Re: IEC vs. EN
I read in !emc-pstc that Sam Wismer swis...@acstestlab.com wrote (in 000501c2b98b$166cb190$0b01000a@sam) about 'IEC vs. EN' on Sat, 11 Jan 2003: Thanks for the clarification. Is there any documentation to that affect, or is it common practice to apply the EN transition period to the IEC basic standard that may be called for in the applied generic or ps standard? Look at the introductory text of Annex ZA of the ENs. As I said, it's not very clear, but that is what we have. The transition period of any EN comes from the Commission, formally recorded in the Official Journal, although the dow in the Foreword of the EN is normally consistent with it. It's not just 'common practice' to apply it, it's the official procedure. Also, why do some Generic or PS standards call for the IEC version instead of the EN version, especially if called for from an EN version? Because CENELEC simply clones the IEC text without change (unless there are Common Modifications or CENELEC-only amendments), and implements the changes to the normative references by means of Annex ZA. -- 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
RMCEMC January Meeting Announcement
To all interested parties: The January Meeting will be:Power Supply Decoupling - How 'bout them vias? Presenter: T.J. (Bill) Ritenour Date : January 23 2003 Location : Front Range Community College, Westminster Colorado. Room Timberline (S117) Times : 5:30 -6:30 Social Hour at the Community College Cafeteria. 6:45 : Assemble at the room 7:00- 8:00 Presentation For full information please go to our website: http://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: IEC vs. EN
John, Thanks for the clarification. Is there any documentation to that affect, or is it common practice to apply the EN transition period to the IEC basic standard that may be called for in the applied generic or ps standard? Also, why do some Generic or PS standards call for the IEC version instead of the EN version, especially if called for from an EN version? Kind Regards, Sam Wismer Engineering Manager ACS, Inc. *Tel: (770) 831-8048 *Fax: (770) 831-8598 :Web: www.acstestlab.com *swis...@acstestlab.com From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of John Woodgate Sent: Saturday, January 11, 2003 8:43 AM To: emc-p...@majordomo.ieee.org Subject: Re: IEC vs. EN I read in !emc-pstc that Sam Wismer swis...@acstestlab.com wrote (in 001001c2b8c4$7df00d20$0b01000a@sam) about 'IEC vs. EN' on Fri, 10 Jan 2003: Case in point: EN 61000-4-4 Amd. 2 DoW for the superseded standard is 7/04 however EN55024 calls out IEC 61000-4-4. No, it only appears to. Because it's a clone of CISPR 24, its Normative References clause refers to IEC standards. But Annex ZA (not very clearly) replaces those references by the corresponding EN. Is IEC 61000-4-4 amd. 2 in force now and should it be used now when EN55024 is the applied standard? No. The EN transition period applies. Industry cannot work with standards that come into effect instantaneously and without prior notice. -- 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
Re: Fiber optic cable testing per EN 55022:1998 ?
I read in !emc-pstc that Juhasz, John (IndSys, GE Interlogix) john.juh...@ge.com wrote (in 4606624A2A8ABE41AFBA5F8306F2ECB203611C@F TWMLVEM01.e2k.ad.ge.com) about 'Fiber optic cable testing per EN 55022:1998 ?' on Fri, 10 Jan 2003: Is there anyone subscribed to this forum who is on the EN 55022 committee who could possibly shed light on this? Emission testing according to CISPR 22 requires the product to be configured in an attempt to maximise emissions. This means that all or most cables are connected, since most emission normally comes from cables. If some of these cables are fibre-optic, so be it. -- 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: Fiber optic cable testing per EN 55022:1998 ?
I read in !emc-pstc that drcuthbert drcuthb...@micron.com wrote (in cfefa50c9bcad21197470001fa7eba6b14121...@ntexchange05.micron.com) about 'Fiber optic cable testing per EN 55022:1998 ?' on Fri, 10 Jan 2003: Chris, some excellent points! My take on this is that a fiber optical cable has a cutoff frequency that is way above the RF frequencies we are concerned with. It just won't act as a waveguide for what we consider RF wavelengths. However, I think the optical cable certainly does leak a bit at light wavelengths. That's a surprise; what evidence do you have? It seems like one could perform light emissions and susceptibility testing. Now most of our light wave communications use cables. Sort of like if all RF communications was done in copper. With nothing intentionally radiated, and with the cables operating as very poor antennas, we might have no need for emission and susceptibility testing. On the other hand, the FCC does not regulate radiated optical communications. Maybe it's time to do so. With laser range finders, optical radar, IR remote control, and other primitive devices we are accumulating pollution of this part of the EM spectrum. Reminds me of spark transmitters spewing RF over a wide frequency range. Street lights are the spark transmitters of the visible spectrum. Shouldn't an optical cable with a metal sheath be treated just like any other cable? Hook it up during EMC testing? Yes, ALL cables, of whatever sort, are to be connected during testing. And as you point out, where is the transition from RF to light? RF generation methods (such as gyrotrons, seem to peter out at wavelengths of 1000 microns while visible light begins at 0.7 microns. There seems to be a huge no man's land in the EM spectrum. Look up 'far infra-red'. This part of the spectrum is flooded with thermal radiation from objects at normal temperatures. But sources and detectors do exist. -- 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: Fiber optic cable testing per EN 55022:1998 ?
I read in !emc-pstc that Chris Maxwell chris.maxw...@nettest.com wrote (in 83d652574e7af740873674f9fc12dbaaf7e...@utexh1w2.gnnettest.com) about 'Fiber optic cable testing per EN 55022:1998 ?' on Fri, 10 Jan 2003: So where is the crossover point? Does it have to do with skin depth? Maybe the photoelectric effect? Why don't we talk about photons at 1Ghz? Pragmatically, because there is no need to. Radio astronomers probably find that their parsecage may vary. (;-) Is it just because we don't have a material with the correct band gap to produce a 1Ghz photon? I don't know whether anything will work in a MASER at 1 GHz, but there is at 1.44 GHz, AIUI. Whether there could be an LED analogue working at much lower frequencies seems a good question. Electron energy transitions with low enough energies can occur between the outer shells of heavy atoms, but whether electron/hole recombinations can occur with such low energies is another matter.. On the other hand, can free electrons be conducted at light frequencies; or isn't there a material with enough of a skin depth at such frequencies? The conduction need not necessarily be in a solid. Anybody want to take a stab at enlightening(no pun intended) Oh, please intend it! us all on this one? Try sci.physics -- 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: IEC vs. EN
I read in !emc-pstc that Sam Wismer swis...@acstestlab.com wrote (in 001001c2b8c4$7df00d20$0b01000a@sam) about 'IEC vs. EN' on Fri, 10 Jan 2003: Case in point: EN 61000-4-4 Amd. 2 DoW for the superseded standard is 7/04 however EN55024 calls out IEC 61000-4-4. No, it only appears to. Because it's a clone of CISPR 24, its Normative References clause refers to IEC standards. But Annex ZA (not very clearly) replaces those references by the corresponding EN. Is IEC 61000-4-4 amd. 2 in force now and should it be used now when EN55024 is the applied standard? No. The EN transition period applies. Industry cannot work with standards that come into effect instantaneously and without prior notice. -- 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: European 3 Phase
I read in !emc-pstc that ggars...@us.tuv.com wrote (in OFE36B9C6E.F1FBF 989-on86256caa.0078d...@us.tuv.com) about 'European 3 Phase' on Fri, 10 Jan 2003: It may or may not be that the BSI document is better, I do not have a copy. The DoC (Dept of Commerce, in this case) document is free. In that case, it is infinitely better than the BSI document, which is not free. (;-) -- 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
