Just finished some testing at an accredited lab. For an accredited report, they run QPs on all measurements whose peak are w/in 6 dB of the limit. I don't know if that's their rule, or by the regulations. FYI Colorado Brian ---------- Forwarded Message ---------- From: Bill Owsley <000000f5a03f18eb-dmarc-requ...@listserv.ieee.org> To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Radiated Emissions - How many points to QP? Date: Mon, 8 Apr 2024 06:19:10 +0000
It reads like there are two limits, peak and QP. Go over either one and by how many and by how much over, does not matter. it is a fail and fix it. Otherwise, the lab should be recording the 6 points of each P and QP for 12 points, well, let the slide if all points are below the QP limit and graph shows that. Now to get lab to show a continuous graph for radiated emissions might be a problem. Easier to get a new lab ! Some cheap labs will fake a continuous plot by connecting the highest dots. Run from them ! Long details on the experience that I got. On Friday, April 5, 2024 at 03:33:01 PM EDT, Stultz, Mark <00000f79f2e10e47-dmarc-requ...@listserv.ieee.org> wrote: Hello PSES brain trust, When doing radiated emissions measurements, how many frequencies should be quasi-peaked? CISPR 16-2-3 clause 6.4.9 states: “Of those disturbances above (L-20dB), where L is the limit level in logarithmic units, the disturbance levels and the frequencies of at least the six highest disturbances shall be recorded.” We have always done QP measurements on all peak measurements above the limit, even if that is more than six points. I have a lab arguing that they only need to measure the top six, regardless of how many peak measurements are above the limit. Any thoughts are appreciated. Thanks, Mark 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-PSTC@LISTSERV.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 at: 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 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-PSTC@LISTSERV.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 at: 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 - ---------------------------------------------------------------- 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-PSTC@LISTSERV.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
