The picture I have in my mind is that there's a (or several) relatively small hot spot(s) - you could say will-o'-the-wisp(s) - that dart around the test chamber as the paddles move. Therefore my understanding is that a large system isn't simultaneously illuminated by the reverb method.
Luke Turnbull From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Ken Javor Sent: 04 May 2013 17:52 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? 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 doesn't 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<mailto:ken.ja...@emccompliance.com>> Date: Sat, 04 May 2013 11:49:23 -0500 To: <EMC-PSTC@LISTSERV.IEEE.ORG<mailto: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 doesn't 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<mailto:plawl...@gmail.com>> Date: Sat, 4 May 2013 08:36:58 -0700 To: <owner-emc-p...@listserv.ieee.org<mailto:owner-emc-p...@listserv.ieee.org>> Cc: <EMC-PSTC@LISTSERV.IEEE.ORG<mailto: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<mailto: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 "traditional methods", 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<mailto:luke.turnb...@trw.com> web: www.conekt.co.uk<http://www.conekt.co.uk> <http://www.conekt.co.uk/><http://www.conekt.co.uk/> From: emc-p...@ieee.org<mailto: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<mailto: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<mailto: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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