Environmental question
Hello Group, We already know the standards related to human exposure to electromagnetic fields (e.g. ANSI/IEEE). However some people have asked us if there is any standard/recommendations limiting the exposure of forests, lakes/rivers, animals, etc to RF fields. Do you know any FDA and EPA (or another agency) that regulate this subject of RF fields incidence? Example: Imagine a radio-base station (mobile comm) or antenna (TV or radio) put in the middle of a forest, where there is not human habitation, but we have animals, trees and waters. Is there any standard/recommendation related to this case (only for non-ionizing radiation, ie, EM radiation). Thanks in advance and Regards, Muriel --- 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: case of units
Doug- Are you sure you don't mean M used as a multiplier that means 1000? I have seen some old radio schematics (pre-WWII) that had 50 M and 100 M resistors (5 and 10 ohms). Values greater than 1 million ohms were given as 2 Meg, etc. Don Borowski, PE Schweitzer Engineering Labs Pullman, WA Doug McKean dmck...@corp.auspex.com on 06/24/2002 12:33:24 PM Please respond to Doug McKean dmck...@corp.auspex.com To: EMC-PSTC Discussion Group emc-p...@majordomo.ieee.org cc:(bcc: Don Borowski/SEL) Subject: Re: case of units Just don't talk to some old purchasing types about k. It doesn't mean base 1,000 in purchasing land. More like base 1,000,000. I ordered some resistors in qty = 1k. It got kicked back to my supervisor because (1) when I multiplied out the final cost, it was wrong and (2) there was no justification for buying one million resistors. Regards, Doug McKean --- 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 e-mail may contain SEL confidential information. The opinions expressed are not necessarily those of SEL. Any unauthorized disclosure, distribution or other use is prohibited. If you received this e-mail in error, please notify the sender, permanently delete it, and destroy any printout. Thank you. --- 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: case of units
Robert and EMC-PSTC, According to some books of physics (e.g., Halliday and Resnick) and Web pages concerning measurements: http://www.chemie.fu-berlin.de/chemistry/general/si_en.html#prefixes The right usage of kilohertz is kHz, and not KHz. Best Regards Muriel - Original Message - From: Robert Macy m...@california.com To: Price, Ed ed.pr...@cubic.com; emc-p...@majordomo.ieee.org Sent: Monday, June 24, 2002 3:17 PM Subject: Re: case of units Still use KHz For me it's a logical carrier over from small letter = small value capital letter = large value mOhm means milli Ohm NOT mega Ohm mHz is milliHertz KHz is kilo Hertz (note magnifier is larger than one) MHz is megaHertz and so on - 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 -Original Message- From: Price, Ed ed.pr...@cubic.com To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org Date: Monday, June 24, 2002 8:24 AM Subject: RE: case of units -Original Message- From: Brent DeWitt [mailto:bdew...@ix.netcom.com] Sent: Sunday, June 23, 2002 7:04 PM To: emc-p...@majordomo.ieee.org Subject: case of units I've always found it interesting that the small k is the only lower case letter used for multipliers greater than unity. I presume it is because the temperature folks got there first with Lord Kelvin's initial. Too bad really since kilo has a linguistic meaning for numbers and Kelvin is just a name. Also rather interesting that we have no trouble using G for both Giga and Gauss. Just Sunday evening thoughts. Brent DeWitt Brent: For years, I had always written kiloHertz as KHz. Then, as a hirling, I bumped up against the Information Technology Group at General Dynamics Electronics Division. I noticed that all my text came back using kHz. After a few cycles of this, I decided to follow up on the cause. I found that they worked to a bureaucratic style manual, which dictated the style for abbreviations and technical terms. I had the temerity to ask who wrote the style manual, and why KHz was rendered as kHz. They finally produced a Mil-Std, which had a list of acronyms and special terms. And, there on the list, was kHz! No explanation, just kHz. So I asked them if maybe the Mil-Std was just a typo error, and that shouldn't we allow logic to prevail? No, because if they did that, someone might think the abbreviation actually meant degrees Kelvin Hertz. They won. Lately, after many more years of continuing to personally use KHz (and having re-educated my MS Word about my preference), I find that I am wearying of the explanations, and have started to use kHz. Yup, they won. 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 --- 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:
RE: ESAs certification to 95/54/EC
We have been talking to the UK's Vehicle Certification Agency regarding the Automotive EMC Directive (AEMCD). Their US office website is attached, and the contact I've got is Mark Rushton. There are labs in the US with accreditation to do this testing. We're going to use Acme Testing in Acme Washington (website also attached). Jim Eichner, P.Eng. Manager, Engineering Services Xantrex Technology Inc. Mobile Power phone: (604) 422-2546 fax: (604) 420-1591 e-mail: jim.eich...@xantrex.com web: www.xantrex.com Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -Original Message- From: Fang Han [mailto:f...@qualcomm.com] Sent: Monday, June 24, 2002 10:45 AM To: emc-p...@majordomo.ieee.org Subject: ESAs certification to 95/54/EC Hi Colleagues, It looks like all products for vehicle application, even they have been certified to EMC Directive or RTTE Directive, must be certified to 95/54/EC (vehicle EMC directive) before Oct 1, 2002. It seems to me that the certification route for vehicle EMC directive is different with EMC directive or RTTE directive certification. I am looking for an accredited lab/body that is authorized to certify ESAs products to 95/54/EC. I wonder if all these labs/bodies are located in Europe or there are some in USA. I understand that these labs/bodies should be authorized by the Ministry of Transportation of a EU member state. A certification done by such a lab will be accepted by all other EU member states. I appreciate it very much if someone familiar with this can shed some light. Thanks a lot, Fang Vehicle Certification Agency.zlt Description: Binary data Acme Testing.zlt Description: Binary data
Re: case of units
OK, I'll bite. If KHz means kilohertz, what does kHz mean? Don Borowski, PE Schweitzer Enginering Labs Pullman, WA Robert Macy m...@california.com on 06/24/2002 11:17:18 AM Please respond to Robert Macy m...@california.com To: Price, Ed ed.pr...@cubic.com, emc-p...@majordomo.ieee.org cc:(bcc: Don Borowski/SEL) Subject: Re: case of units Still use KHz For me it's a logical carrier over from small letter = small value capital letter = large value mOhm means milli Ohm NOT mega Ohm mHz is milliHertz KHz is kilo Hertz (note magnifier is larger than one) MHz is megaHertz and so on - 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 -Original Message- From: Price, Ed ed.pr...@cubic.com To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Monday, June 24, 2002 8:24 AM Subject: RE: case of units -Original Message- From: Brent DeWitt [mailto:bdew...@ix.netcom.com] Sent: Sunday, June 23, 2002 7:04 PM To: emc-p...@majordomo.ieee.org Subject: case of units I've always found it interesting that the small k is the only lower case letter used for multipliers greater than unity. I presume it is because the temperature folks got there first with Lord Kelvin's initial. Too bad really since kilo has a linguistic meaning for numbers and Kelvin is just a name. Also rather interesting that we have no trouble using G for both Giga and Gauss. Just Sunday evening thoughts. Brent DeWitt Brent: For years, I had always written kiloHertz as KHz. Then, as a hirling, I bumped up against the Information Technology Group at General Dynamics Electronics Division. I noticed that all my text came back using kHz. After a few cycles of this, I decided to follow up on the cause. I found that they worked to a bureaucratic style manual, which dictated the style for abbreviations and technical terms. I had the temerity to ask who wrote the style manual, and why KHz was rendered as kHz. They finally produced a Mil-Std, which had a list of acronyms and special terms. And, there on the list, was kHz! No explanation, just kHz. So I asked them if maybe the Mil-Std was just a typo error, and that shouldn't we allow logic to prevail? No, because if they did that, someone might think the abbreviation actually meant degrees Kelvin Hertz. They won. Lately, after many more years of continuing to personally use KHz (and having re-educated my MS Word about my preference), I find that I am wearying of the explanations, and have started to use kHz. Yup, they won. 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 --- 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 e-mail may contain SEL confidential information. The opinions expressed are not necessarily those of SEL. Any unauthorized disclosure, distribution or other use is prohibited. If you received this e-mail in error, please notify the sender, permanently delete it, and destroy any printout. Thank you. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc
Re: case of units
Just don't talk to some old purchasing types about k. It doesn't mean base 1,000 in purchasing land. More like base 1,000,000. I ordered some resistors in qty = 1k. It got kicked back to my supervisor because (1) when I multiplied out the final cost, it was wrong and (2) there was no justification for buying one million resistors. Regards, Doug McKean --- 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: case of units
Still use KHz For me it's a logical carrier over from small letter = small value capital letter = large value mOhm means milli Ohm NOT mega Ohm mHz is milliHertz KHz is kilo Hertz (note magnifier is larger than one) MHz is megaHertz and so on - 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 -Original Message- From: Price, Ed ed.pr...@cubic.com To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Monday, June 24, 2002 8:24 AM Subject: RE: case of units -Original Message- From: Brent DeWitt [mailto:bdew...@ix.netcom.com] Sent: Sunday, June 23, 2002 7:04 PM To: emc-p...@majordomo.ieee.org Subject: case of units I've always found it interesting that the small k is the only lower case letter used for multipliers greater than unity. I presume it is because the temperature folks got there first with Lord Kelvin's initial. Too bad really since kilo has a linguistic meaning for numbers and Kelvin is just a name. Also rather interesting that we have no trouble using G for both Giga and Gauss. Just Sunday evening thoughts. Brent DeWitt Brent: For years, I had always written kiloHertz as KHz. Then, as a hirling, I bumped up against the Information Technology Group at General Dynamics Electronics Division. I noticed that all my text came back using kHz. After a few cycles of this, I decided to follow up on the cause. I found that they worked to a bureaucratic style manual, which dictated the style for abbreviations and technical terms. I had the temerity to ask who wrote the style manual, and why KHz was rendered as kHz. They finally produced a Mil-Std, which had a list of acronyms and special terms. And, there on the list, was kHz! No explanation, just kHz. So I asked them if maybe the Mil-Std was just a typo error, and that shouldn't we allow logic to prevail? No, because if they did that, someone might think the abbreviation actually meant degrees Kelvin Hertz. They won. Lately, after many more years of continuing to personally use KHz (and having re-educated my MS Word about my preference), I find that I am wearying of the explanations, and have started to use kHz. Yup, they won. 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 --- 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
ESAs certification to 95/54/EC
Hi Colleagues, It looks like all products for vehicle application, even they have been certified to EMC Directive or RTTE Directive, must be certified to 95/54/EC (vehicle EMC directive) before Oct 1, 2002. It seems to me that the certification route for vehicle EMC directive is different with EMC directive or RTTE directive certification. I am looking for an accredited lab/body that is authorized to certify ESAs products to 95/54/EC. I wonder if all these labs/bodies are located in Europe or there are some in USA. I understand that these labs/bodies should be authorized by the Ministry of Transportation of a EU member state. A certification done by such a lab will be accepted by all other EU member states. I appreciate it very much if someone familiar with this can shed some light. Thanks a lot, Fang
RE: case of units
-Original Message- From: Brent DeWitt [mailto:bdew...@ix.netcom.com] Sent: Sunday, June 23, 2002 7:04 PM To: emc-p...@majordomo.ieee.org Subject: case of units I've always found it interesting that the small k is the only lower case letter used for multipliers greater than unity. I presume it is because the temperature folks got there first with Lord Kelvin's initial. Too bad really since kilo has a linguistic meaning for numbers and Kelvin is just a name. Also rather interesting that we have no trouble using G for both Giga and Gauss. Just Sunday evening thoughts. Brent DeWitt Brent: For years, I had always written kiloHertz as KHz. Then, as a hirling, I bumped up against the Information Technology Group at General Dynamics Electronics Division. I noticed that all my text came back using kHz. After a few cycles of this, I decided to follow up on the cause. I found that they worked to a bureaucratic style manual, which dictated the style for abbreviations and technical terms. I had the temerity to ask who wrote the style manual, and why KHz was rendered as kHz. They finally produced a Mil-Std, which had a list of acronyms and special terms. And, there on the list, was kHz! No explanation, just kHz. So I asked them if maybe the Mil-Std was just a typo error, and that shouldn't we allow logic to prevail? No, because if they did that, someone might think the abbreviation actually meant degrees Kelvin Hertz. They won. Lately, after many more years of continuing to personally use KHz (and having re-educated my MS Word about my preference), I find that I am wearying of the explanations, and have started to use kHz. Yup, they won. 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 --- 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
Slotted Busbars.
Dear Group, thank you all for you speedy but varied answers. Best regards, David Sproul,
Formaldehyde requirements for Europe
Hello Everyone, I am new to the list and was hoping that someone could help me with the following question. I have been tasked with researching Formaldehyde out gasssing regulations for products utilizing composite ( particle board) material. Our speaker cabinets utilize this material. I have recently received some information concerning German regulations which seems to indicate that our speakers must be subjected to testing by a recognized authority in Germany. Does anyone have any information on this subject or have any sources they can direct me too? I am happy to share the limited info I have so if you are interested please e-mail me privately. Thanks in advance for your help. regards, John Tyra Design Assurance Engineering, Product Safety Regulatory Manager Bose Corporation The Mountain, M.S.-450 Framingham, MA 01701-9168 508-766-1502 Phone 508-766-1145 Fax john_t...@bose.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: TOUCH CURRENT LIMIT
Xing Hello! Take a look at IEC 60990, Methods of measurement of touch current and protective conductor current. The limits in IEC 60 950 are based on this particular standard. Best Regards This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail message in error, please return by forwarding the message and its attachments to the sender. PETER S. MERGUERIAN Technical Director I.T.L. (Product Testing) Ltd. 26 Hacharoshet St., POB 211 Or Yehuda 60251, Israel Tel: + 972-(0)3-5339022 Fax: + 972-(0)3-5339019 Mobile: + 972-(0)54-838175 http://www.itl.co.il http://www.itl.co.il/ http://www.i-spec.com http://www.i-spec.com/ -Original Message- From: xingwb [mailto:xin...@cesi.ac.cn] Sent: Monday, June 24, 2002 1:57 AM To: emc-p...@majordomo.ieee.org Cc: Rich Nute Subject: TOUCH CURRENT LIMIT Dear colleagues I have a question regarding touch current limit of IEC 60950? We can read from table 5A of IEC60950:1999: Touch current limit for accessible parts and circuits not connected to protective earth: 0.25 mA question 1 : How does it (0.25mA) come from and what it is based on? based on IEC479? OR other source why it is not 0.5mA(based on IEC60479) question 2 :for hand-held equipment it is 0.75mA why ? Please shed some light for above questions Any comments are appreciated Best Regards Xing weibing 2002-06-24
FCC part 68 vs CTR21
Hi Group, Just to say thank you for your helpful replies. It is very much appreciated. Next time any of you are in Scotland I will buy you a wee half of whisky! Kind Regards Alex McNeil Principal Engineer Tel: +44 (0)131 479 8375 Fax: +44 (0)131 479 8321 email: alex.mcn...@ingenicofortronic.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
(Fwd) TOUCH CURRENT LIMIT
Dear Xing weibing, I can't give you a direct answer to your questions, but you may find the discussion in sub-clause 19.3 of the General Guidance and Rationale in IEC 60601-1 (Electrical Medical Equipment) of interest. There is information on the effect of electrical currents on the human body, as well as a list of references. Regards, Jon Griver www.601help.com The Medical Device Developers Guide to IEC 60601-1 --- Forwarded message follows --- Dear colleagues I have a question regarding touch current limit of IEC 60950? We can read from table 5A of IEC60950:1999: Touch current limit for accessible parts and circuits not connected to protective earth: 0.25 mA question 1 : How does it (0.25mA) come from and what it is based on? based on IEC479? OR other source why it is not 0.5mA(based on IEC60479) question 2 :for hand-held equipment it is 0.75mA why ? Please shed some light for above questions Any comments are appreciated Best Regards Xing weibing 2002-06-24 --- End of forwarded message --- --- 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
case of units
I've always found it interesting that the small k is the only lower case letter used for multipliers greater than unity. I presume it is because the temperature folks got there first with Lord Kelvin's initial. Too bad really since kilo has a linguistic meaning for numbers and Kelvin is just a name. Also rather interesting that we have no trouble using G for both Giga and Gauss. Just Sunday evening thoughts. Brent DeWitt -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of bogdan matoga Sent: Saturday, June 22, 2002 6:55 PM To: Robert Wilson Cc: TM66; emc-p...@majordomo.ieee.org Subject: Re: SI Unit for volume Bob: When you go for SI then please stay with the convention, i.e. kilowatt is abbreviated as kW and not KW. We are hopefully beyond the time when MAmp was supposed to mean milliampere. Regards, Bogdan. 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
TOUCH CURRENT LIMIT
Dear colleagues I have a question regarding touch current limit of IEC 60950? We can read from table 5A of IEC60950:1999: Touch current limit for accessible parts and circuits not connected to protective earth: 0.25 mA question 1 : How does it (0.25mA) come from and what it is based on? based on IEC479? OR other source why it is not 0.5mA(based on IEC60479) question 2 :for hand-held equipment it is 0.75mA why ? Please shed some light for above questions Any comments are appreciated Best Regards Xing weibing 2002-06-24
