The EMC standard with which I am familiar (CISPR11, EN55022) are well written and provide examples of best practice setup and how to arrange excess cable length. I suggest going over the standard with the test technician at the EMC lab to better understand the requirement.
If it were my product, I wouldn't lose a minute's sleep over a 1dB pass at a narrow range of frequency in the test spectrum, however, I would want to test at rated power. You may find that peak rises with increasing EUT power. Ralph From: Brian Gregory <brian_greg...@netzero.net> Sent: Tuesday, October 31, 2023 2:29 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] 2 simple questions on EMC Hi, 1. Our unit is passing by a whisker, under 1dB @ 30 Mhz in a 3m chamber against SubpartB requirements. Can we expect margin to improve in a 10m chamber? 2. It's lightly loaded in the chamber (10% of FL), we do expect the peak to squash down a bit with full load; they do when going from zero load to 10%. 3. We were idly wondering about cable loop; the output cable (bundled AWG #6) is 6' runs about 12" in front of the unit towards the antenna and the balance of it is currently coiled up in a loose bundle under the test setup. The standards don't say anything about cable routing, just that it should be on the ground plane. I don't like it running 'in front' of the unit, but the lab tech says that's pretty standard and not driven by the necessities of the test setup. Is that standard for a radiated setup? Colorado Brian _____ 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 All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net <mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org <mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org <mailto:j.bac...@ieee.org> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- 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: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
