Re: Vietnam regulations?
Hans, We have recently established an agency within Hanoi for the purpose of obtaining approval of telecom and wireless products thru the Post and Telecom Quality Control Centre of the Vietnamese DGPT. We can confirm that E1 (not T1) and DSL approval requirements exist, which include testing at VNPT's technology Centre or VLAB, along with paperwork assessment of safety and EMC reports (more interested in interworking testing), the positive outcome being the issuance by DGPT of a Standard Compatibility Certificate. If the products utilize IP, then a paperwork only assessment is required, with a confirmation letter provided by DGPT confirming that the product is exempt from certification. This letter must then be provided to Vietnamese customs at the time of product importation. If you have any questions our would like to obtain a quotation for our services, please feel free to contact me. Best Regards, Martin. Martin Garwood Principal Consultant BWS Tech Inc, Approval Specialists - Original Message - From: Hans Mellberg emcconsult...@yahoo.com To: Scott Lacey sco...@world.std.com; Gabi Hoffknecht gab...@simex.ca Cc: emc-p...@majordomo.ieee.org Sent: Thursday, February 21, 2002 9:40 AM Subject: Vietnam regulations? What, if any, requirements does Vietnam have for EMC, Safety and telco for DSL/E1/T1 type of products? Thanks in advance = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: EN61000-6-2
I could be wrong -- need to go through the exercise and see if it makes sense Tell me if I'm missing something critical... 50ohm source, line, load and all connectors = no VSWR; adding any 50 ohm attenuator will not increase the VSWR. If any of the above is NOT 50 ohms, there will be reflections. So, since there seems to be some VSWR to start with, we need to assume one of the above is not 50 ohms. If the load is a high impedance, you are correct and adding an attenuator will make the VSWR look better from the source end (keeping in mind, the VSWR between the attenuator and load doesn't change). The attenuator in parallel with the high impedance load will bring the total impedance closer to 50 ohms -- not sure, but it may be that the larger the attenuator the better the match will become?? Have to think on that If the load is a low impedance, say 10 ohms, adding the attenuator will add impedance as far as the source is concerned, so again, the VSWR will appear to improve, and again, the VSWR between the attenuator and load remains high. Depending on the attenuator design, it also seems a bigger attenuator (more dB) will improve the VSWR more. So if I stick with that line of thinking -- adding an attenuator when the load is mis-matched will always reduce the VSWR at the source but never between the line and the load! (Obvious question: does the VSWR at the load matter?? Seems there would be some losses, and in some cases it could mean a lot, but that's for another day.) Mike Hopkins -Original Message- From: Jacob Schanker [mailto:schan...@frontiernet.net] Sent: Wednesday, February 20, 2002 4:01 PM To: Mike Hopkins; 'Colgan, Chris'; EMC Forum Subject: Re: EN61000-6-2 Mike: My experience tells me that an attenuator designed for the same impedance as the transmission line, will **always** improve the VSWR at the source, irrespective of how bad or good the load VSWR is. (It is most helpful to think in terms of reflection coefficients rather than VSWR directly, to appreciate this.) Your comment implies otherwise, and I wonder if you could expand on what you've said - perhaps an example of where it doesn't help (not a given)? Regards, Jacob Z. Schanker, P.E. 65 Crandon Way Rochester, NY 14618 Phone: 585 442 3909 Fax: 585 442 2182 j.schan...@ieee.org - Original Message - From: Mike Hopkins mhopk...@thermokeytek.com To: 'Colgan, Chris' chris.col...@tagmclaren.com; EMC Forum emc-p...@ieee.org Sent: Wednesday, February 20, 2002 1:48 PM Subject: RE: EN61000-6-2 | | Seems an attenuator COULD improve matching and VSWR if it then became a | significant part of the load impedance; it isn't a given. On the other | hand, adding the attenuator should NOT cause the VSWR to become very high | unless it is not a 50 ohm attenuator.. | | Mike Hopkins | | -Original Message- | From: Colgan, Chris [mailto:chris.col...@tagmclaren.com] | Sent: Wednesday, February 20, 2002 4:26 AM | To: EMC Forum | Subject: RE: EN61000-6-2 | | | | In my experience attenuators improve impedance matching and hence VSWR. | There must be something wrong with your set up. | | Regards | | Chris Colgan | Compliance Engineer | TAG McLaren Audio Ltd | The Summit, Latham Road | Huntingdon, Cambs, PE29 6ZU | *Tel: +44 (0)1480 415 627 | *Fax: +44 (0)1480 52159 | * Mailto:chris.col...@tagmclaren.com | * http://www.tagmclaren.com | | | -Original Message- | From: Sam Wismer [SMTP:swis...@bellsouth.net] | Sent: 19 February 2002 16:52 | To: EMC Forum | Subject: EN61000-6-2 | | Hi Group, | | EN 61000-6-2 calls for severity level 3, or 10Vrms for conducted | disturbances. This equates to 37dBm which is 7dB higher than the upper | limit my receiver will handle (during calibration of the CDN). I've tried | to use an attenuator and compensate for it in my readings, but this | creates a high VSWR. Any ideas how to extend the dynamic range of my | receiver without causing high VSWR? | | | | | | Kind Regards, | | | | | | Sam Wismer | | Engineering Manager | | ACS, Inc. | | | | Phone: (770) 831-8048 | | Fax: (770) 831-8598 | | | | Web: www.acstestlab.com | | | | | | ** |Please visit us at www.tagmclaren.com | ** | | The contents of this E-mail are confidential and for the exclusive | use of the intended recipient. If you receive this E-mail in error, | please delete it from your system immediately and notify us either | by E-mail, telephone or fax. You should not copy, forward or | otherwise disclose the content of the E-mail. | | TAG McLaren Audio Ltd | The Summit, 11 Latham Road | Huntingdon, Cambs, PE29 6ZU | Telephone : 01480 415600 (+44 1480 415600) | Facsimile : 01480 52159 (+44 1480 52159) | | ** |Please visit us at www.tagmclaren.com |
Vietnam regulations?
What, if any, requirements does Vietnam have for EMC, Safety and telco for DSL/E1/T1 type of products? Thanks in advance = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
double-pole switching and fusing
Hi John: I read in !emc-pstc that Crabb, John jo...@exchange.scotland.ncr.com wrote (in B6CD5947CF30D411A1350050DA4B75FF03C2341C@sgbdun200.scotland.n cr.com) about 'South Korean Power System', on Wed, 20 Feb 2002: Typically I would expect IT equipment to be safe if line and neutral were reversed, except for the issues relating to a single pole disconnect device and fusing. See Tables 2E and 2F in IEC/EN60950:2000. Double-pole switching and fusing is almost always necessary in practice. Tables 2E and 2F are invoked only by the Note 2 to Sub-clause 2.7.4. A Note is informative, not a requirement. Note 2 specifically addresses the situation where protection devices are integral to the equipment. It further states that the examples are not necessarily valid for protective devices in the building installation. For earth faults in plug-and-socket-connected equipment, the equipment need not include double-pole fusing as the protective device in the building installation provides the earth-fault protection. This is the basis for the robustness requirements of the equipment protective earthing circuit. So, in practice, double-pole fusing is seldom necessary. Double-pole switching, on the other hand, is almost always necessary in practice. The exception is where both the supply and the equipment connection to the supply are polarized, in which case a single- pole switch in the phase conductor is acceptable. Best regards, Rich --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Using PCB traces as transient voltage suppressor
And, to add to what Jim has said, I can only guess what would happen to sensitive, or not so sensitive, electronics, internal wiring or electromechanical parts when an open-air discharge occurs inside a product, especially a shielded product. Erratic behavior may be the lesser of what could happen. IMO, such electronics and/or parts might need to be really hardened against such an event, depending on the severity of the event. So, a few cents might have been saved on the spark gap, but. Comments? Best regards, Ron Pickard rpick...@hypercom.com jim.eich...@xantrex.com Sent by: To: emc-p...@majordomo.ieee.org owner-emc-pstc@majordomcc: o.ieee.org Subject: RE: Using PCB traces as transient voltage suppressor 02/20/02 02:10 PM Please respond to Jim.eichner Isn't the other issue here that creepage and clearance are normally required between live parts and from live parts to ground? If you buy components, you can go get approved components. If you do it yourself on the board, you're going to invoke all kinds of extra approvals work - evaluating your home-made spark gap to the standard for transient voltage suppressors, or your home made fuse to the standard for supplemental fuses, or... Regards, Jim Eichner, P.Eng. Manager, Engineering Services Xantrex Technology Inc. Mobile Power web: www.xantrex.com http://www.xantrex.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Rich Nute [mailto:ri...@sdd.hp.com] Sent: Wednesday, February 20, 2002 11:16 AM To: chris.maxw...@nettest.com Cc: gab...@simex.ca; emc-p...@majordomo.ieee.org Subject: Re: Using PCB traces as transient voltage suppressor Hi Chris: 1. Can anyone else verify the breakdown voltage of 1Megavolt/meter for air? Seems different than what I can remember; but I don't have a reference handy. It also seems to me that this would be very dependent upon humidity and pollution degree? In a separate message, I will send you the air breakdown voltage curves from IEC 664. Humid air has a very slightly higher electric strength than dry air. (Water vapor, a gas, has quite different properties than water as a liquid.) I believe air temperature has more effect on electric strength than does humidity. Pollution affects the electric strength of the scheme because it is deposited on the electrodes. This tends to reduce the electric strength between the two electrodes. This is a larger effect than humidity. The biggest factor affecting the electric strength of air is air pressure. Pollution, temperature, and humidity have relatively low effects. Best regards, Rich --- 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...@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://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
RE: Using PCB traces as transient voltage suppressor
Gabi, In my experience these crude spark gaps do work - for a while. The tips of the triangles tend to erode during surge testing, thereby raising the voltage required to jump the gap. I like the fact that you are only thinking of them as an addition rather than as primary protection. There are several drawbacks to be noted. 1) As already mentioned, the pads are fragile and erode with actual usage. 2) The discharge voltage is somewhat unpredictable and varies with dust, humidity, etc. 3) An audible snap is heard whenever a spark jumps across the gap. This may be unnerving to a customer who hears this. It may be perceived as a component failure. If cost allows I would recommend using a gas-filled discharge device instead. These are very predictable and repeatable, degrade much more slowly, and are much quieter. Scott Lacey -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Gabi Hoffknecht Sent: Wednesday, February 20, 2002 11:33 AM To: emc-p...@majordomo.ieee.org Subject: Using PCB traces as transient voltage suppressor Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- 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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: EN60950-1:2001
I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8 4BA2B6045BBF7E9A6A01F13E58@flbocexu05) about 'EN60950-1:2001', on Wed, 20 Feb 2002: Is EN 60950-1:2001 the same as EN 60950:2000 but renumbered, or were changes introduced? No, there are significant differences. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Safety of Indicating LEDs
I read in !emc-pstc that Scott Lemon sle...@caspiannetworks.com wrote (in 3c73e44e.a0d15...@caspiannetworks.com) about 'Safety of Indicating LEDs', on Wed, 20 Feb 2002: The scope of EN 60825-1 says LEDs are included whenever the word laser is used, meaning they are to be evaluated the same way lasers are. Does this apply to status indicating LEDs (non-lasing)? If so, are manufacturers expected to test every status-indicating LED on the product as if it were a laser? This is a very controversial matter, and the more surprising requirements are being toned down. Use the product safety standard (IECEN60065, 60950, etc.) to guide you. When googling, I came across a reference to a standard IEC/TS 60825-6, Safety of products with optical sources, exclusively used for visible information transmission to the human eye (1999-07). Is this the appropriate standard to use when evaluating status-indicating LEDs? It is very likely: from the title it could be little else. If so, how do the requirements/tests compare to that in 60825-1? I don't know. As far as I can tell, EN 60825-6 (if it exists) has not been published in the OJ and therefore cannot be used for presumption of compliance to the LVD. You don't need it, and an IEC TS is not likely to become and EN, but might become an ENV. What is the approach for indicating LEDs for EU compliance (CE marking)? Apply the relevant product safety standard. An IEC product safety WG concluded recently: From recent measurements it is clear that, by applying A.2 to the IEC 60825, remote controls are below class 1. This was confirmed by test results of NEMKO. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Use of PCB Traces as Fuse and Voltage suppressor
Hi Bogdan, I'm sorry if you thought that my previous message was an endorsement for using necked down PCB traces as a fuse. I understand and share the sentiment that it is an unpredictable and probably not even cost effective solution. I was wondering why anyone would shape a PCB trace in such a way (two triangles pointing at each other with a thin trace between the points). A fuse is probably not the likely intention. A reasonable explanation may be a cut jumper. The triangles make the trace visible; while the thin trace provides an easy spot for the trace to be cut with an exacto knife which permanently removes the jumper.Another reason (suggested by a colleage) are alignment marks used by the PCB fab house to help align layers. Just to be sure... I'm not suggesting the above as design ideas. I'm just trying to figure out why anyone would do such a thing. One solution to the original problem that I haven't seen suggested is the good old air discharge tube, gas-discharge tube, gas tube ...whatever you want to call them. Of course, they aren't free (about $1 each). They are more predictable than open air terminals, they are UL/CSA recognized and they can handle some massive breakdown currents. They are available from Bourns and Sankosha USA... probably some other manufacturers as well. Chris -Original Message- From: bogdan matoga [SMTP:bogda...@pacbell.net] Sent: Wednesday, February 20, 2002 4:19 PM To: gab...@simex.ca; Chris Maxwell; emc-p...@mahordomo.ieee.org Subject: Use of PCB Traces as Fuse and Voltage suppressor Gabi: I believe that there is a basic rule which is not published anywhere: when you design something, then do it right. When transient suppressors are needed, then use the correct component, which will not depend on Paschen's Law and give predictable performance. Same for necked down fuses. When you want performance, then do it right. The above original suggestions are perfect for Mickey-Mouse-engineering. Bogdan. --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Using PCB traces as transient voltage suppressor
Isn't the other issue here that creepage and clearance are normally required between live parts and from live parts to ground? If you buy components, you can go get approved components. If you do it yourself on the board, you're going to invoke all kinds of extra approvals work - evaluating your home-made spark gap to the standard for transient voltage suppressors, or your home made fuse to the standard for supplemental fuses, or... Regards, Jim Eichner, P.Eng. Manager, Engineering Services Xantrex Technology Inc. Mobile Power web: www.xantrex.com http://www.xantrex.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Rich Nute [mailto:ri...@sdd.hp.com] Sent: Wednesday, February 20, 2002 11:16 AM To: chris.maxw...@nettest.com Cc: gab...@simex.ca; emc-p...@majordomo.ieee.org Subject: Re: Using PCB traces as transient voltage suppressor Hi Chris: 1. Can anyone else verify the breakdown voltage of 1Megavolt/meter for air? Seems different than what I can remember; but I don't have a reference handy. It also seems to me that this would be very dependent upon humidity and pollution degree? In a separate message, I will send you the air breakdown voltage curves from IEC 664. Humid air has a very slightly higher electric strength than dry air. (Water vapor, a gas, has quite different properties than water as a liquid.) I believe air temperature has more effect on electric strength than does humidity. Pollution affects the electric strength of the scheme because it is deposited on the electrodes. This tends to reduce the electric strength between the two electrodes. This is a larger effect than humidity. The biggest factor affecting the electric strength of air is air pressure. Pollution, temperature, and humidity have relatively low effects. Best regards, Rich --- 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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: EN61000-6-2
Mike: My experience tells me that an attenuator designed for the same impedance as the transmission line, will **always** improve the VSWR at the source, irrespective of how bad or good the load VSWR is. (It is most helpful to think in terms of reflection coefficients rather than VSWR directly, to appreciate this.) Your comment implies otherwise, and I wonder if you could expand on what you've said - perhaps an example of where it doesn't help (not a given)? Regards, Jacob Z. Schanker, P.E. 65 Crandon Way Rochester, NY 14618 Phone: 585 442 3909 Fax: 585 442 2182 j.schan...@ieee.org - Original Message - From: Mike Hopkins mhopk...@thermokeytek.com To: 'Colgan, Chris' chris.col...@tagmclaren.com; EMC Forum emc-p...@ieee.org Sent: Wednesday, February 20, 2002 1:48 PM Subject: RE: EN61000-6-2 | | Seems an attenuator COULD improve matching and VSWR if it then became a | significant part of the load impedance; it isn't a given. On the other | hand, adding the attenuator should NOT cause the VSWR to become very high | unless it is not a 50 ohm attenuator.. | | Mike Hopkins | | -Original Message- | From: Colgan, Chris [mailto:chris.col...@tagmclaren.com] | Sent: Wednesday, February 20, 2002 4:26 AM | To: EMC Forum | Subject: RE: EN61000-6-2 | | | | In my experience attenuators improve impedance matching and hence VSWR. | There must be something wrong with your set up. | | Regards | | Chris Colgan | Compliance Engineer | TAG McLaren Audio Ltd | The Summit, Latham Road | Huntingdon, Cambs, PE29 6ZU | *Tel: +44 (0)1480 415 627 | *Fax: +44 (0)1480 52159 | * Mailto:chris.col...@tagmclaren.com | * http://www.tagmclaren.com | | | -Original Message- | From: Sam Wismer [SMTP:swis...@bellsouth.net] | Sent: 19 February 2002 16:52 | To: EMC Forum | Subject: EN61000-6-2 | | Hi Group, | | EN 61000-6-2 calls for severity level 3, or 10Vrms for conducted | disturbances. This equates to 37dBm which is 7dB higher than the upper | limit my receiver will handle (during calibration of the CDN). I've tried | to use an attenuator and compensate for it in my readings, but this | creates a high VSWR. Any ideas how to extend the dynamic range of my | receiver without causing high VSWR? | | | | | | Kind Regards, | | | | | | Sam Wismer | | Engineering Manager | | ACS, Inc. | | | | Phone: (770) 831-8048 | | Fax: (770) 831-8598 | | | | Web: www.acstestlab.com | | | | | | ** |Please visit us at www.tagmclaren.com | ** | | The contents of this E-mail are confidential and for the exclusive | use of the intended recipient. If you receive this E-mail in error, | please delete it from your system immediately and notify us either | by E-mail, telephone or fax. You should not copy, forward or | otherwise disclose the content of the E-mail. | | TAG McLaren Audio Ltd | The Summit, 11 Latham Road | Huntingdon, Cambs, PE29 6ZU | Telephone : 01480 415600 (+44 1480 415600) | Facsimile : 01480 52159 (+44 1480 52159) | | ** |Please visit us at www.tagmclaren.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...@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://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...@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://ieeepstc.mindcruiser.com/ | Click on browse and then emc-pstc mailing list | --- This message is from
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EN60950-1:2001
Is EN 60950-1:2001 the same as EN 60950:2000 but renumbered, or were changes introduced? Richard Woods Sensormatic Electronics Tyco International --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
[Fwd: Northeast Product Safety Society Meeting on Wednesday, February 27]
Forwarded for Matt Campanella Original Message Subject: Northeast Product Safety Society Meeting on Wednesday, February 27 List-Post: emc-pstc@listserv.ieee.org Date: Wed, 20 Feb 2002 19:14:16 + From: matt.campane...@att.net To: emc-p...@majordomo.ieee.org There will be a Northeast Product Safety Society meeting on Wednesday, February 27, at EMC Corporation's Customer Briefing Center in Hopkinton, MA. A social hour with light refreshments will begin at 7:00 PM and the technical meeting will start at 7:30 PM. Jon Curtis, Founder and Director of Engineering of Curtis-Straus LLC, will be presenting this month's technical topic concerning Laser Safety Issues in Optical Fiber Communication Systems. For further information about this meeting and Mr. Curtis, please see the NPSS website at http://www.nepss.org/call/next-mtgFeb27.html. The 2002 NPSS meeting schedule is available on the NPSS website at http://www.nepss.org/about/npss2002kf.html. The January President's message is now available on the NPSS website at http://www.nepss.org/messagepres_011802.htm. Further information about the Northeast Product Safety Society and how to become a member is available at http://www.nepss.org. You can also contact one of the NPSS officers via links at http://www.nepss.org/about/officerskf.html. Directions: From Route 495 North or South take exit 21B to South Street. At the first traffic light, turn left (Note: This is on South direction side of Route 495). EMC Corporation is the second driveway on the right. Matt Campanella NPSS Secretary Compliance Engineer Motorola, Inc. Broadband Communications Sector 3 Highwood Drive East Tewksbury, MA 01876 (978) 858-2303 Direct (978) 858-2300 Main (978) 858-2399 Fax --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Using PCB traces as transient voltage suppressor
Gabi, A couple of things for you to consider. You don't want to base your gap size on breakdown in air. You will need to account for the dielectric material of the PCB and possibly a conformal coating or solder mask on top of the etch. You need to decide whether or not you really want a discharge gap inside your unit possibly close to critical components. A breakdown inside your unit may be more trouble than the problem it solves. Bob Howland dBH Consulting -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Gabi Hoffknecht Sent: Wednesday, February 20, 2002 11:33 AM To: emc-p...@majordomo.ieee.org Subject: Using PCB traces as transient voltage suppressor Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- 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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Using PCB traces as transient voltage suppressor
Hi Chris: 1. Can anyone else verify the breakdown voltage of 1Megavolt/meter for air? Seems different than what I can remember; but I don't have a reference handy. It also seems to me that this would be very dependent upon humidity and pollution degree? In a separate message, I will send you the air breakdown voltage curves from IEC 664. Humid air has a very slightly higher electric strength than dry air. (Water vapor, a gas, has quite different properties than water as a liquid.) I believe air temperature has more effect on electric strength than does humidity. Pollution affects the electric strength of the scheme because it is deposited on the electrodes. This tends to reduce the electric strength between the two electrodes. This is a larger effect than humidity. The biggest factor affecting the electric strength of air is air pressure. Pollution, temperature, and humidity have relatively low effects. Best regards, Rich --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: South Korean Power System
To add a bit to Rich's comment. The Argentina and China (PRC) plugs have polarized plugs that are very similar to Australian style (without a caliper it is hard to tell the dimensonal differences). The PRC plugs are the same as the Australian polarization while the Argentina plugs are opposite of the Australian polarity. The polarity of these plugs may be marked on the plug face (Argentina is by requirement). Also, the Swiss and Israel 3-conductor plugs are configured so that polarization is possible but I have not confirmed whether this is done within the facility wiring. The Israel sample that I have has the polarity marked on the plug face but the Swiss one is not marked. Oscar Rich Nute ri...@sdd.hp.com@majordomo.ieee.org on 02/20/2002 12:38:19 PM Please respond to Rich Nute ri...@sdd.hp.com Sent by: owner-emc-p...@majordomo.ieee.org To: ed.pr...@cubic.com cc: emc-p...@majordomo.ieee.org (Product Safety Technical Committee) Subject: Re: South Korean Power System Hi Ed: With few exceptions, most power distribution systems have one pole of the supply, the neutral, grounded. (Indeed, the definition of neutral for single-phase systems is the grounded conductor.) In the IEC scheme of the world, a power distribution system where the neutral is grounded is known as a TN or TT system. The first letter identifies the grounding scheme for the neutral wire. The second letter identifies the grounding scheme for the protective wire. T = terra (a ground rod) N = neutral In North America, the scheme is TN. The neutral is connected to a ground rod at the service entrance. The protective wire is connected to the neutral in the breaker panel. I believe Korea uses the TN system. So, at any socket-outlet, one pin will be at the phase voltage, 220, and the other pin will be at the neutral voltage, 0. Polarity is a separate issue. By polarity, I mean that the neutral identification is maintained through the plug/socket-outlet scheme. Polarity is not maintained where the plug can be reversed in the socket-outlet. The SCHUKO plug is a plug that can be reversed in the socket outlet. Not only that, but the socket-outlet is symmetrical, so the wiring to the socket-outlet cannot be such that the neutral is always wired to the same pin. Among the world's plugs/socket-outlet combinations, relatively few maintain the polarity through the system. These are: the British 13-A plug/socket-outlet in UK, Ireland, Hong Kong, Singapore, etc. the old British 15-A plug/socket outlet in South Africa and India, etc. the Australian plug/socket-outlet the North American grounding plug/socket-outlet the North American two-wire plug/socket-outlet with one wide blade The French plug/socket-outlet with its grounding pin scheme COULD be polarized, but is not so wired. Likewise, the Danish, Chilean, and Chinese plug/socket-outlet could be polarized, but I cannot say if they are. Polarized plugs and socket-outlets always bear markings indicating the pole of each pin. For North American plugs and socket- outlets, the white or silver-colored screws or terminals are the neutral pins. Other plugs and socket-outlets bear molded in letters such as L, N, E or PE or G. Virtually all safety standards include the requirement that the neutral wire within the equipment shall be treated as if it was at mains voltage rather than at zero voltage. This is because, in many installations, errors may occur in the wiring of the socket- outlet. Best regards, Rich --- 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...@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://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...@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
RE: Using PCB traces as transient voltage suppressor
Gabi, The topic of an air-discharge spark gap is a little bit more complicated. 1) The breakdown voltage in air for a homogeneous field is given by the Paschen-equations, providing that the breakdown is a gas discharge process, not an explosive surface process (happens at high pressure, distances less than about 5um and if the gap is highly overvoltaged) Even for a homogenous field, the breakdown fieldstrength is a strong function of voltage. 2) A spark gap will need some time to turn on. There are two processes: Statistical time lag: this is the time it takes before the first electron appears that can start the avalange process. Time lags may be ps to seconds, depending on the field strength and many other factors. 3) Formative time: The time the spark needs from its start until its impedance is low. The time may be ns to us. 4) Clamping voltage. Typically spark gaps clamp at about 25 V for currents of less than 100 A in time frames of 10ns to a few hundred ns. I do not know the physical reason for the 25 V. If anyone knows, please let me know. 5) In my experience a PCB using the footprint of an 0805 part (not loaded) will break down at about 2000-3000V. 6) It is not easy to get breakdown voltages consistantly below 500 V with spark gap structures in air. The needed distances are so small that surface properties, contamination etc. start to dominate. Regards David Pommerenke Associate Professor Electromagnetic Compatibility Laboratory ECE Department University of Missouri-Rolla 1870 Miner Circle Rolla, MO 65409-0040 pommere...@ece.umr.edu Phone: (573) 341-4531 Home: (573) 341 5835 FAX: (573) 341-4532 -Original Message- From: Gabi Hoffknecht [mailto:gab...@simex.ca] Sent: Wednesday, February 20, 2002 10:33 AM To: emc-p...@majordomo.ieee.org Subject: Using PCB traces as transient voltage suppressor Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- 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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Using PCB traces as transient voltage suppressor
Just side comments to hopefully get discussion going... (See Gabi's email below) 1. Can anyone else verify the breakdown voltage of 1Megavolt/meter for air? Seems different than what I can remember; but I don't have a reference handy. It also seems to me that this would be very dependent upon humidity and pollution degree? 2. I'm assuming that 10mil means .010. I would think that such a small gap would be considered a potential problem in certain circuits. If this design were used in a hazardous circuit, wouldn't a safety test lab short out the gap just to see if a hazard develops? 3. I've seen this done before on circuitboards. The ones that I've seen actually had a thin neck of a trace connecting the points of the triangles. I always thought that this was done as sort of a cheap fuse. Is this true? My apologies to Gabi for not being able to answer his original question; but hopefully addressing my additional questions will get a more complete answer in the long run. 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 | Gabi's Original Email *** Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: EN61000-6-2
Seems an attenuator COULD improve matching and VSWR if it then became a significant part of the load impedance; it isn't a given. On the other hand, adding the attenuator should NOT cause the VSWR to become very high unless it is not a 50 ohm attenuator.. Mike Hopkins -Original Message- From: Colgan, Chris [mailto:chris.col...@tagmclaren.com] Sent: Wednesday, February 20, 2002 4:26 AM To: EMC Forum Subject: RE: EN61000-6-2 In my experience attenuators improve impedance matching and hence VSWR. There must be something wrong with your set up. Regards Chris Colgan Compliance Engineer TAG McLaren Audio Ltd The Summit, Latham Road Huntingdon, Cambs, PE29 6ZU *Tel: +44 (0)1480 415 627 *Fax: +44 (0)1480 52159 * Mailto:chris.col...@tagmclaren.com * http://www.tagmclaren.com -Original Message- From: Sam Wismer [SMTP:swis...@bellsouth.net] Sent: 19 February 2002 16:52 To: EMC Forum Subject: EN61000-6-2 Hi Group, EN 61000-6-2 calls for severity level 3, or 10Vrms for conducted disturbances. This equates to 37dBm which is 7dB higher than the upper limit my receiver will handle (during calibration of the CDN). I've tried to use an attenuator and compensate for it in my readings, but this creates a high VSWR. Any ideas how to extend the dynamic range of my receiver without causing high VSWR? Kind Regards, Sam Wismer Engineering Manager ACS, Inc. Phone: (770) 831-8048 Fax: (770) 831-8598 Web: www.acstestlab.com ** Please visit us at www.tagmclaren.com ** The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. TAG McLaren Audio Ltd The Summit, 11 Latham Road Huntingdon, Cambs, PE29 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) ** Please visit us at www.tagmclaren.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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Using PCB traces as transient voltage suppressor
I designed those in the late 70's in PCB's while at Experimental Physics Corp. They have been used with various degrees of success (depends on your expectations!) The major problem is the lack of predictability of the switch voltage. Many factors such as exact radius of the tip, solder mask and type or avoidance of, etc. But, they do work if you do not expect a narrow range of switch V threshold. For basic OV protection with additional better OV networks downstream, they work fine. --- Gabi Hoffknecht gab...@simex.ca wrote: Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Safety of Indicating LEDs
Hi Scott: The scope of EN 60825-1 says LEDs are included whenever the word laser is used, meaning they are to be evaluated the same way lasers are. Does this apply to status indicating LEDs (non-lasing)? If so, are manufacturers expected to test every status-indicating LED on the product as if it were a laser? Yes. At least one certification house demands measurement data for each indicator LED. Emission class must be identified on the product or in the manual. (Note that emission class is determined under single-fault conditions in the driving circuit.) However, in practice, other certification houses use a get-out for indicator LEDs. Usually this is in the form of a not tested, but may be required by some authorities statement in the report. Most indicator LED manufacturers do not know of EN 60825-1, and have no idea how to test. Measurement is not easy, especially the determination of the aperture. Most indicator LEDs will open before achieving Class 2 emission levels. The above does not apply to automotive LEDs or to traffic signal LEDs. Best regards, Rich --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: South Korean Power System
I read in !emc-pstc that Crabb, John jo...@exchange.scotland.ncr.com wrote (in B6CD5947CF30D411A1350050DA4B75FF03C2341C@sgbdun200.scotland.n cr.com) about 'South Korean Power System', on Wed, 20 Feb 2002: Typically I would expect IT equipment to be safe if line and neutral were reversed, except for the issues relating to a single pole disconnect device and fusing. See Tables 2E and 2F in IEC/EN60950:2000. Double-pole switching and fusing is almost always necessary in practice. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Safety of Indicating LEDs
Hello Group, The scope of EN 60825-1 says LEDs are included whenever the word laser is used, meaning they are to be evaluated the same way lasers are. Does this apply to status indicating LEDs (non-lasing)? If so, are manufacturers expected to test every status-indicating LED on the product as if it were a laser? When googling, I came across a reference to a standard IEC/TS 60825-6, Safety of products with optical sources, exclusively used for visible information transmission to the human eye (1999-07). Is this the appropriate standard to use when evaluating status-indicating LEDs? If so, how do the requirements/tests compare to that in 60825-1? As far as I can tell, EN 60825-6 (if it exists) has not been published in the OJ and therefore cannot be used for presumption of compliance to the LVD. What is the approach for indicating LEDs for EU compliance (CE marking)? Thanks in advance! -- Regards, Scott Lemon CASPIAN NETWORKS sle...@caspiannetworks.com www.caspiannetworks.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: International Power Requirements
Here is another one: http://www.kropla.com/electric2.htm Ed From: oover...@lexmark.com Reply-To: oover...@lexmark.com To: emc-p...@majordomo.ieee.org Subject: International Power Requirements Date: Wed, 20 Feb 2002 11:23:02 -0500 Check out this website for power requirements, plug styles, and languages. Look under South Korea for Korea. ftp://ftp.lexmark.com/pub/networking/internat.htm --- 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...@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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" Chat with friends online, try MSN Messenger: Click Here --- 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...@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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: South Korean Power System
Hi Ed: With few exceptions, most power distribution systems have one pole of the supply, the neutral, grounded. (Indeed, the definition of neutral for single-phase systems is the grounded conductor.) In the IEC scheme of the world, a power distribution system where the neutral is grounded is known as a TN or TT system. The first letter identifies the grounding scheme for the neutral wire. The second letter identifies the grounding scheme for the protective wire. T = terra (a ground rod) N = neutral In North America, the scheme is TN. The neutral is connected to a ground rod at the service entrance. The protective wire is connected to the neutral in the breaker panel. I believe Korea uses the TN system. So, at any socket-outlet, one pin will be at the phase voltage, 220, and the other pin will be at the neutral voltage, 0. Polarity is a separate issue. By polarity, I mean that the neutral identification is maintained through the plug/socket-outlet scheme. Polarity is not maintained where the plug can be reversed in the socket-outlet. The SCHUKO plug is a plug that can be reversed in the socket outlet. Not only that, but the socket-outlet is symmetrical, so the wiring to the socket-outlet cannot be such that the neutral is always wired to the same pin. Among the world's plugs/socket-outlet combinations, relatively few maintain the polarity through the system. These are: the British 13-A plug/socket-outlet in UK, Ireland, Hong Kong, Singapore, etc. the old British 15-A plug/socket outlet in South Africa and India, etc. the Australian plug/socket-outlet the North American grounding plug/socket-outlet the North American two-wire plug/socket-outlet with one wide blade The French plug/socket-outlet with its grounding pin scheme COULD be polarized, but is not so wired. Likewise, the Danish, Chilean, and Chinese plug/socket-outlet could be polarized, but I cannot say if they are. Polarized plugs and socket-outlets always bear markings indicating the pole of each pin. For North American plugs and socket- outlets, the white or silver-colored screws or terminals are the neutral pins. Other plugs and socket-outlets bear molded in letters such as L, N, E or PE or G. Virtually all safety standards include the requirement that the neutral wire within the equipment shall be treated as if it was at mains voltage rather than at zero voltage. This is because, in many installations, errors may occur in the wiring of the socket- outlet. Best regards, Rich --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
The attached GIF image shows frequency allocation in Japan. Regards, +=+ |Ronald R. Wellman|Voice : 408-345-8229 | |Agilent Technologies |FAX : 408-553-2412 | |5301 Stevens Creek Blvd.,|E-Mail: ron_well...@agilent.com| |Mailstop 54L-BB |WWW : http://www.agilent.com http://www.agilent.com/ | |Santa Clara, California 95052 USA| | +=+ | Common sense is the collection of prejudices acquired by age | | eighteen. - Albert Einstein | +=+ -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: Wednesday, February 20, 2002 4:46 AM To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com attachment: pwr-f.gif
RE: Japan mains voltage
The Guide to Worldwide Plug/Socket Patterns and Power Mains (Single Phase) reports Japan as 100V, 50/60 Hz. See: http://www.panelcomponents.com/guide.htm Brian Epstein Sr Regulatory Compliance Engineer Veeco Metrology 112 Robin Hill Rd Santa Barbara, CA 93117 brian.epst...@veeco.com -Original Message- From: Darren Pearson To: emc-p...@ieee.org Sent: 2/20/2002 4:46 AM Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Bellcore Redundancy Requirements?
Can help you on question 2) The L10 figure is indeed often used by fan manufacturers and does specify the statistical time after which 10% of the fans will have failed. It is an expression for components whose failure rate is dependant on time of service, i.e. they have a non constant failure rate. MTBF figures are only appropriate for components that have a constant, time independent failure rate. To calculate and predict time dependant failure rates, you need to use a Weibull equation and require the correct shape and scale parameters for the component in question. Getting these out of manufacturers can be difficult. But with on of the three, shape, scale or L10, you can calculate the others. For question 1) Covering redundancy and equipment availability in a complex system, a SEMI standard E10-0701 has been issued to cover this. However I am still waiting for my copy to arrive so have not been able to read it yet. Andrew Carson - Senior Compliance Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 -Original Message- From: Gary McInturff [mailto:gary.mcintu...@worldwidepackets.com] Sent: 19 February 2002 15:52 To: kazimier_gawrzy...@dell.com; emc-p...@ieee.org Subject: RE: Bellcore Redundancy Requirements? I'd be interested as well, for two reasons. 1) I think the requirement is a bit out of date, and really only discusses bringing in two DC power feeds, A and B. That however seems more adapted to the days of simpler systems that would take the power through some steering diodes and take it straight to a back plane and power all of the cards in the box. As things have become more complex systems inject system power supplies (DC-DC for example) into the network but the standards don't seem to address the need for redundancy at this point. Unfortunately, I don't have the document in my hands, it was a question that came up during some recent testing. 2) Isn't L-10 a fan type of specification. The point at which 10% of the fans fail. I have been chasing this question on and off for awhile. Thanks Gary -Original Message- From: kazimier_gawrzy...@dell.com [mailto:kazimier_gawrzy...@dell.com] Sent: Saturday, February 16, 2002 7:25 AM To: emc-p...@ieee.org Subject: RE: Bellcore Redundancy Requirements? Hello All, If any members of this forum have any response copies that were sent out to John's question below, would you please forward a copy to me? Thanks In Advance, Kaz Gawrzyjal kazimier_gawrzy...@dell.com -Original Message- From: Kretsch, John [mailto:john_kret...@adc.com] Sent: Wednesday, February 14, 2001 12:37 PM To: 'emc-p...@ieee.org' Subject: Bellcore Redundancy Requirements? Does anyone in the collective know about _where_ Bellcore spells out any sort of redundancy requirements. There is a buzz about L-10 requirements and I'm not sure where this comes from. TIA. Regards, John Kretsch --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- 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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Japan mains voltage
Darren, The information that I have seen from the two sources listed below is that Japan is nominally 100V 50/60 Hz. The 50 Hz is primarily in Eastern Japan (Tokyo, Kawasaki, Sapporo and Yokohoma). The 60 Hz is primarily in Western Japan (Osaka, Kyoto, Nagoya and Hiroshima). Check out the two web sites below. They both contain lists for voltages and frequencies for around the world. http://www.interpower.com/guide.htm http://kropla.com/electric2.htm Regards Joe Martin EMC/Product Safety Engineer Applied Biosystems Darren Pearson dar...@genesysibs.comTo: emc-p...@ieee.org Sent by: cc: owner-emc-pstc@majordomSubject: Japan mains voltage o.ieee.org 02/20/02 04:46 AM Please respond to Darren Pearson Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com web: www.genesysibs.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: South Korean Power System
Since the Japanese use the North American style plug (seems an odd choice since it is so flimsy in comparison to other types they could have used), it's probably a good bet that the Koreans us this as well. I'd be surprised if they used the Schuko plug. Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: February 20, 2002 12:21 AM To: emc-p...@majordomo.ieee.org Subject: Re: South Korean Power System I read in !emc-pstc that Price, Ed ed.pr...@cubic.com wrote (in b78135310217d511907c0090273f5190d0b...@curly.ds.cubic.com) about 'South Korean Power System', on Tue, 19 Feb 2002: Are both wires floating off of ground? Or is one of the power conductor wires tied to safety ground? And, if one conductor is grounded, as you face into a socket, is it the left or right contact? If the 3-contact connector really is a Schuko, the plug can be inserted either way round, so you have to treat both power contacts as live. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Japan mains frequency
A good source is http://kropla.com/electric2.htm http://kropla.com/electric2.htm . According to that site: Japan100V50/60 Hz* *Eastern Japan 50 Hz (Tokyo, Kawasaki, Sapporo, Yokohoma, and Sendai) *Western Japan 60 Hz (Osaka, Kyoto, Nagoya, Hiroshima) According to a history told to me by a GE old-timer... Japan has two frequencies because, in the early days of electric power in Japan, Western Japan bought its first generator from General Electric (60 Hz), and Eastern Japan bought its first generator from Russia (50 Hz). So, this is an easy way to remember what part of the country is 60 Hz and what part is 50 Hz: The western part is closest to North America (60 Hz), and the eastern part is closest to Russia (50 Hz). (However, the cities listed above seem to be in the opposite parts of Japan than as listed.) Best regards, Rich --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
One of the Japanese islands also has a 50Hz power grid. Apparently it's a real dog's breakfast there, as far as AC power systems are concerned. The voltage is 100 V, not 110V (as the original poster had mentioned). Bob Wilson TIR Systems Ltd. Vancouver.
RE: South Korean Power System
IEC60950 has a requirement (1.6.4) that the neutral conductor, if any, shall be insulated from earth and from the BODY throughout the equipment as if it were a line conductor. Components connected between neutral and earth shall be rated for the line-to-neutral voltage. Typically I would expect IT equipment to be safe if line and neutral were reversed, except for the issues relating to a single pole disconnect device and fusing. Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Discovery Centre, 3 Fulton Road, Dundee, Scotland, DD2 4SW E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. -Original Message- From: Price, Ed [mailto:ed.pr...@cubic.com] Sent: 20 February 2002 16:09 To: 'EMC-PSTC List' Subject: RE: South Korean Power System Hi Listmembers! I asked a general question yesterday about Korean AC power, but now I have a little better idea about what I need to discover. One of our field engineers said that AC power at South Korean military bases used the SCHUKO style outlet system. But he said that one of the power pins was somehow referenced to the safety ground. Thus, one pin to safety ground was 220 V, the other pin to safety ground was 0 V. Can anyone confirm this? And if so, which pin is the hot pin? John Woodgate pointed out that SCHUKO plugs are symmetrical, and can be plugged in two ways. That seems to imply that even if one pin is referenced to safety ground, the appliance manufacturer must design his device to accept the plug connected either way. I think that means the appliance manufacturer must then design for the possibility that either input powerline might be hot. Comments? Thanks again, Ed -Original Message- From: Price, Ed Sent: Tuesday, February 19, 2002 4:12 PM To: 'EMC-PSTC List' Subject: South Korean Power System Hi Listmembers: Can anyone tell me which is the correct electrical wiring commonly used for South Korea? I understand that the power is 60 Hz, 220 Vrms. I believe that two types of outlets are common there. First is a two round pin, round connector. This does not have a safety ground connection. Second is a SCHUKO type outlet, with two round pins and two safety ground tabs. (A 2-pin plug, without a safety ground, can also plug into this outlet.) Are both wires floating off of ground? Or is one of the power conductor wires tied to safety ground? And, if one conductor is grounded, as you face into a socket, is it the left or right contact? Thanks, 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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
The standard voltages are 100 V (the standard outlet) and 200 V, and one half of the country uses 50 Hz while the other half uses 60 Hz. The division is North and South, but I don't recall which half uses 50 Hz. Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: Wednesday, February 20, 2002 7:46 AM To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com
Using PCB traces as transient voltage suppressor
Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
International Power Requirements
Check out this website for power requirements, plug styles, and languages. Look under South Korea for Korea. ftp://ftp.lexmark.com/pub/networking/internat.htm --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
Much of Japan is 100V 50Hz (worst case for transformers). Japan approval should cover 50/60Hz. Hotels generate a 120V 60Hz for US appliances. The 200V supply is more complicated. I had a JEOL electron microscope that wanted 3-phase 200 volts. They would not let us run it on 208V 3-phase and we had to install an elaborate conversion network. David -Original Message- From: Crabb, John [mailto:jo...@exchange.scotland.ncr.com] Sent: Wednesday, February 20, 2002 8:33 AM To: emc-p...@ieee.org Subject: RE: Japan mains voltage According to World Electricity Supplies from BSI, voltage is 200/100, 60 Hz. We have certainly produced 100V 60 Hz specials for Japan. Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Discovery Centre, 3 Fulton Road, Dundee, Scotland, DD2 4SW E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus 6-341-2289. -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: 20 February 2002 12:46 To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com
RE: Japan mains voltage
Darren - the Japan mains voltage in the range you request is 100V. As I understand it, though this is open to correction, Japan has both 50Hz and 60Hz distribution systems, depending upon where you are located, even on the large island. I do note, however, that the US Dept. of Commerce's publication, Electric Current Abroad, indicates only 50Hz. I have other sources that indicate both 50Hz and 60Hz. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services peter.tar...@sanmina-sci.com -Original Message- From: Darren Pearson Sent: Wednesday, February 20, 2002 4:46 AM Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com web: www.genesysibs.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: South Korean Power System
Hi Listmembers! I asked a general question yesterday about Korean AC power, but now I have a little better idea about what I need to discover. One of our field engineers said that AC power at South Korean military bases used the SCHUKO style outlet system. But he said that one of the power pins was somehow referenced to the safety ground. Thus, one pin to safety ground was 220 V, the other pin to safety ground was 0 V. Can anyone confirm this? And if so, which pin is the hot pin? John Woodgate pointed out that SCHUKO plugs are symmetrical, and can be plugged in two ways. That seems to imply that even if one pin is referenced to safety ground, the appliance manufacturer must design his device to accept the plug connected either way. I think that means the appliance manufacturer must then design for the possibility that either input powerline might be hot. Comments? Thanks again, Ed -Original Message- From: Price, Ed Sent: Tuesday, February 19, 2002 4:12 PM To: 'EMC-PSTC List' Subject: South Korean Power System Hi Listmembers: Can anyone tell me which is the correct electrical wiring commonly used for South Korea? I understand that the power is 60 Hz, 220 Vrms. I believe that two types of outlets are common there. First is a two round pin, round connector. This does not have a safety ground connection. Second is a SCHUKO type outlet, with two round pins and two safety ground tabs. (A 2-pin plug, without a safety ground, can also plug into this outlet.) Are both wires floating off of ground? Or is one of the power conductor wires tied to safety ground? And, if one conductor is grounded, as you face into a socket, is it the left or right contact? Thanks, 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
Japan Mains Voltage is 100V. The north half of the country is 50 Hz and the South Half is 60 Hz. Or is it vice-versa... -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: Wednesday, February 20, 2002 4:46 AM To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com
Re: Japan mains voltage
On Wed, 20 Feb 2002 12:46:19 -, Darren Pearson dar...@genesysibs.com wrote: Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. The nominal voltage is 100V, and the frequency can 50Hz or 60Hz depends to the area. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Some URLs are listed in the section 2.2 of the s.e.e.c FAQ, at http://users.metro2000.net/~purwinc/compliance_faq.html Regards, Tom -- Tomonori Sato vef00...@nifty.ne.jp URL: http://member.nifty.ne.jp/tsato/ xvkbd-2.1 (virtual keyboard for X) available --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
FW: Japan mains voltage
-Original Message- From: Spicer, Keith Sent: 20 February 2002 15:47 To: 'Darren Pearson' Subject: RE: Japan mains voltage Try the following urls for information about the mains voltage and frequency of various countries http://www.kropla.com/electric2.htm http://www.kropla.com/electric2.htm http://www.panelcomponents.com/guide.htm http://www.panelcomponents.com/guide.htm Regards keith -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: 20 February 2002 12:46 To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
A good source is http://kropla.com/electric2.htm http://kropla.com/electric2.htm . According to that site: Japan100V50/60 Hz* A, B http://kropla.com/!ab.htm *Eastern Japan 50 Hz (Tokyo, Kawasaki, Sapporo, Yokohoma, and Sendai); Western Japan 60 Hz (Osaka, Kyoto, Nagoya, Hiroshima The plugs (A, B) are shown on http://kropla.com/!ab.htm http://kropla.com/!ab.htm . Regards, Naftali Shani, Catena Networks (www.catena.com) 307 Legget Drive, Kanata, Ontario, Canada K2K 3C8 613.599.6430/866.2CATENA (X.8277); C 295.7042; F 599.0445 E-mail: nsh...@catena.com -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: Wednesday, February 20, 2002 7:46 AM To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com
RE: Japan mains voltage
The table on this page is a pretty good reference: http://www.voltageconverters.com/voltageguide.htm http://www.voltageconverters.com/voltageguide.htm Paul Hare e: ph...@pirus.com Compliance Engineer w: 978.206.9179 Pirus Networks f: 978.206.9199 43 Nagog Park c: 508.450.0376 Acton, MA 01720 i: www.pirus.com -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: Wednesday, February 20, 2002 7:46 AM To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com
Re: Japan mains voltage
Darren, The mains voltage in Japan is 100V +/- 10%. Half of Japan is supplied from a 50Hz system and another half is supplied from a 60Hz system. John Radomski Clare Darren Pearson dar...@genesysibs.com To: emc-p...@ieee.org Sent by: cc: owner-emc-pstc@majordom Subject: Japan mains voltage o.ieee.org 02/20/02 07:46 AM Please respond to Darren Pearson Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com web: www.genesysibs.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Japan mains voltage
I read in !emc-pstc that Darren Pearson dar...@genesysibs.com wrote (in 001a01c1ba0c$c7243fa0$0a00a8c0@darrendesktop) about 'Japan mains voltage', on Wed, 20 Feb 2002: Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. It's 100 V, and half the country has 50 Hz and half has 60 Hz. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Japan mains voltage
According to World Electricity Supplies from BSI, voltage is 200/100, 60 Hz. We have certainly produced 100V 60 Hz specials for Japan. Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Discovery Centre, 3 Fulton Road, Dundee, Scotland, DD2 4SW E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus 6-341-2289. -Original Message- From: Darren Pearson [mailto:dar...@genesysibs.com] Sent: 20 February 2002 12:46 To: emc-p...@ieee.org Subject: Japan mains voltage Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com mailto:dar...@genesysibs.com web: www.genesysibs.com http://www.genesysibs.com
Japan mains voltage
Can anyone tell me what the mains voltage is in Japan, I think it is 110V but I do not know the frequency. apart from this, does any one know of a web site that gives information about the mains voltage and frequency of various countries ? Regards Darren. Darren Pearson Radio Telecom Approval Services Genesys Singleton Court, Wonastow Road Monmouth, NP25 5JA UK Tel: +44 1600 710300 Fax: +44 1600 710301 email: dar...@genesysibs.com web: www.genesysibs.com
China- Radio Standard
Hi, I'm looking for an English version of china radio standard AD/T 1158-2001. Any information will be very welcome. --- 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: EN61000-6-2
Hi, When I set the Conducted immunity test up for folks I ALWAYS add an attenuator on the front end of the spectrum analyser. Typically I use a 25 watt 10 dB pad followed by a 20 dB 1 watt pad. I use a good quality attenuator, and if accuracy is really critical, I characterise them and compensate in the software. What I've seen is that setup using automated software, poorly tuned, work the signal source very hard. After a time this chap begins to put out transients that are faithfully amplified and end up at the front end of the SA. SA's seem to handle 30 dBm, just, but anything, even for the shortest time, over that and the front end goes. I've found that you should also include the 6 dB pad at the input of your coupling device. Apart from the Standard requiring it, it really does help. Also, don't rule out a degrading cable as the source of your problem Best regards, Derek Walton Schaffner USA RF Systems Specialist.
RE: EN61000-6-2
In my experience attenuators improve impedance matching and hence VSWR. There must be something wrong with your set up. Regards Chris Colgan Compliance Engineer TAG McLaren Audio Ltd The Summit, Latham Road Huntingdon, Cambs, PE29 6ZU *Tel: +44 (0)1480 415 627 *Fax: +44 (0)1480 52159 * Mailto:chris.col...@tagmclaren.com * http://www.tagmclaren.com -Original Message- From: Sam Wismer [SMTP:swis...@bellsouth.net] Sent: 19 February 2002 16:52 To: EMC Forum Subject: EN61000-6-2 Hi Group, EN 61000-6-2 calls for severity level 3, or 10Vrms for conducted disturbances. This equates to 37dBm which is 7dB higher than the upper limit my receiver will handle (during calibration of the CDN). I've tried to use an attenuator and compensate for it in my readings, but this creates a high VSWR. Any ideas how to extend the dynamic range of my receiver without causing high VSWR? Kind Regards, Sam Wismer Engineering Manager ACS, Inc. Phone: (770) 831-8048 Fax: (770) 831-8598 Web: www.acstestlab.com ** Please visit us at www.tagmclaren.com ** The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. TAG McLaren Audio Ltd The Summit, 11 Latham Road Huntingdon, Cambs, PE29 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) ** Please visit us at www.tagmclaren.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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
SV: Industrial Locations
Jim, You are correct, CISPR 11 refer to class A/B and the mains power distribution system. When I quoted the locations from EN50081-2 (emission), I forgot a footnote so let me correct it: - industrial, scientific and medical apparatus (ISM) (footnote 1) are present (footnote 1): As defined in EN55011, ISM class A. The same footnote is present in EN50082-2. Amund -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av Jim Conrad Sendt: 20. februar 2002 03:21 Til: am...@westin-emission.no; emc-p...@majordomo.ieee.org Emne: RE: Industrial Locations Amund, I am curious why you included ISM in your list of industrial locations. ISM can be either class A or class B. I thought the distinction was made according to the mains power distribution system; CISPR 11, subclause 4.2. JIm -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of am...@westin-emission.no Sent: Tuesday, February 19, 2002 2:23 PM To: emc-p...@majordomo.ieee.org Subject: SV: Industrial Locations I only have the generic EN50082-2 (immunity) and EN50081-2 (emission) standards, so I quote the description of locations from these standards: QUOTE start Industrial locations are characterized by the existence of one or more of the following conditions: - industrial, scientific and medical apparatus are present - heavy inductive or capacitive loads are frequently switched - current and associated field are high These are the major contributors to the industrial electromagnetic environment and as such distinguish the industrial from other environments. QUOTE end There are no other industrial examples in these generic standards. Amund, Oslo/Norway -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av richwo...@tycoint.com Sendt: 19. februar 2002 15:45 Til: emc-p...@majordomo.ieee.org Emne: Industrial Locations Do the Generic emission and immunity ENs for industrial locations provide examples of those locations? If so, I would appreciate someone providing the list of the example locations. I need to compare them against the examples of light-industrial locations. Thanks in advance. Richard Woods Sensormatic Electronics Tyco International --- 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...@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://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...@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://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...@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://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
RE: Industrial Locations
Amund, I am curious why you included ISM in your list of industrial locations. ISM can be either class A or class B. I thought the distinction was made according to the mains power distribution system; CISPR 11, subclause 4.2. JIm -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of am...@westin-emission.no Sent: Tuesday, February 19, 2002 2:23 PM To: emc-p...@majordomo.ieee.org Subject: SV: Industrial Locations I only have the generic EN50082-2 (immunity) and EN50081-2 (emission) standards, so I quote the description of locations from these standards: QUOTE start Industrial locations are characterized by the existence of one or more of the following conditions: - industrial, scientific and medical apparatus are present - heavy inductive or capacitive loads are frequently switched - current and associated field are high These are the major contributors to the industrial electromagnetic environment and as such distinguish the industrial from other environments. QUOTE end There are no other industrial examples in these generic standards. Amund, Oslo/Norway -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av richwo...@tycoint.com Sendt: 19. februar 2002 15:45 Til: emc-p...@majordomo.ieee.org Emne: Industrial Locations Do the Generic emission and immunity ENs for industrial locations provide examples of those locations? If so, I would appreciate someone providing the list of the example locations. I need to compare them against the examples of light-industrial locations. Thanks in advance. Richard Woods Sensormatic Electronics Tyco International --- 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...@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://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...@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://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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
South Korean Power System
Hi Listmembers: Can anyone tell me which is the correct electrical wiring commonly used for South Korea? I understand that the power is 60 Hz, 220 Vrms. I believe that two types of outlets are common there. First is a two round pin, round connector. This does not have a safety ground connection. Second is a SCHUKO type outlet, with two round pins and two safety ground tabs. (A 2-pin plug, without a safety ground, can also plug into this outlet.) Are both wires floating off of ground? Or is one of the power conductor wires tied to safety ground? And, if one conductor is grounded, as you face into a socket, is it the left or right contact? Thanks, 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: GSM EMC Test Specification
In Europe we use a ETSI standars for this EN 301 489-1 and EN 301 489-7 TRy on http://ww.etsi.org are free Ciao Paolo At 08:09 2/19/02 +0900, Jong Ho,Lee wrote: Hi Folk I want to know EMC standards and Test specifications of GSM as follow. ¡á GSM phone ¡á GSM accessory (i.e. Adaptor,Ear phone) If you kow about that,Please let me know. Best regards James. -- Paolo Gemma Siemens Information and Communication Network spa Microwave Networks MW RD NSA EMC SS Padana sup. KM 158 20060 Cassina de'Pecchi (MI) Italy phone +39 02 9526 6587fax +39 02 9526 6203 mobile +39 348 3690185 e-mail paolo.ge...@icn.siemens.it --
Re: Chamber Doors
I read in !emc-pstc that Patrick Lawler plaw...@west.net wrote (in t6157u4ruiugh8ji8e8em5oc6adebrl...@4ax.com) about 'Chamber Doors', on Tue, 19 Feb 2002: Are you sure? Berylium Oxide (BeO) has a long-standing reputation for being toxic, but I've never heard of metalic berylium (Be) posing a problem. The metal is very reactive and oxidizes in air. But, AFAIK, the oxide forms a very thin layer on the surface, as is the case for aluminium, so the amount of oxide produced from CuBe250 (the 'cooking' grade of beryllium copper, AIUI, with 2.5% Be) is very small indeed in normal use. Machining it is a different matter. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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...@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://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
