Not a car. The power to our EUT is cycled by a a device. To put it on the other side of the LISN would not mean much as we have no control of that device. And even if we did that, the continuous interruption of the DC current would still send the LISN into oscillation at each current edge.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: [email protected] Website: http://dsmith.org ________________________________ From: Ken Javor <[email protected]> Sent: Thursday, December 9, 2021 7:55:05 PM To: [email protected] <[email protected]> Subject: Re: [PSES] unusual conducted emissions question The purpose of a LISN when testing for vehicular use is to simulate the common impedance between battery and fuse block. There should be no power cycling “behind” the LISN, because in the vehicle there is no switch between battery and fuse block other than the ignition switch itself. Therefore the power cycling device goes between the LISN output and the switched load. Ken Javor Phone: (256) 650-5261 ________________________________ From: Douglas Smith <[email protected]<https://urldefense.proofpoint.com/v2/url?u=http-3A__doug-40emcesd.com&d=DwMFAw&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=kavBu9H9umaS2l7Zwzp81cdwEgTt9UJa3f56hflvA8A&s=OVcQCPr1r2j4G99wMQoHdTA8Uh-Ecshq2eAiFJgY7Xc&e=>> Reply-To: Douglas Smith <[email protected]<https://urldefense.proofpoint.com/v2/url?u=http-3A__doug-40emcesd.com&d=DwMFAw&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=kavBu9H9umaS2l7Zwzp81cdwEgTt9UJa3f56hflvA8A&s=OVcQCPr1r2j4G99wMQoHdTA8Uh-Ecshq2eAiFJgY7Xc&e=>> Date: Fri, 10 Dec 2021 00:16:51 +0000 To: <[email protected]<https://urldefense.proofpoint.com/v2/url?u=http-3A__EMC-2DPSTC-40LISTSERV.IEEE.ORG&d=DwMFAw&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=kavBu9H9umaS2l7Zwzp81cdwEgTt9UJa3f56hflvA8A&s=RMadKU3rlYA8dxMrL249JcSU5tJZbNiPKINvJSO5bwo&e=>> Subject: [PSES] unusual conducted emissions question Hi All, I have come across an unusual conducted emissions issue with a device where the impedance stabilization network for automotive testing itself causes a problem that will not let a class of equipment ever pass because of the network not the equipment itself. In this case, the power is cycled every second and the device that does that is behind the network as that is not being tested. The interrupted power goes through the network (12 Volts) and to the EUT. We got to the point where we replace the EUT with a DC load, 10 Ohm resistor in parallel with a 10 uF cap, to simulate the inrush current. That combination fails at the low end of the frequency spectrum a lot because the network, just a collection of L, C, and R is ringing at each power transition. Any thoughts? Seems like an artifact of the standard. The device cycling power is a lab circuit and not part of the test and so should be behind the network. Doug [cid:3721931705_1385162] - ---------------------------------------------------------------- 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]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
