Gert et al, A non-ferrous OATS requirement (or preferred)? That's a new one on me too.
But I know this is technically true for the EFT/ESD tests, Cu and Al are listed as possible ground references, but not steel. I guess we are lucky in that *our* new OATS ground plane, new conducted emission lab, ESD, and EFT ground references are all non-ferrous because they are made entirely of sheet aluminum (~ 5mm thick) and joined with thin aluminum flashing for RF continuity. Steel is used to mechanically support the vertical reference plane for the conducted emission lab. :P Best Regards, Eric Lifsey National Instruments Please respond to "Scott Douglas" <s_doug...@ecrm.com> To: ken.ja...@emccompliance.com, emc-p...@ieee.org cc: (bcc: Eric Lifsey/AUS/NIC) Subject: RE: conducted emissions test setup
Ken, The ground plane should be non-ferrous? That is a new one to me. Are all the OATS I have been to using non-ferrous ground planes? Never really noticed that before. I thought they were all galvanized steel. Somebody please enlighten me. Scott s_doug...@ecrm.com ECRM Incorporated Tewksbury, MA USA -----Original Message----- From: ken.ja...@emccompliance.com [mailto:ken.ja...@emccompliance.com] Sent: Wednesday, February 23, 2000 6:22 PM To: mur...@grucad.ufsc.br; emc-p...@ieee.org Subject: Re: conducted emissions test setup Importance: Low The ground plane acts as a sink for common mode CE. Without it, you have an uncontrolled test. The ground plane should be non-ferrous. Cu or bronze or even Al will work, but you can solder to Cu and bronze, but not to Al. The ground plane is common with the green wire. The LISN must definitely be bonded to the ground plane. The analyzer is connected by virtue of the coax connection to the LISN EMI port. That is technically sufficient. The spectrum analyzer should have its power input sufficiently well-filtered to be able to share a power connection with the PC. If not, they can be fed from different circuits. The green wire should be common to both circuits. ---------- >>From: Muriel Bittencourt de Liz <mur...@grucad.ufsc.br> >>To: Lista de EMC da IEEE <emc-p...@ieee.org> >>Subject: conducted emissions test setup >>Date: Wed, Feb 23, 2000, 8:32 AM >> >> >> Hello Group, >> >> Reading CISPR 16 and CISPR 22, I had some doubts about the correct setup >> for doing conducted emissions testing. I'd like to know if someone can >> put a light on this subject. >> >> My questions are: >> >> - The "ground plane" is really needed? If I don't use one, my results >> will be wrong? Or without a ground plane I'll be testing for the "worse >> conditions"?? >> >> - The ground plane can be made of any metal? Or there are specified >> ones? >> >> - The ground plane must be bonded to the GND connector of my mains? (my >> outlet is three pins: P, N and GND) >> >> - If I understood, the ground plane will be my "reference ground", >> right? >> >> - My testing equipment (receiver+LISN) must be bonded to this same >> ground plane? The ground plane is bonded to the ground connector of my >> mains? >> >> - I use a PC to collect the test data. Can it be feeded by the same >> circuit that feeds the EUT+LISN? The ground connector of the PC (the one >> that's in the three pin plug) should be at the same ground than the >> ground plane? >> >> Thanks in advance and Regards! >> >> Muriel >> >> -- >> 8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-)8-) >> Muriel Bittencourt de Liz, M.Sc. - EMC Engineer >> GRUCAD - Group for Conception & Analysis of Electromagnetic Devices >> Santa Catarina Federal University - UFSC >> PO Box: 476 ZIP: 88040-900 - Florianópolis - SC - BRAZIL >> Phone: +55.48.331.9649 - Fax: +55.48.234.3790 >> e-mail: mur...@grucad.ufsc.br >> ICQ#: 9089332 >> >> ---------
