Right, but these large inverters also have high speed DSP and other processors clocked very fast. Someone on team concluded a 4GHz maximum measurement frequency based on highest internal clock on one of the sub-assemblies. I think the big power bridge switches at 3kHz.
Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric *Please consider the environment before printing this e-mail -----Original Message----- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Wednesday, July 20, 2016 6:54 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] outdoor EMC testing - questions Below it was recommended that they run a sweep to 18 GHz; I was reacting by saying I wasn't aware that CISPR went higher than 6.5 GHz, and that limit was clock frequency dependent, and it appears I was correct. My comment about the inverter power level was not meant as an issue of specsmanshp, but that the higher the power of the device, the lower the switching frequencies employed, hence the spectrum associated with switching would be lower for high power devices because they tend to use lower frequencies to up the efficiency. Ken Javor Phone: (256) 650-5261 > From: "Ghery S. Pettit" <n6...@comcast.net> > Reply-To: "Ghery S. Pettit" <n6...@comcast.net> > Date: Tue, 19 Jul 2016 21:00:50 -0700 > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: Re: [PSES] outdoor EMC testing - questions > > Which CISPR standard? CISPR 22 (ITE) and CISPR 32 (ITE, Broadcast > Receivers and Multimedia Equipment) top out at 6 GHz. The upper > frequency (beyond 1 > GHz) depends on the maximum frequency used in the product, not the > power level. > > Ghery Pettit > > -----Original Message----- > From: Ken Javor [mailto:ken.ja...@emccompliance.com] > Sent: Tuesday, July 19, 2016 8:09 PM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] outdoor EMC testing - questions > > Wow! I thought CISPR topped out at 6.5 GHz max, and I thought that was > based on clock frequency. I would think a super-high power inverter > would max out at 1 GHz, with the actual spectrum much lower. Unless of > course there is a housekeeping power supply and clocked digital > control system using a fast clock. > > Ken Javor > Phone: (256) 650-5261 > > >> From: "Sundstrom, Mike" <mike.sundst...@garmin.com> >> Reply-To: "Sundstrom, Mike" <mike.sundst...@garmin.com> >> Date: Tue, 19 Jul 2016 18:11:30 +0000 >> To: <EMC-PSTC@LISTSERV.IEEE.ORG> >> Conversation: [PSES] outdoor EMC testing - questions >> Subject: Re: [PSES] outdoor EMC testing - questions >> >> Ralph, >> Back in a previous lifetime (at a test lab) I had a similar EUT to >> test. You need to setup your antenna every 20 degrees or 30 degrees >> or >> 45 degrees around the outside of the EUT at a 3 meter or 10 meters >> measurement distance. You need to tailor the setup to the space you >> have. You need to stay between any external metal and the EUT mass. >> You need to discuss this with whomever is signing off on these > measurements. They may want more or less test data. >> >> You also need to raise and lower the antenna from 1 to 4 m at each >> azimuth and each polarity of the scan antenna. You should also scan >> from 30MHz to 1GHz minimum, this would also need to be discussed with >> the sign off group. The best scan you could do is 30MHz to 18GHz with >> the Bi-con (30-300MHz) and a log periodic (300 - 1000MHz) and a >> double ridge horn antenna (1 - 18GHz) . That would give you a good >> understanding of just what you might see radiating in the real world > installation. >> >> I wouldn't worry about the ground plane because it wouldn't be done >> that way if you did it in situ (on site after installation). >> >> Are you not going to do any in situ testing on some of the sites >> after installation? >> >> Thanks, >> >> Michael Sundstrom >> Garmin Compliance Engineer >> 2-2606 >> (913) 440-1540 >> KB5UKT >> >> "We call it theory when we know much about something but nothing works, >> and practice when everything works but nobody knows why." -- Albert >> Einstein >> >> -----Original Message----- >> From: Ralph McDiarmid [mailto:ralph.mcdiar...@schneider-electric.com] >> Sent: Tuesday, July 19, 2016 12:01 PM >> To: EMC-PSTC@LISTSERV.IEEE.ORG >> Subject: Re: [PSES] outdoor EMC testing - questions >> >> Dear group, >> >> We are planning to do radiated emissions on a large EUT (a large >> power >> converter) and use a portion of our outdoor, asphalt parking lot as >> an open area test site. >> We plan to walk an antenna around the EUT, since the EUT and its >> cabling > are >> too large to rotate on a platform. It will be installed in a way very >> similar to actual use in the field, so I think this is quite close to >> in-situ testing. >> >> 1. has anyone tried this? >> 2. apart from a site attenuation test, and perhaps a ground plane >> metal mesh, what else would be needed? >> >> We have facility filters for AC and for DC and voltage probe, current >> probe, one "BiConilog" antenna and a nice new SA. We are working >> with a US EMC company, and they are a Notified Body under the MRA. >> >> Thanks, >> >> Ralph McDiarmid >> Product Compliance >> Engineering >> Solar Business >> Schneider Electric >> >> >> >> >> ________________________________ >> This message was scanned by Exchange Online Protection Services. >> ________________________________ >> >> - >> ---------------------------------------------------------------- >> 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> >> >> ________________________________ >> >> CONFIDENTIALITY NOTICE: This email and any attachments are for the >> sole use of the intended recipient(s) and contain information that >> may be Garmin confidential and/or Garmin legally privileged. 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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. 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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 email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ ________________________________ This message was scanned by Exchange Online Protection Services. ________________________________ - ---------------------------------------------------------------- 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>
