Hi Ken, Nice article. I would love to have seen you add in an OATS to your measurements.
What you publish correlates with what we have found on our 10m OATS, 5m chamber and 3m compact chamber. Namely that below 100 MHz, 3m test distances emissions tend to read high. I hadn’t planned to publish our results, but in light of this series of posts, maybe I should. Take care, Derek. > On Oct 9, 2024, at 12:40 PM, Ken Wyatt <[email protected]> wrote: > > Hi All, > > I had a chance to make some comb generator measurements at a lab with two 10m > chambers. I used the AET USDS spherical comb generator designed by Dr. Bruce > Archambeault (no longer available, unfortunately). There was an age > difference between the two chambers, with the older ferrite tile lined and > the newer, ferrite tiles with absorber cones. One of the charts shows the > difference between 3m and 10m test distance. > > Use of comb generator to compare 3m and 10m measurements: > https://www.edn.com/review-the-aet-usds-spherical-harmonic-comb-generator/ > > One outcome was the linked article, but what was missing in that was the > comparison between the two chambers (horizon polarization, only). See second > link to the table. In every case, the comb generator was positioned on a > tripod 1m above the reflecting floor. There was as much as 15 dB difference > between the two. I’ve not published this last chart, but did leave it with > the test lab management. > > Chamber 1 and 2 comparison: > https://www.dropbox.com/scl/fi/yln8697jufl7xl8kvybol/Delta-Chamber-1-Versus-2.png?rlkey=n9s1wvzgfe8wybwxfig8jangp&dl=0 > > Cheers, Ken > _______________________ > > I'm here to help you succeed! Feel free to call or email with any questions > related to EMC or EMI troubleshooting - at no obligation. I'm always happy to > help! > > Kenneth Wyatt > Wyatt Technical Services LLC > 8201 Lighthouse Lane Ct > Windsor, CO 80528 > > Contact Me! New Books! > > > <EMC TS Vol1 Cover.jpg> <EMC TS Vol2 Cover.jpg> <EMC TS Vol3 Cover SM.jpg> > > Web Site | Blog > The EMC Blog (EDN) > Subscribe to Newsletter > Connect with me on LinkedIn > >> On Oct 9, 2024, at 1:07 AM, doug emcesd.com <http://emcesd.com/> >> <[email protected] <mailto:[email protected]>> wrote: >> >> I agree and was involved with the early development of emission standards >> with with Don Heirman. But still, other areas of engineering are much more >> accurate/have very low uncertainty than EMC. >> >> It is sad that most everyone I knew from the early days of EMC are gone now. >> Many of them, Heirman and Ott, for example, were friends. I hope to continue >> to help engineers in the wider field of engineering and physics, including >> EMC for another 25-30 years. >> >> By the way, another of my interests is medicine, which I have studied on my >> own for 50 years now and have successfully slowed the aging process and >> successfully treated my spouse’s ovarian cancer (after the surgery to remove >> two very large tumors) without an oncologist. Just another part of science >> as EMC is. >> >> Doug Smith >> Sent from my iPhone >> IPhone: 408-858-4528 >> Office: 702-570-6108 >> Email: [email protected] <mailto:[email protected]> >> Website: http://dsmith.org <http://dsmith.org/> >> From: Brent DeWitt <[email protected] <mailto:[email protected]>> >> Sent: Tuesday, October 8, 2024 5:57:46 PM >> To: doug emcesd.com <http://emcesd.com/> <[email protected] >> <mailto:[email protected]>>; [email protected] >> <mailto:[email protected]> <[email protected] >> <mailto:[email protected]>> >> Subject: Re: [PSES] technical musings >> >> Doug, >> >> Respectfully, I would not agree. I'm not sure what "other areas of >> engineering" you're referring to. 🙂 >> >> First, if we are discussing commercial emissions standards, they are ancient >> and date back to the days when Apple 2 PCs were interfering with "rabbit >> ear" TV reception (1979) when Part 47 was drafted. The levels were largely >> drawn from the VDE 0871 standard. I doubt anyone with knowledge of the >> methodology has suggested that the overall process is deterministic. >> >> The question of measurement uncertainty was championed by Don Heirman for >> years and continues to be debated. >> >> Regulations and standards have done a very good, if somewhat painful, job of >> quantifying the uncertainty of the measurement process. The most competent >> and well executed test laboratory cannot fully control a customer's EUT or >> even have total control over the configuration. That is an advantage for a >> manufacturer having their own in-house test facility. >> >> All that said, I feel that the "state of EMC testing" has evolved to produce >> very respectable results, given the real world constraints. >> >> Best to all and 73 Jim! >> >> Brent DeWitt, AB1LF >> IEEE EMC Society Senior Life Member >> Milford, MA >> >> >> On 10/8/2024 7:07 PM, doug emcesd.com <http://emcesd.com/> wrote: >>> Seems like the state of EMC testing is not good compared to other areas of >>> engineering! >>> >>> Doug Smith >>> Sent from my iPhone >>> IPhone: 408-858-4528 >>> Office: 702-570-6108 >>> Email: [email protected] <mailto:[email protected]> >>> Website: http://dsmith.org >>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__dsmith.org&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=jCRzTaNQorPZq38xZ6lIGQ&m=PO8Xq-rf40J5GT-pnX65HnCPIlbJsadMVgQOBFB_G2_quXYk7CiKX5YgIgmvdwb9&s=kpNzJt0YWej3BUidKRv3bPPdHy9hltqIOUPrcw765Vg&e=> >>> From: Jim Bacher, WB8VSU <[email protected]> <mailto:[email protected]> >>> Sent: Tuesday, October 8, 2024 8:50:49 AM >>> To: [email protected] <mailto:[email protected]> >>> <[email protected]> <mailto:[email protected]> >>> Subject: Re: [PSES] technical musings >>> >>> Back in the 1980s I had a variation in system measurements between labs. >>> Management decided the lab I used wasn't any good. In the process of trying >>> to convince management variations were normal, I came to the conclusion >>> that measuring systems at different labs would likely have a +5 to -7 dB >>> variations. >>> >>> None of our test equipment is perfectly flat. No one calibrates every Hz to >>> account for those imperfections. The frequency being measured is typically >>> not on any of the calibrated frequencies. >>> >>> For testing a system, equipment and cable variations can impact their >>> emmisions significantly. I have seen over 20 dB of variation due to the >>> variations. How much effort was made to peak signals? >>> >>> Then is the test equipment measurement operator an avid Ham DXer (chases >>> weak signals to talk to far away stations)? Reason is a Ham will likely do >>> a more accurate peaking of rotation and height of the search antennas. >>> >>> I have had one government lab fail to compensate for a preamp when >>> reporting levels and said the product failed. I had the agent pull it back >>> for a few days, then take it back and it passed with no changes. So some >>> errors can be to using the wrong calibration factors when calculating the >>> levels. >>> >>> >>> Jim Bacher, WB8VSU >>> [email protected] <mailto:[email protected]> or [email protected] >>> <mailto:[email protected]> >>> JBRC Consulting LLC >>> Product EMC & Regulatory Consultant >>> https://www.trc.guru/ >>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__trc.guru_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=c6nhOLO-gj8oBRPLqcRVVpB0b-ty2YpxMuPsVxNFhzVvK9nhFk_fDyBnXHNW3JKZ&s=g1_EVtpoDllNYD7LkeKyb79aTJlbmsmq8mEaNwLSZ4I&e=> >>> email:[email protected] <mailto:email:[email protected]> >>> IEEE Life Senior Member >>> >>> On October 8, 2024 11:14:28 AM David Schaefer >>> <[email protected]> >>> <mailto:[email protected]> wrote: >>> >>>> Harry Hodes gave a presentation at the C63 meetings last week on >>>> proficiency testing. He runs the ACIL PT program, and the data he shared >>>> showed a ton of variance. Many labs were in I think +/-3-4 dB range, but >>>> there were outliers – the worst cases being one lab reading 30-40 dB high, >>>> another 30-40 dB low. If I recall correctly for one PT program 95 labs >>>> participated and around 10 were outside the expected tolerance. >>>> >>>> Doing a check of the measurement system prior to testing is critical. A >>>> comb gen scan takes only a few minutes but should catch these egregious >>>> errors. >>>> >>>> >>>> >>>> <image404476.jpg> >>>> David Schaefer >>>> Technical Manager >>>> Element Materials Technology >>>> 9349 W Broadway Ave >>>> Brooklyn Park >>>> , >>>> MN >>>> 55445 >>>> , >>>> United States >>>> O +1 612 638 5136 <tel:+1%20612%20638%205136> >>>> ext. 10461 >>>> [email protected] <mailto:[email protected]> >>>> www.element.com >>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__us.content.exclaimer.net_-3Furl-3Dhttps-253A-252F-252Fwww.element.com-252F-26tenantid-3DixvYNdAGEeqbBQANOhMLNA-26templateid-3Daabe0990b90beb1196f5000d3a130b34-26excomponentid-3Dbvr0O264AGzU1lp7QuELkdlEOzfI2OKH9ixGcRY-2DRKU-26excomponenttype-3DLink-26signature-3DcZ5egsqVcuTJwdSIK2EbV6p7Tgro9jT7-5FTkg-2DFb3YiB23cBOgCoUmOEqeUjNn3Wb1utJh-5FtCAps2nMvNa74FEJYf-2DWrOczTU6zFlHw54Kkx7YpXyoM-2DCTV1wYsG6Kp67xdorBRMa5LiebYSyV1KLNeSLvlAMyCdpGXdRt4PdyKih9tRDbM50s0p-5F22b-5Fgp9LGtkISjiEDnV76ZvXKmVbUxVVd0tqHec9MBwk-5FT418oc5ZZWOclsIYRqkwfQqf0Wqj5isA4xlnhmt49FZz-2D5XoxKuiGArsymw-5FY4qtO9TEOwjITToveVj6b1-5FZkHWiMlIWuUr1cjhpNrAxmzAv6LY8g-26v-3D1-26imprintMessageId-3Daf671dc5-2D2f27-2D4e6c-2D8522-2Db4326c125f66&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=c6nhOLO-gj8oBRPLqcRVVpB0b-ty2YpxMuPsVxNFhzVvK9nhFk_fDyBnXHNW3JKZ&s=xjPbbnT7r9JzjJRQocs1tboth_-n-izdjcIZPOOZ7Vc&e=> >>>> <image627505.png> >>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__us.content.exclaimer.net_-3Furl-3Dhttps-253A-252F-252Ftwitter.com-252FElementTesting-252F-26tenantid-3DixvYNdAGEeqbBQANOhMLNA-26templateid-3Daabe0990b90beb1196f5000d3a130b34-26excomponenttype-3DSocialMediaIcon-26signature-3DACovrZvJeYWsDyyKT0zvYAsZsidrWJylGQABf2bJhKNtCg10KfO2BYNiEUfocR4zw1YzoxFMvQi8ibysZnq3cNZQ2enJrElHRFhuRkcKd45P1AH6s8ee-2D4IsaM0qk-5FDybvwO5i12-2D-5FP-5FXaBFh2-5F9xOmCWZdsBiX-2Dt-5F6d3mt1nvVR8gKtz-2D8s3FLwTT0uFlbk4MqGLEBOJRREfG-5FZRdBPMRb4PKgkhNDQ4QWsEBPZxwChBoMJQyoQTTD6h1cgGbuyr7tQO6Qs9Y36o1lT7tgQY1FpJ7t8IzelvDE7pnzJ7HW6Izwq6FoBil54k2vQh9lhHva6dgfz-5Fzh9TdhlHUeFOw-26v-3D1-26imprintMessageId-3Daf671dc5-2D2f27-2D4e6c-2D8522-2Db4326c125f66&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=c6nhOLO-gj8oBRPLqcRVVpB0b-ty2YpxMuPsVxNFhzVvK9nhFk_fDyBnXHNW3JKZ&s=khJJN9LxDa8ozA8QZyNy83HYUdighuWcx7eASEXkZtc&e=> >>>> >>>> <image882535.png> >>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__us.content.exclaimer.net_-3Furl-3Dhttps-253A-252F-252Fwww.instagram.com-252Felementtesting-252F-26tenantid-3DixvYNdAGEeqbBQANOhMLNA-26templateid-3Daabe0990b90beb1196f5000d3a130b34-26excomponenttype-3DSocialMediaIcon-26signature-3DJFA-5FC5bAd9pBZiZaSwZX-5F-5FvhNs-2DS3M7YTVfi09pIXK1gAXP45i-5F59EBt5lobzjQ9vJpXmcA6Culn3ScJ4KoeJDH-5FKArSoBjG1D9DgSV9uBjiqtoY-5FR0pRy2C2xdzJJzE23qcW1VbyOPH5oED5R5Lw4293PVxGh8b8iVg5ucDVDD7Wv1qQ397usbAsSnLgtNiNRdYaUcd117IEi8S1tvs-5FyBmd5EfMYwWk3mRXndcszbDP4fNvqHXqAjwMjzPWfEiCBLm5q16NTaxc6zYjxG7fKDkoKqsDx9IceOzpt4VP1AaVUISQ4pP01qjUK926Mb3n4aIBXlPNdNFtQdU02BIgw-26v-3D1-26imprintMessageId-3Daf671dc5-2D2f27-2D4e6c-2D8522-2Db4326c125f66&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=c6nhOLO-gj8oBRPLqcRVVpB0b-ty2YpxMuPsVxNFhzVvK9nhFk_fDyBnXHNW3JKZ&s=KnRW0FkDDEMxhFSlbIkVAqRR6WhF4G16Yn963aHF_Js&e=> >>>> >>>> <image798446.png> >>>> 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>>>> From: doug emcesd.com <http://emcesd.com/> <[email protected]> >>>> <mailto:[email protected]> >>>> Sent: Monday, October 7, 2024 6:08 PM >>>> To: [email protected] <mailto:[email protected]> >>>> Subject: [PSES] technical musings >>>> >>>> CAUTION:This email originated from outside of Element Materials >>>> Technology. DO NOT click links or open attachments unless you recognize >>>> the sender and know the content is safe. Please contact the TOC if you are >>>> in any doubt about this email. >>>> >>>> I have seen differences of 9 dB on the same measurement on an EUT and comb >>>> generator by different accredited labs! >>>> >>>> Doug >>>> >>>> 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 >>> [email protected] <mailto:[email protected]>All emc-pstc >>> postings are archived and searchable on the web at: >>> https://www.mail-archive.com/[email protected]/ >>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.mail-2Darchive.com_emc-2Dpstc-40listserv.ieee.org_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=jCRzTaNQorPZq38xZ6lIGQ&m=PO8Xq-rf40J5GT-pnX65HnCPIlbJsadMVgQOBFB_G2_quXYk7CiKX5YgIgmvdwb9&s=GLg8f5KtSbk5kQz40KaIswaF00g9eMpCV_zQ4A7MB2k&e=> >>> Website: https://ewh.ieee.org/soc/pses/ >>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__ewh.ieee.org_soc_pses_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=jCRzTaNQorPZq38xZ6lIGQ&m=PO8Xq-rf40J5GT-pnX65HnCPIlbJsadMVgQOBFB_G2_quXYk7CiKX5YgIgmvdwb9&s=hAqvgUgPVhcBFFxwk3jlgv-cp1Umxag0r6NZsG5xTFs&e=> >>> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to >>> unsubscribe) >>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__ewh.ieee.org_soc_pses_list.html&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=jCRzTaNQorPZq38xZ6lIGQ&m=PO8Xq-rf40J5GT-pnX65HnCPIlbJsadMVgQOBFB_G2_quXYk7CiKX5YgIgmvdwb9&s=poWNP35YKA508s3p-dOD3VD4yvHIXW1JYdqDHxakBJc&e=> >>> List rules: https://ewh.ieee.org/soc/pses/listrules.html >>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__ewh.ieee.org_soc_pses_listrules.html&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=jCRzTaNQorPZq38xZ6lIGQ&m=PO8Xq-rf40J5GT-pnX65HnCPIlbJsadMVgQOBFB_G2_quXYk7CiKX5YgIgmvdwb9&s=VEINZcSmkj0Pkb3iw6ZRDKapRMZUI0Gs2svWX_t1s-A&e=> >>> For help, send mail to the list administrators: >>> Mike Sherman at: [email protected] <mailto:[email protected]> >>> Rick Linford at: [email protected] <mailto:[email protected]> >>> For policy questions, send mail to: >>> Jim Bacher at: [email protected] <mailto:[email protected]> >>> To unsubscribe from the EMC-PSTC list, click the following link: >>> https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 >>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__listserv.ieee.org_cgi-2Dbin_wa-3FSUBED1-3DEMC-2DPSTC-26A-3D1&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=jCRzTaNQorPZq38xZ6lIGQ&m=PO8Xq-rf40J5GT-pnX65HnCPIlbJsadMVgQOBFB_G2_quXYk7CiKX5YgIgmvdwb9&s=jk_N56Si64OF8UiAdZdxiPtXRxZqxTPg6ixIDpVPlW4&e=> >> 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] <mailto:[email protected]>All emc-pstc >> postings are archived and searchable on the web at: >> https://www.mail-archive.com/[email protected]/ >> >> 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: [email protected] <mailto:[email protected]> >> Rick Linford at: [email protected] <mailto:[email protected]> >> For policy questions, send mail to: >> Jim Bacher at: [email protected] <mailto:[email protected]> >> 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 > [email protected] > > All emc-pstc postings are archived and searchable on the web at: > https://www.mail-archive.com/[email protected]/ > > 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: [email protected] <mailto:[email protected]> > Rick Linford at: [email protected] <mailto:[email protected]> > For policy questions, send mail to: > Jim Bacher at: [email protected] <mailto:[email protected]> > 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 [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ 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: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
