I don't understand why calibrating the field at higher intensities would require a different technique than already outlined in 61000-4-3. That quiet zone determination should work regardless of level. When you get to the point where you are power limited, then you may see problems. If you are trying to get to 200 V/m and you don't have enough rf power, you may need to move your antenna in closer to the test sample. As soon as you do that, you degrade the ability to illuminate as large a quiet zone. MIL-STD-461E allows the use of a single field probe within 30 cm of a ground plane. This is real-time leveling in the presence of the EUT. There is no way this is as accurate as the 61000-4-3 quiet zone with no ground plane distorting the field. This is not a condemnation, it is just a different test configuration. Note that as long as you stay above 80 MHz, you can get to 200 V/m, but if you are trying to get to 26 MHz, you can't get to 200 V/m with a biconical or similar type antenna.
From: jeff collins <jeffcollin...@yahoo.com> List-Post: emc-pstc@listserv.ieee.org Date: Tue, 11 Apr 2006 10:57:34 -0700 (PDT) To: emc-p...@ieee.org Subject: RE: Radiated Immunity Testing Beyond 61000-4-3 Group, I need to perform Radiated Immunity testing beyond the 61000- 4-3 limits. Section 5 of 61000-4-3 , Table 1 refers to this as the "Open Test Level" where the field strength may be any value. The question I have is: How do you calibrate and measure the field strength at levels above the 61000-4-3 requirements? I've seen emails in the past from folks making measurements at 200V/m and higher. I'm hoping someone will chime in and enlighten me on how the calibration and measurement was done at those levels. Are there any Mil -Spec's that cover how to achieve field calibration at these higher levels? Thanks, Jeff Collins Compliance & Reliability jcoll...@six9sreliable.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
