There are many antennas suitable for making measurements at one meter. There are log-periodics that start at 200 MHz, and even a 137 cm tip-to-tip biconical works, although in vertical polarization it will be slightly unbalanced due to one element being loaded by the floor.
Ken Javor Phone: (256) 650-5261 > From: "T.Sato" <vef00...@nifty.ne.jp> > Reply-To: "T.Sato" <vef00...@nifty.ne.jp> > Date: Sat, 9 May 2015 20:07:10 +0900 > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: Re: [PSES] Radiated Immunity at 1meter distance > > On Sat, 9 May 2015 12:27:51 +0200, > "ce-test, qualified testing bv - Gert Gremmen" <g.grem...@cetest.nl> wrote: > >> Partial Illumination is the term for the solution to your question. >> EN 61000-4-3 mentions it explicitly. >> Shift the antenna, and repeat the test until all areas have been >> illuminated. >> It requires some knowledge about the antenna angles and some basic >> goniometrics... > > But, although I think that the requirement is rather useless when > we are trying to simulate radio transmitters in close proximity, > I believe we need to have UFA not smaller than 1,5 m x 1,5 m for > partial illumination as specified in IEC/EN 61000-4-3. > > Regards, > Tom > >> -----Original Message----- >> From: Kunde, Brian [mailto:brian_ku...@lecotc.com] >> Sent: Friday 8 May 2015 21:56 >> To: EMC-PSTC@LISTSERV.IEEE.ORG >> Subject: [PSES] Radiated Immunity at 1meter distance >> >> With the release of the 4th edition of IEC60601, we are being asked if >> we can hit 28V/m for Radiated Immunity on the list of bands/frequency >> called out in Table 9. In our current test setup in a large chamber >> setup in a 3 meter FAR, we can barely hit 18 V/m CW at some frequencies. >> Not sure about these Wireless frequencies until we try. There is a note >> at the bottom of table 9 which states that we can test at a 1 meter >> distance per IEC 61000-4-3, which should increase power but wouldn't >> this also quite drastically narrow the size of the UFA? >> >> I'm sure I can calibrate a 0.5m x 0.5m window but the standard implies >> that the Independent Window Method is only allowed for frequencies above >> 1Ghz. I use a large log antenna below 1Ghz and since I've never tried >> I'm not sure if the beam width limits the size of the UFA at a 1 meter >> distance. >> >> Done anyone have experience with this and can give me some pointers >> before I start wasting my time? >> >> I assume at a 1 meter distance, my UFA would be much smaller. How would >> you recommend I perform the calibration test. In one example, the EUT >> will be floor standing yet over 2 meters in length. We have to move the >> EUT to test a section of it as a time as it is. >> >> The Window Method also wants you to position the transmit antenna in the >> center of the Window, but at frequencies below 1Ghz, the radials on my >> log antenna are so long I cannot lower the antenna to 1.05m off the >> floor without the longer radials getting too close to the floor. >> >> Any help or advice would be helpful. >> >> Regards, >> The Other Brian >> >> ________________________________ >> >> LECO Corporation Notice: This communication may contain confidential >> information intended for the named recipient(s) only. If you received >> this by mistake, please destroy it and notify us of the error. Thank >> you. >> >> - >> ---------------------------------------------------------------- >> 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://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 <sdoug...@ieee.org> >> 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://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 <sdoug...@ieee.org> >> 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://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 <sdoug...@ieee.org> > 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://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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
