Fundamentally, a loop is potentially more accurate than a rod, because the use of a rod with the 51.5 dB conversion factor is valid only in the far field, and the (inner) boundary of the far field is not well-defined, especially on real test sites. Below about 10 MHz, the boundary of the far field may be too far away from the EUT for measurements to be practicable. Note that the formula 2D^2/lambda is valid only for D>>lambda, and for a broadside array.
With best wishes DESIGN IT IN! OOO Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Ken Javor [mailto:[email protected]] Sent: Tuesday, February 28, 2017 3:04 PM To: [email protected] Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General Use] But there was a technical reason for doing so. Not saying right or wrong, because don't have direct experience, but the reason for making loop measurements to an electric field requirement was because there was a prejudice against using a rod antenna, because they felt the loop made more accurate measurements. Again, not saying it was the right thing to do, only it was done intentionally, understanding all the issues. Ken Javor Phone: (256) 650-5261 > From: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]> > Reply-To: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]> > Date: Tue, 28 Feb 2017 11:37:43 +0100 > To: <[email protected]> > Conversation: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General > Use] > Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General > Use] > > Many standards express the limits for magnetic field measurements in dBuV/m, > so in E-field. Most also indicate the relation of 51.5 dB to be added > to convert H-field into E-field , ignoring close field effects. > The 60 cm loop is an old beast, and so are test conventions. > > > Regards, > > Ing. Gert Gremmen > Approvals manager > ------------------------------------------------------------------------------ > ------ > > > + ce marking of electrical/electronic equipment > + Independent Consultancy Services > + Compliance Testing and Design for CE marking according to EC-directives: > - Electro Magnetic Compatibility 2014/30/EC > - Electrical Safety 2014/35/EC > - Radio & Telecommunication Terminal Equipment 99/5/EC > > Web: www.cetest.nl (English) www.ce-test.nl (Dutch) www.cetest.fr (under > construction) > Phone : +31 10 415 24 26 > ------------------------------------------------------------------- > This e-mail and any attachments thereto may contain information > that is confidential and/or protected by intellectual property rights > and are intended for the sole use of the recipient(s) named above. > Any use of the information contained herein (including, but not > limited to, total or partial reproduction, communication or > distribution in any form) by persons other than the designated > recipient(s) is prohibited. If you have received this e-mail in error, > please notify the sender either by telephone or by e-mail and > delete the material from any computer. > Thank you for your co-operation. > > > -----Original Message----- > From: John Woodgate [mailto:[email protected]] > Sent: Tuesday 28 February 2017 10:38 > To: [email protected] > Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General > Use] > > Should be easy to meet any limits using that technique! > > With best wishes DESIGN IT IN! OOO Own Opinions Only www.jmwa.demon.co.uk J > M Woodgate and Associates Rayleigh England > > Sylvae in aeternum manent. > > > -----Original Message----- > From: Cortland Richmond [mailto:[email protected]] > Sent: Tuesday, February 28, 2017 9:25 AM > To: [email protected] > Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General > Use] > > On 2/27/2017 11:58 PM, Brent DeWitt wrote: >> Agreed Ken. In this case the e-field conversion is irrelevant, and >> the specified antenna factor is what it is. > > I have to concur. I am recalling issues with the FCC's insistence on > measuring the E-field of Access BPL emissions with a loop antenna. > > Cortland Richmond > > - > ---------------------------------------------------------------- > 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]> > > - > ---------------------------------------------------------------- > 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]> > > - > ---------------------------------------------------------------- > 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]> - ---------------------------------------------------------------- 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]> - ---------------------------------------------------------------- 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]>
