For me, "magnetically conductive" material means to have high permeability. 3. I don't have earlier versions of the standard IEC 61000-4-9:2016, so I don't know for sure or confirm if the ground reference plane under the table is no longer needed. These are good insights and I appreciate everyone's contribution. Hopefully, we'll have a few more inputs. Thank-you, Richard Georgerian Applications Engineer From: [email protected] <[email protected]> On Behalf Of Brent DeWitt Sent: Monday, May 13, 2019 4:37 PM To: [email protected] Subject: Re: [PSES] IEC 61000-4-9: Section 7.3 - use of a non-conductive table Hi Richard, I'm assuming that by "magnetically conductive" you mean having a significant permeability. That's certainly a concern, but when you introduce a conductive but non-magnetic material in to the field, there is an opportunity for it to act as a shorted turn on the system, so keep conductive bits small. Best regards sir! Brent (headed home to Colorado) DeWitt From: Richard Georgerian <[email protected] <mailto:[email protected]> > Sent: Monday, May 13, 2019 4:37 PM To: [email protected] <mailto:[email protected]> Subject: [PSES] IEC 61000-4-9: Section 7.3 - use of a non-conductive table Greeting colleagues, In IEC 61000-4-9, Section 7.3 it states the following - "Table-top EUT's shall be placed on a non-conductive table." Up until now, I have always thought that "non-conductive" had meant no metals, such as iron, steel, aluminum, copper, etc. In that meaning, the table would then be made of wood, foam, etc. However, I have been advised that for this particular case of impulse magnetic field immunity test, that "non-conductive" is referring to material that should not be magnetic conductive, such as aluminum or copper. Iron and steel would not be used, as these are considered magnetic conductive. And therefore, an aluminum or copper sheet would be placed on the table under the EUT. The standard does not provide guidance as to the use of "non-conductive" that would mean in essence, "should not be magnetic conductive". Any guidance and insight would be most helpful. Thank-you, Richard Georgerian Applications Engineer - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.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] <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://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.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://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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
