Hi Muriel, After I read your reply. I got a little scared. I actually forgot how I did it. (It has been a few years.) I too have a commercial LISN that has a switched output. It won't work with the separator.
I had to actually walk over to the lab and pick through the cobwebs to figure out what was missing. The BIG detail that I forgot to tell you was that I built a prototype of the LISN that is in Clayton Paul's book as well. This LISN has the phase and neutral emissions brought out to separate outputs, not switched. So, in order to take the measurements, I had to use this LISN and the separator. Both were built for less than $100 in parts. And as you can see, both haven't been used for quite a while. The LISN was built before I got into safety design, so I leave it on the shelf and use the nice "safe" one that we purchased. When I get the time, I'll share some of the components... off line. For now, it would be helpful to refer to the LISN schematic in Clayton R. Paul's book. That will answer the question of how a single LISN could work. Sorry for the confusion. Chris > -----Original Message----- > From: Muriel Bittencourt de Liz [SMTP:mur...@eel.ufsc.br] > Sent: Tuesday, February 05, 2002 9:02 AM > To: Chris Maxwell > Subject: RE: Conducted noise emission diagnosis device > > > Hi Chris, > > I have a LISN (Rohde&Schwarz) that have changing from Neutral/Phase by > a switch. Most separators from common-mode and differential mode use 2 > LISN's to obtain their noise currents separated. Is there a way of > building this separator with my type of LISN? > > And, if it's not asking too much, do you have or know any schematic > with construtive details of a separator? > > Thanks for the help! Regards, > > Muriel > > > ---------- Original Message ---------------------------------- > From: "Chris Maxwell" <chris.maxw...@nettest.com> > Date: Tue, 5 Feb 2002 07:43:43 -0500 > > >Hi Muriel, > > > >I have the same book by Clayton Paul as it was used as a textbook for > a > >graduate course in EMC at SUNY Binghamton. > > > >After SUNY Binghamton, I started was working as a design engineer. > That > >was the year before the EMC directive became mandatory. My boss saw > Mr > >Paul's book in my office... and well...next thing you know, I'm > suddenly > >the EMC guy with "Captain Zap" for a nickname... Enough about my sad > >fall from grace :-) > > > >One of the first things I did was to build one of these devices. I > >never have seen one for sale. Honestly, until your email, I thought > I > >was the only person who actually tried to make one. (other than Mr. > Paul > >himself) > > > >I don't use it too much any more. We have gotten fairly good at > >guessing whether the emission is differential mode or common mode. > If > >we guess correctly, it's quicker to just put in the capacitor or > choke > >and give it a try. > > > >It's been a while since I built it, so my memory is fuzzy. But I may > be > >able to help if you have a question or two. > > > >Chris Maxwell | Design Engineer - Optical Division > >email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 > 797 > >8024 > > > >NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA > >web www.nettest.com | tel +1 315 797 4449 | > > > > > > > > > > > > > > > > > > > > > >> -----Original Message----- > >> From: Muriel Bittencourt de Liz [SMTP:mur...@eel.ufsc.br] > >> Sent: Monday, February 04, 2002 10:38 PM > >> To: EMC-PSTC > >> Subject: Conducted noise emission diagnosis device > >> > >> > >> Hello Group, > >> > >> > >> I am looking for a device that will differentiate the dominant > >> component > >> (either > >> common-mode or differential-mode current) in the total conducted > noise > >> emission > >> current of a product measuring through its' power cord using a > LISN. > >> > >> > >> This device can be called "common/differential mode current > >> separator". In > >> conducted > >> noise emission measurement, both common-mode and differential mode > >> noise > >> current are measured by LISN and the LISN can't tell which mode is > the > >> dominant > >> current. > >> > >> > >> I came across a paper by Clayton Paul and Keith Hardin which > explain > >> the > >> usefulness of a separator like this that would identified the > dominant > >> current > >> from the total current. Hence, the correct capacitor value(either > >> X-caps or > >> Y-caps) can be changed accordingly so to reduce the overall > conducted > >> noise. > >> The book by Clayton Paul "Introduction to Eletromagnetic > >> Compatibility" has > >> also mention about this device. > >> > >> > >> I have contacted a few persons trying to look for the person who > have > >> actually > >> built this separator himself and I am also looking for any vendor > who > >> have > >> this > >> product for sale. So far, my effort has yield no results. > >> > >> > >> Can anybody point me to the right person so that i can try to built > >> this > >> separator myself. Any other suggestion and comments are greatly > >> appreciated. > >> > >> > >> Best Regards, > >> > >> ************************************************************** > >> > >> Muriel Bittencourt de Liz > >> > >> Ph.D. Student > >> > >> Federal University at Santa Catarina > >> > >> Florianópolis, SC > >> > >> Brazil > >> > >> > >> > >> > >> ------------------------------------------- > >> This message is from the IEEE EMC Society Product Safety > >> Technical Committee emc-pstc discussion list. > >> > >> Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > >> > >> To cancel your subscription, send mail to: > >> majord...@ieee.org > >> with the single line: > >> unsubscribe emc-pstc > >> > >> For help, send mail to the list administrators: > >> Michael Garretson: pstc_ad...@garretson.org > >> Dave Heald davehe...@mediaone.net > >> > >> For policy questions, send mail to: > >> Richard Nute: ri...@ieee.org > >> Jim Bacher: j.bac...@ieee.org > >> > >> All emc-pstc postings are archived and searchable on the web at: > >> No longer online until our new server is brought online and the > >> old messages are imported into the new server. > > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
