Hi Brian 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...
Gert Gremmen -----Original Message----- From: Kunde, Brian [mailto:[email protected]] Sent: Friday 8 May 2015 21:56 To: [email protected] 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 <[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]>
