Hi Richard, It is a test & measurement product used in a telecom environment. So we often test DC conducted emissions on the 48VDC input to a hodge-podge combination of EN61326-1(which uses EN 55022 limits), 300386-X and certain customer specific EMC standards. Some of our customers reference obscure standards such as 300 132-2 paragraphs 4.9.x; these tests give the lab fits because we're the only customer that does it.
I will look further into 300 386 for future products. I didn't spell all of that out in my previous email and I thank you for pointing out the error. Seems that I've been so busy lately that I've been doing everything in incomplete fashion...very frustrating. Chris > -----Original Message----- > From: Stone, Richard A (Richard) [SMTP:rsto...@lucent.com] > Sent: Thursday, January 24, 2002 10:58 AM > To: Chris Maxwell; emc-p...@majordomo.ieee.org > Subject: RE: Conducted Emissions---Sandy's Question and John's > Question > > Is this a telecommunications product? > if so, then need DC conducted Emissions > to new EU std. 300386. > Done from 20khz to 30mhz. > If product is ITE, then NO DC cond. is needed. > Richard, > > -----Original Message----- > From: Chris Maxwell [mailto:chris.maxw...@nettest.com] > Sent: Wednesday, January 23, 2002 5:21 PM > To: emc-p...@majordomo.ieee.org > Subject: RE: Conducted Emissions---Sandy's Question and John's > Question > > > > Hi guys, > > Remember, this is just my opinion. I work for a manufacturer, not a > test lab; so this is a side job (a HUGE side job); not my life. > > For John: > > We do test the DC input of our rack-mount 48VDC products for conducted > emissions. Many of our customers for these systems demand conducted > emissions testing. The reasoning here is that these systems will > operate from a DC "mains" which may operate many other products in the > same rack or room. We use the same limits as for AC mains. > > However, we do not test the conducted emissions of the DC ports of our > smaller products which run from wall-warts or bricks. For these > products, we test the conducted emissions at the AC interface of the > wall-wart or brick. > > For Sandy: > > When I test wall-warts for conducted emissions, I either plug them > into > the LISN directly or I use a short stub cable (about 6" long) made > from > Panel Components parts if I need to adapt the LISN output to a > wall-wart with a non-US plug configuration. > > I then try to dress the wall-wart's cable in the configuration shown > in > the standard for dressing line cords. > > I'm sure there are other methods; but at least you have one opinion. > > 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: CE-test - Ing. Gert Gremmen - ce-marking and more... > > [SMTP:cet...@cetest.nl] > > Sent: Wednesday, January 23, 2002 2:10 PM > > To: John Stonier; emc-p...@majordomo.ieee.org > > Subject: RE: Conducted emission testing for EN55022 > > > > Hi John, > > > > EN 55022:1994 does not speak about DC power supplies. Other > > standards do. > > Normally the appropriate measurements are done on the AC supply side > > af any applied DC-power supply. > > The pitfall is that a good RF attenuating in the supply may hide the > > conducted emissions from your EUT, while another power supply > > may lead to serious spectrum problems. > > Your problem, because power supply manufactueres do not > > specify RF isolation classes. > > I suggest you to apply the test described using a basic transformer > > rectifier combination + simple stabilization circuit (if required), > > thereby minimizing attenuation and maximizing RF feedtrough. > > Take care to bridge the rectifier diodes > > with capacitors, otherwize thay might create interference > themselves. > > > > Regards, > > > > Gert Gremmen, (Ing) > > Ce-test, qualified testing > > > > ================================== > > Web presence <http://www.cetest.nl/> > > CE-shop <http://www.cetest.nl/ce_shop.htm> > > /-/ Compliance testing is our core business /-/ > > ================================== > > > > -----Original Message----- > > From: owner-emc-p...@majordomo.ieee.org > > [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Stonier > > Sent: Wednesday, January 23, 2002 6:26 PM > > To: emc-p...@majordomo.ieee.org > > Subject: Conducted emission testing for EN55022 > > > > > > Hi folks > > > > My test lab's current interpretation of EN55022 is that DC Mains > > measurements are not required. Sections 5&6 specify measurements > done > > on mains ports, but do not specify whether it applies to AC or DC > > mains. There is a reference in section nine that specifies conducted > > disturbance is measured between the phase lead and the reference > > ground, as well as the neutral lead and the reference ground. Does > > anyone know whether DC measurements are required for this standard? > > > > John Stonier > > << File: Gert Gremmen.vcf >> > > ------------------------------------------- > 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.
