Secondary Grounding
Group, This is a general product safety question: In order to avoid test failures during a single fault condition where the primary ground is removed, what design methods can be used to add a second ground to the system so that a ground is still provided even during a single fault condition of removing the primary ground? All responses are appreciated. Regards Joe Martin EMC/Product Safety Engineer Applied Biosystems marti...@appliedbiosystems.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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
Re: ESD Question
sb14bd8c@symbol.com, Sandy Mazzola mazzo...@symbol.com inimitably wrote: In EN 55024: 1998 Page 9 Paragraph 4.2.1, I found the following statement: The application of electrostatic discharges to the contacts of open connectors is not required by this publication My question is twofold has everybody interpreted this to mean that no air discharges or contact discharges are required to the connector or pins of the open connector. And secondly if the answer to the above is no discharges of any type are required, what other publications would require either air or contact discharges to open connectors. The point that is being made in EN55024 is that some people interpreted the Basic Standard, IEC61000-4-2, as requiring the contacts of connectors to be zapped, which is pretty unlikely in practice and almost impossible to cope with in many cases. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Why not call a vertically- applied manulo-pedally-operated quasi-planar chernozem-penetrating and excavating implement a SPADE? --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
RE: Ethernet baluns
try these links http://www.etslan.com/Download/cat2k_ld.pdf http://www.cliffordvt.com/sande_text.html http://www.batm.de/en/products/balun/p05.htm the last one seems to have the easiest one to find There are lots more search yahoo +10base2 +balun Jim Allan Manager, Engineering Services Milgo Solutions LLC 1619 N Harrison Parkway Sunrise, FL, 33323 E-mail james_al...@milgo.com Phone (954) 846-3720 Fax (954) 846-5693 -Original Message- From: Paolo Roncone [SMTP:paolo...@tin.it] Sent: Wednesday, May 30, 2001 11:54 AM To: emc-p...@majordomo.ieee.org Subject: Ethernet baluns Hi everyone: I'm looking for a passive (no ac/dc power supply needed) balun to convert from an Ethernet 10b2 (unbalanced coax 50 ohm) to an Ethernet 10bT (balanced, twisted pair, UTP, 100 ohm). Anyone knows if this kind of box exists ? So far I came up with a perfect match, but for the impedance of the coax connector (75 ohms instead of 50 ohms). We need this in order to improve the EMC behavior of the 10b2 Ethernet that we have to live with (you bet it's a real damn pain in the neck EMC-wise !!!). Thanks Paolo --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall, --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
RE: Ethernet baluns
Paolo, You need a mini hub with 10Base2 and 10BaseT connections. A balun will not work because 10BastT is a 4-wire connection (T1, T2 R1, R2) whereas 10Base2 is a 2-wire connection. Also 10b2 supports daisy chain but 10bT is point-to-point. What kinds of EMC problems are you having with 10b2? Emissions or immunity? David -Original Message- From: Paolo Roncone [mailto:paolo...@tin.it] Sent: Wednesday, May 30, 2001 11:54 AM To: emc-p...@majordomo.ieee.org Subject: Ethernet baluns Hi everyone: I'm looking for a passive (no ac/dc power supply needed) balun to convert from an Ethernet 10b2 (unbalanced coax 50 ohm) to an Ethernet 10bT (balanced, twisted pair, UTP, 100 ohm). Anyone knows if this kind of box exists ? So far I came up with a perfect match, but for the impedance of the coax connector (75 ohms instead of 50 ohms). We need this in order to improve the EMC behavior of the 10b2 Ethernet that we have to live with (you bet it's a real damn pain in the neck EMC-wise !!!). Thanks Paolo --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall, --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
[Fwd: Search for a Gtem Cell]
Forwarded for John Kehs (jk...@witusa.com). Please direct all responses to John. Regards, David Heald Original Message Subject: Search for a Gtem Cell List-Post: emc-pstc@listserv.ieee.org Date: Wed, 30 May 2001 07:18:40 -0400 From: Kehs, John jk...@witsusa.com To: 'emc-p...@ieee.org' emc-p...@ieee.org I am looking to purchase a Gtem cell that will handle an EUT up to 18 square. If you have one or know of one please let me know. Thanks. John P. Kehs Jr. Manager, Windermere Calibration Repair Center (WCRC) 401 Defense Hwy. Annapolis, MD 21401 410-266-1880Fax 410-266-1751 www.witscrc.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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
Ethernet baluns
Hi everyone: I'm looking for a passive (no ac/dc power supply needed) balun to convert from an Ethernet 10b2 (unbalanced coax 50 ohm) to an Ethernet 10bT (balanced, twisted pair, UTP, 100 ohm). Anyone knows if this kind of box exists ? So far I came up with a perfect match, but for the impedance of the coax connector (75 ohms instead of 50 ohms). We need this in order to improve the EMC behavior of the 10b2 Ethernet that we have to live with (you bet it's a real damn pain in the neck EMC-wise !!!). Thanks Paolo --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
RE: EMI from Electrical wheelchairs
Francois: I was looking at the manual on an electric wheelchair about two years ago. I was pleased to see that the manual contained a Declaration of Conformity (but I sure don't remember the EN's it claimed). I also found it interesting that the manual specifically stated that the wheelchair also was compliant with a 20 V/M field from (IIRC) 30 MHz to 1000 MHz. That's nice, since personal electronic emitters (cell phones, PCS, handheld CB sets) typically generate about 5 to 10 V/M at about 1 to 2 meters distance. That increases the chances that the wheelchair user can safely use a cell phone without spinning in circles (or worse). Regards, Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis -Original Message- From: Francois Venter [mailto:fven...@alcatel.altech.co.za] Sent: Tuesday, May 29, 2001 11:28 PM To: emc-p...@majordomo.ieee.org Subject: EMI from Electrical wheelchairs Hi All Can anybody please tell me where I can find information on EMI from and interfering with Electric wheelchairs. I recently had a question from somebody after a patient with multiple sclerosis seemed to be affected by something when placed in an electric wheelchair. In a normal wheelchair his movements etc seemed normal for a person with his condition. In the electric wheelchair his condition seemed to be much worse. Anybody heard about similar cases? Francois Venter Alcatel Altech Telecoms PO Box 462, Boksburg, 1460, South Africa Tel +27 (0)11 899-6064 Fax +27 (0)11 899-6590 fven...@alcatel.altech.co.za --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
RE: HERP / HERF
John: That site is a somewhat quirky reference. The Google search engine hit that page, and just what was listed on the page was enough for me to use it as a pointer for Hjalmar. If you look at the host domain: http://liun.hektik.org/ you find that it's the Long Island Underground Network, and then follow the hightech link: http://liun.hektik.org/hightech/ and you can find all kinds of dubious information on Tesla rays, cross-field antennas, ghost detectors, spirit communication and projected energy weapons. Uhh, it's not exactly a hard-core engineering site! Links on such sites tend to be very ephemeral. grin Regards, Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis -Original Message- From: Allen, John [mailto:john.al...@uk.thalesgroup.com] Sent: Wednesday, May 30, 2001 12:15 AM To: Price, Ed; 'Hjálmar Árnason'; emc-p...@majordomo.ieee.org Subject: RE: HERP / HERF Folks Unless someone can tell me where I have gone wrong, the first of Ed's URL's (liun.hektik) seems to be a dead-end as all I get are lost links. John Allen. -Original Message- From: Price, Ed [mailto:ed.pr...@cubic.com] Sent: 29 May 2001 16:23 To: 'Hjálmar Árnason'; emc-p...@majordomo.ieee.org Subject: RE: HERP / HERF Hjalmar: Google http://www.google.com got 13,100 hits searching on HERF -cigar -hereford (High Energy RF; fuel is mentioned at only a couple of sites, this may take a bit of reading!). Try: http://liun.hektik.org/hightech/herf/58.htm http://www.dnd.ca/admfincs/subjects/cfao/034-51_e.asp HERP is a lot more selective! Try: http://www.nawcad.navy.mil/atlantic_ranges/e3/herp.cfm SPAWAR has something at: http://www-chas.spawar.navy.mil/code/323/mainpage.html Also, look at Paragraphs 5.8.1 5.8.2 of Mil-Std-464. There's a bunch of references at: http://www.acq-ref.navy.mil/turbo2/topics/x.cfm Regards, Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis -Original Message- From: Hjálmar Árnason [mailto:hjal...@tetra.is] Sent: Tuesday, May 29, 2001 4:35 AM To: emc-p...@majordomo.ieee.org Subject: HERP / HERF Hi all can someone inform me where I am able to find information about HERP ( Hazard of EMR to Personnel ) and HERF ( Hazard of EMR to Fuel ). either standards / regulations or some written material which sheds light on these. Hjalmar STIKLA ehf Hjalmar Arnason Manager Technical Operations Hlidasmara 11 201 Kopavogi ph. 5455703 fax 5455709 gsm. 8626265 nmt. 8526265 hjal...@tetra.is --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
ESD Question
Hi all, In EN 55024: 1998 Page 9 Paragraph 4.2.1, I found the following statement: The application of electrostatic discharges to the contacts of open connectors is not required by this publication My question is twofold has everybody interpreted this to mean that no air discharges or contact discharges are required to the connector or pins of the open connector. And secondly if the answer to the above is no discharges of any type are required, what other publications would require either air or contact discharges to open connectors. Thanks Sandy Mazzola Santo Mazzola Regulatory Engineer Symbol Technologies Inc 1 Symbol Plaza Holtsville, N. Y. 11742-1300 Phone: (631) 738-5373 Fax: (631) 738-3318 E-mail: mazzo...@symbol.com BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Mazzola, Sandy TEL;WORK:(516) 738-5373 EMAIL;WORK;PREF;NGW:mazzo...@symbol.com N:Mazzola;Sandy X-GWUSERID:MazzolaS END:VCARD BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Mazzola, Sandy TEL;WORK:(516) 738-5373 EMAIL;WORK;PREF;NGW:mazzo...@symbol.com N:Mazzola;Sandy X-GWUSERID:MazzolaS END:VCARD
HERP / HERF .. Thanks
Thank you all for your response.. I think I've got what I need now Again thanks.. br - Hjálmar STIKLA ehf Hjalmar Arnason Manager Technical Operations Hlidasmara 11 201 Kopavogi ph. 5455703 fax 5455709 gsm. 8626265 nmt. 8526265 hjal...@tetra.is --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
EMI from Electrical wheelchairs
Hi All Can anybody please tell me where I can find information on EMI from and interfering with Electric wheelchairs. I recently had a question from somebody after a patient with multiple sclerosis seemed to be affected by something when placed in an electric wheelchair. In a normal wheelchair his movements etc seemed normal for a person with his condition. In the electric wheelchair his condition seemed to be much worse. Anybody heard about similar cases? Francois Venter Alcatel Altech Telecoms PO Box 462, Boksburg, 1460, South Africa Tel +27 (0)11 899-6064 Fax +27 (0)11 899-6590 fven...@alcatel.altech.co.za --- 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 Healddavehe...@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: http://www.rcic.com/ click on Virtual Conference Hall,
