September meeting of RMCEMC EMC Society
To all interested parties: The September meeting of the RMCEMC IEEE Society is: The Mysteries of Grounding" on Tuesday, September 17, at the Courtyard by Mariott in Louisville, CO from 7:00pm to 8:00pm. The speaker will be Daryl Gerke of Kimmel Gerke Associates. For more details please go to our website at www.ieee.org/rmcemc Thank you Charles Grasso RMCEMC Vice-Chair --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: Telephone Headset
I read in !emc-pstc that soundsu...@aol.com wrote (in <11c.164cd2d4.2aa2 2...@aol.com>) about 'Telephone Headset' on Sat, 31 Aug 2002: >I would disagree on this one. A telephone is covered under EN 60950, >therefore the logical place for a telephone accessory would be the same >standard. Is a headset more like a telephone or more like a pair of headphones with a boom mic attached? > >Actually, this points out the need for the number of technical standards to >be minimized. As time goes on, the standards need to be integrated. It's >becoming harder and harder to tell audio/video equipment from ITE. There is >less and less justification for maintaining two sets of standards.Just my >opinion. IEC TC108 is currently engaged in combining IEC 60065 and IEC 60950 into one unified standard. You are allowed to hold your breath, but figure on holding it for ten years, at the current estimate. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: Electric Fence Controllers
Hi John Thanks for the response and the general update on the situation - as for the reference to the committee number, it was LEL/105 when I was there but I have'nt followed its progress since then. Regards John Allen - Original Message - From: "John Woodgate" To: Sent: Friday, August 30, 2002 11:26 AM Subject: Re: Electric Fence Controllers > > I read in !emc-pstc that John Allen wrote > (in <048001c24f9d$bd8895a0$0200a8c0@johnallen>) about 'Electric Fence > Controllers' on Thu, 29 Aug 2002: > >I once (about 12 years ago) had the dubious priviledge of being the Comittee > >Secretary for the UK BSI standards committee dealing with these beasts at > >British & International levels! > > What is now CPL/61? > > > >This question was never asked (that was probably before my time!) but it was > >my impression that these had fallen into the "too difficult" category and > >the Commission at the time of the Directive (1972/73)ducked the issue to > >ensure that it got agreed and that all the more common items got dealt > >with.. > > I think you are right. > > > >There certainly was (and probably still is - which is why the situation in > >the Directive does not appear to have changed) > > Item 10 of the Commission 'request for comment document 'LVD Update 1' > says: > QUOTE > General support to include "Electric fence controller" to the scope of > the LVD. > > France: Objection because the intended use of these products is not > inline with the aims of the directive. > > ENDQUOTE > > >a considerable difference of > >opinion between various countries as their safety and what the voltage and > >particular pulse tim/energy limits should apply. > > Indeed. Related to the perimeters of typical fields. > > > >Effectively, countries with small fields (like many in Europe) wanted low > >power units which probably were safe enough for general use, and possibly > >could have been kept within the LVD by some form of energy limitation kluge. > >However, countries with "big" - or "very big" (like Australia and New > >Zealand, etc.) - fields wanted units with lots more energy to avoid the > >deterent effect being substantially reduced by contact with conductive > >vegetation, etc. > > Of course, at agricultural shows in Britain, they are demonstrated > producing 5 cm sparks. I wonder how they do that. (;-) > > > >In the end (after I left BSI) I believe that some units were finally covered > >under Part 2 Sections of IEC 60335 - but I personally doubt that they are > >the high power versions. > > BS EN 60335-2-76. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > Interested in professional sound reinforcement and distribution? Then go to > http://www.isce.org.uk > PLEASE do NOT copy news posts to me by E-MAIL! > > --- > 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: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > 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: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Need services of Professional (PE) Mechanical Engineer registered in California
Dear group, A fabricator of shell and tube heat exchangers located in Stafford, Texas has a requirement for a California PE to perform a structural design check on supports on two vessels that will be erected at the Shell Oil Plant in Martinez, California. Could you recommend a California PE? - Robert - Robert A. Macy, PEm...@california.com 408 286 3985 fx 408 297 9121 AJM International Electronics Consultants 619 North First St, San Jose, CA 95112 --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Telephone Headset
A telephone headset is not within the scope of EN 60950, I think. EN 60065 is more applicable.<<< I would disagree on this one. A telephone is covered under EN 60950, therefore the logical place for a telephone accessory would be the same standard. Actually, this points out the need for the number of technical standards to be minimized. As time goes on, the standards need to be integrated. It's becoming harder and harder to tell audio/video equipment from ITE. There is less and less justification for maintaining two sets of standards.Just my opinion. Greg Galluccio www.productapprovals.com --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: PFC or Harmonic Current Limitations outside Europe
I read in !emc-pstc that Wagner, John P (John) wrote (in <4203D61676D0AE468AA5CEA90A891C13012FAB6A@cof110avexu4.global. avaya.com>) about 'PFC or Harmonic Current Limitations outside Europe' on Fri, 30 Aug 2002: >IEEE 519 is a Recommended Practice. It suggests voltage distortion limits at >the Point of Common Coupling based upon the customer load vs short circuit >current capabillity. It has nothing to do with paroduct harmonics. Well, that last sentence is a bit misleading. IEEE 519 certainly doesn't apply to individual products (unless someone had a single high-power product as his whole load), but the OP asks about 'PFC or Harmonic Current Limitations outside Europe', not specifically about limits for products. Clearly, the harmonic currents produced by the products on a site are responsible for *part* of the voltage distortion measured at the site's PCC, the rest being due to all the other non-linear loads on the system. >It is not a >regulation, but electric utilities may adopt it as a company requirement for >customers to meet. Yes, a 'de facto standard' or 'contractually enforced requirement'. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: PFC or Harmonic Current Limitations outside Europe
I read in !emc-pstc that Jim Eichner wrote (in <67C475A5ECE7D4118AEC0002B325CAB60176820C@BCMAIL1>) about 'PFC or Harmonic Current Limitations outside Europe' on Fri, 30 Aug 2002: >Re the US: Is IEEE519 given force in any way? Is there any agency, body, >or utility that is requiring IEEE519 compliance? > >Re Japan: Do you know the name/number of the "trial standard" and where I >can find a list of what types of products it applies to? Sorry, I don't know answers to either of those questions. I understand that some Canadian electricity suppliers (Hydro Quebec?) ARE applying IEEE 519 to selected customers. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
RE: PFC or Harmonic Current Limitations outside Europe
On Fri, 30 Aug 2002 12:36:50 -0700, Jim Eichner wrote: > Joshua: Re Japan, I didn't have much luck on the JEITA website. Can you > give me a specific reference (standard name/number, URL, etc.)? Also, is > there a list of what types of products this requirement applies to? http://home.jeita.or.jp/eps/harmonics/guideline/data/guideline_eng.pdf It is a "guideline" issued by Ministry of Economy, Trade and Industry, and I think it can be applied to almost any products if you want. Regards, Tom -- Tomonori Sato URL: http://member.nifty.ne.jp/tsato/ --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: PCI Brackets Problems
Beware that stainless steel has high impedance in GHz range, about 50 times higher than copper. That seriously degrades performance at high frequencies relative to BeCu or other good conductors. Neven > > Rick, > > Chomerics' Springline product line is an off-the-shelf solution: > > http://www.chomerics.com/products/cardcage.htm > > The spring-fingers on these one-piece gaskets are formed > toward the rear panel instead of toward the inside, where > damage due to snagging can be a problem. > > The only negative comment I have about this product concerns > the stainless steel material. In my experience, mixing stainless steel > and cold-rolled steel causes corrosion, even though the CRS is Zinc-plated. > Chomerics has offered to tin-plate the SS for us. > > Over the years, the design group I'm in has tried various > custom gaskets for this application--strips of tin-plated Be/Cu > or Phosphor-Bronze spring fingers between the PCI brackets > or fabric-over-foam gaskets, both of which have their > challenges. It seems we've come full-circle and have settled > on the above off-the-shelf solution. > > Good Luck, > Dan > > > X-MimeOLE: Produced By Microsoft Exchange V6.0.5762.3 > > content-class: urn:content-classes:message > > MIME-Version: 1.0 > > Subject: PCI Brackets Problems > > Date: Fri, 30 Aug 2002 08:54:09 -0600 > > X-MS-Has-Attach: > > X-MS-TNEF-Correlator: > > Thread-Topic: Curious about Tripp-Lite "isolation transformer" > > Thread-Index: AcJQM3jmO5hzvAL2Sl+Op3k/hH61TAAAMcqg > > From: > > To: > > Content-Transfer-Encoding: 8bit > > X-MIME-Autoconverted: from quoted-printable to 8bit by ruebert.ieee.org id > g7UEsCC20318 > > X-Resent-To: Multiple Recipients > > X-Listname: emc-pstc > > X-Info: Help requests to emc-pstc-requ...@majordomo.ieee.org > > X-Info: [Un]Subscribe requests to majord...@majordomo.ieee.org > > X-Moderator-Address: emc-pstc-appro...@majordomo.ieee.org > > > > > > I am fighting the age old problem of PCI brackets on various PC chassis not > making adequate electrical contact. Aperture leaks, especially at high > frequencies, is a continual problem, to say nothing about the flimsy > construction of the brackets. Has anyone had any success with the clips, > gaskets > and other EMI solutions? If you have any suggestions on types, or > manufacturers > please let me know. > > > > Thanks in advance... > > > > Rick Busche > > Evans & Sutherland > > rbus...@es.com > > > > --- > > 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: > > Ron Pickard: emc-p...@hypercom.com > > Dave Heald: davehe...@attbi.com > > > > 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: > > http://ieeepstc.mindcruiser.com/ > > Click on "browse" and then "emc-pstc mailing list" > > > --- > 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: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > 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: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" --- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
