Let me recode that sorry for the typos: The paddle must spin slow enough or stop and dwell - so that the test sample has time to respond to the peak field intensity. Since one doesn¹t know where in the chamber the peak is, only its amplitude, the rotation rate or dwell time must be such that the test sample response time is accommodated at every paddle position. This makes reverb testing take much longer than anechoic testing.
Ken Javor Phone: (256) 650-5261 From: Ken Javor <ken.ja...@emccompliance.com> Date: Sat, 04 May 2013 11:49:23 -0500 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Conversation: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? Subject: Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? He paddle must spin slow enough or stop and dwell, so that the test sample has time to respond to the peak fed intensity. Since one doesn¹t know where in the chamber the peak is, only its amplitude, the rotation rate or dwell time must be such that the test sample response time is accommodated at every paddle position. This makes reverb testing much longer than anechoic testing. Ken Javor Phone: (256) 650-5261 From: Pat Lawler <plawl...@gmail.com> Date: Sat, 4 May 2013 08:36:58 -0700 To: <owner-emc-p...@listserv.ieee.org> Cc: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? The issue of waiting to get the peak field intensity could be shortened by spinning the paddles at a higher speed. However, I wouldn't want to be inside a metal chamber with a 4'x8' metal plate spinning at 300 RPM. Sounds like an Edgar Allen Poe story -- 'The Plate In The Reverb Chamber'. Thanks to all who replied. This is a corner of EMC testing I've never been involved with. If EMC is called black magic by some, mode-tuned/stirred/stepped chambers sound like black magic^2. Pat On Mon, Apr 29, 2013 at 9:23 AM, Luke Turnbull <luke.turnb...@trw.com> wrote: > Hi all, > > Our experience is that you get pretty much the same levels with either a > reverberation chamber, or with high gain antennas in a regular anechoic > chamber. It is possible to increase the antenna gain by 3 or 4 dB compared to > ³traditional methods², and get up to the same levels achieved in a > reverberation chamber. Our methods achieve a minimum 3000 V/m, 1-18 GHz in a > regular anechoic chamber. > > Luke Turnbull > > Dr Luke Turnbull > EMC Technical Manager > TRW Conekt > Stratford Road > Solihull > West Midlands B90 4GW > United Kingdom > > Tel: +44 (0)121.627.3966 <tel:%2B44%20%280%29121.627.3966> > > email: luke.turnb...@trw.com > web: www.conekt.co.uk <http://www.conekt.co.uk/> > > > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Ed Price > Sent: 28 April 2013 17:53 > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: RE: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? > > <snip> > > > You can take advantage of the multiple reflections in a chamber (actually > enhancing the reflections through the use of the moving mechanical structures) > to achieve higher E-fields. This allows you to get higher E-fields for a test > like RS103 than you could get using traditional methods. > > <snip> > > > Ed Price > WB6WSN > Chula Vista, CA USA > > From: Pat Lawler [mailto:pat.law...@verizon.net] > Sent: Sunday, April 28, 2013 7:38 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? > > > All, > > > > Over the years, I've come across pictures of test chambers with descriptions > such as mode-stirred, mode-turned, and reverberation. They seem to look > similar, with metal walls and rotating metal paddles. > > > > Do these names reference the same basic design, or are they different animals? > Which ones are used for which type of RF immunity test? > > > > Thanks, > > Pat Lawler > > Teset engineer > > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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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://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 <emcp...@radiusnorth.net> > 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. 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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://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 <emcp...@radiusnorth.net> 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://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 <emcp...@radiusnorth.net> 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://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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
