HI Wendy, your chamber size is fine: we have successfully verified chambers smaller than this.
I suggest a few things: Don't scrimp on the size of the floor patch. If you are using wood to hold your field probe, change to plastic. Don't let the probe get near any dielectric material. Make sure the probe always stays in the same orientation If you are trying to calibrate at low fields: don't. You must make sure your field probes give sensible numbers at all times. Make sure your power meters and amplifiers are linear over the calibration range. Make sure you are allowing the power meter time to settle. Use the smallest antenna that will cover your frequency range. Offset the antenna and UFP a little off centre if you can, a slight angle helps. Use good software. Now, if these dont work, you might need outside help. Sincerely, Derek Walton L F Research. -----Original Message----- From: WNya <[email protected]> To: Julian Jones <[email protected]> Cc: Charlie Blackham <[email protected]>; <[email protected]> <[email protected]> Sent: Tue, Sep 27, 2011 9:48 am Subject: Re: [PSES] Still on Radiated Immunity I believe my chamber is 7m long, 4m wide and 4m high (externally dimensions). It is a partial lined TDK chamber. Sent from Wendy.Nya iPhone On Sep 27, 2011, at 10:33 PM, "Julian Jones" <[email protected]> wrote: I haven't had any luck using a chamber less than 7x5x4 m Julian Jones 07787 523607 On 27 Sep 2011, at 15:05, "Charlie Blackham" < <mailto:[email protected]> [email protected]> wrote: Wendy Have you considered a smaller one? - you can use smaller UFA if EUT size permits. Regards Charlie -----Original Message----- From: WNya [ <mailto:[email protected]> <mailto:[email protected]> mailto:[email protected]] Sent: 27 September 2011 15:10 To: Charlie Blackham Cc: < <mailto:[email protected]> [email protected]> Subject: Re: [PSES] Still on Radiated Immunity The UFA is as per the standard, 1.5x1.5m, 0.8m above GRP Sent from Wendy.Nya iPhone On Sep 27, 2011, at 9:44 PM, "Charlie Blackham" < <mailto:[email protected]> [email protected]> wrote: > Wendy > > What size UFA (uniform field area) are you trying to create? > What size are your EUT (i.e. what sixe UFA do you need?) > > Regards > Charlie > > -----Original Message----- > From: WNya [ <mailto:[email protected]> <mailto:[email protected]> mailto:[email protected]] > Sent: 27 September 2011 14:28 > To: <mailto:[email protected]> <mailto:[email protected]> [email protected] > Subject: [PSES] Still on Radiated Immunity > > Dear EMC Experts, > > I have a 4x3m chamber. I encounter much difficulty to calibrate the chamber > every year. I am using a Schwarzbeck 9128DS and a AR systems. > > Does anyone know any 'tricks' to 'tweak' the chamber to perfection? > > PS: PAMP is 250W, up to 1GHz. > > Sent from Wendy.Nya iPhone > > - > ---------------------------------------------------------------- > 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 > < <mailto:[email protected]> [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > <http://product-compliance.oc.ieee.org/> <http://product-compliance.oc.ieee.org/> http://product-compliance.oc.ieee.org/ > Graphics (in well-used formats), large files, etc. can be posted to that > URL. > > Website: <http://www.ieee-pses.org/> <http://www.ieee-pses.org/> http://www.ieee-pses.org/ > Instructions: <http://listserv.ieee.org/request/user-guide.html> <http://listserv.ieee.org/request/user-guide.html> http://listserv.ieee.org/request/user-guide.html > List rules: <http://www.ieee-pses.org/listrules.html> <http://www.ieee-pses.org/listrules.html> http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas < <mailto:[email protected]> [email protected]> > Mike Cantwell < <mailto:[email protected]> [email protected]> > > For policy questions, send mail to: > Jim Bacher: < <mailto:[email protected]> [email protected]> > David Heald: < <mailto:[email protected]> [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 < <mailto:[email protected]> [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > <http://product-compliance.oc.ieee.org/> <http://product-compliance.oc.ieee.org/> http://product-compliance.oc.ieee.org/ > Graphics (in well-used formats), large files, etc. can be posted to that URL. > > Website: <http://www.ieee-pses.org/> <http://www.ieee-pses.org/> http://www.ieee-pses.org/ > Instructions: <http://listserv.ieee.org/request/user-guide.html> <http://listserv.ieee.org/request/user-guide.html> http://listserv.ieee.org/request/user-guide.html > List rules: <http://www.ieee-pses.org/listrules.html> <http://www.ieee-pses.org/listrules.html> http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas < <mailto:[email protected]> [email protected]> > Mike Cantwell < <mailto:[email protected]> [email protected]> > > For policy questions, send mail to: > Jim Bacher: < <mailto:[email protected]> [email protected]> > David Heald: < <mailto:[email protected]> [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 < <mailto:[email protected]> [email protected]> All emc-pstc postings are archived and searchable on the web at: <http://product-compliance.oc.ieee.org/> <http://product-compliance.oc.ieee.org/> http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: <http://www.ieee-pses.org/> <http://www.ieee-pses.org/> http://www.ieee-pses.org/ Instructions: <http://listserv.ieee.org/request/user-guide.html> <http://listserv.ieee.org/request/user-guide.html> http://listserv.ieee.org/request/user-guide.html List rules: <http://www.ieee-pses.org/listrules.html> <http://www.ieee-pses.org/listrules.html> http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas < <mailto:[email protected]> [email protected]> Mike Cantwell < <mailto:[email protected]> [email protected]> For policy questions, send mail to: Jim Bacher: < <mailto:[email protected]> [email protected]> David Heald: < <mailto:[email protected]> [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://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. 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://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]>
