dielectric constant of foam board
Anybody have a dielectric constant for Owens Corning Foamular board? It's a pink, medium density extruded polystyrene foam found at most building supply places. I'm guessing 1.1-1.2, but that's just a guess. TIA, Brent 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: Conducted emissions--green wire?
I don't think I'd go back to that test house! What the technician did was both wrong and potentially dangerous. The closest test method to this that I know of was under the old VDE 0871 regulation in which a 50 ohm-50 microhenry network was inserted into the protective earth to lift the lead at conducted emissions frequencies. Regards, Brent DeWitt Boris Yost yost@rainbowdisplays.c To: Emc-Pstc@Majordomo. Ieee. Org emc-p...@majordomo.ieee.org om cc: Sent by: Subject: Conducted emissions--green wire? owner-emc-pstc@majordom o.ieee.org 14-07-03 11:02 AM Please respond to Boris Yost Dear Listers: I recently watched a conducted emissions test. Said test technician connected Line to a LISN, Neutral to a LISN, and ground got stuck in a piece of foam to keep it from touching anything. This bothered me and I questioned this. However, according to said test technician, that is what they are supposed to do. The LISN's and the EUT were put on a metal table surface. The LISN's were well strapped down, but my thing was just sitting there. Doesn't this mean that the impedance of the EUT is some random number depending on the materials and surface finishes of the table, EUT, and where they put the LISN's? The stand I used for the EUT isn't really part of the EUT, just something I had to hold it up. What happens when somebody else mounts a display on a furniture lift and puts it in a piece of wooden furniture? Boris 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: Monitoring Random ESD events
If you can get near the sensors (1 inch), 3M makes a static field meter. Their Model 718 is a non-contact device and has an analog output proportional to the field for logging. Best of luck, Brent DeWitt Eric Penne epe...@ieee.org To: emc-p...@majordomo.ieee.org Sent by: cc: owner-emc-pstc@majordom Subject: Monitoring Random ESD events o.ieee.org 08-07-03 02:38 PM Please respond to Eric Penne I'm pretty new to the EMC scene and I need to monitor a product to see what kind of ESD events it generates on its own. The customer wants me to attach my oscope to their sensors and see what kind of ESD voltages their sensors see in daily operation. I know that I don't want to directly connect the oscope to the sensors while the machine is running. I was trying to figure out a way to isolate the signals on the sensors from the oscope but still get a value that is useful. I was thinking of some sort of current loop around the sensor wires. How would I correlate the current loop measurement to an ESD voltage? I'm probably not providing enough information but I'm not really sure what information will be needed. Thank you, Eric Penne epe...@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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Czech medical grounding?
I got some weird feedback from one of our sales people in the Czech republic. One of the local folks said they were concerned that a metal cased piece of medical electrical equipment didn't have a separate ground for when it was used on internal batteries. I'm an EMC guy so I was wondering if any of the safety experts out there could tell me if this makes any sense from a regulatory standpoint. Thanks! Brent DeWitt 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: another OATS question
Hi Ken, Only the maximum reading over the scan height is used. The received signal is nominally the vector sum of the line of sight path and the reflected or image path from the ground plane. In horizontal polarization there is also 180 degree phase shift due to conservation of charge physics with the ground plane. Best regards, Brent DeWitt 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: About Radiated Measurements
Muriel, I would suggest leaving them inside connected by a length of wire that is somewhat representative of the size of the final application. Best yet, do it both ways and see if it makes a diference. Regards, Brent DeWitt Muriel Bittencourt de Liz mur...@eel.ufsc.br@majordomo.ieee.org on 20-02-2003 12:21:38 PM Please respond to Muriel Bittencourt de Liz mur...@eel.ufsc.br Sent by: owner-emc-p...@majordomo.ieee.org To: EMC-PSTC List emc-p...@ieee.org cc: Subject: About Radiated Measurements Group, I have a doubt concerning radiated emissions measurement: - For radiated emissions measurement of switched mode power supplies using a TEM cell, should I leave the loads of the supply inside or outside the cell?? My TEM cell have filtered connections for DC loads. Thanks in advance for your help. Best Regards, Muriel This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
MRI compatible?
Where can one find the regulations and testing requirements to declare a device MRI compatible? Thanks, Brent DeWitt Datex-Ohmeda Louisville, CO This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Tektronix AM503 question
Does anyone out there have a service manual for a Tektronix AM503A current probe amplifier? I need to know what error code 50 followed by LO followed by 81 means. Thanks in advance, Brent DeWitt This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: EN 60601-1-2/ EN 55022: 1998
David, EN 60601-1-2:2001 (i.e. IEC 60601-1-2) was published in the Official Journal Dec 13, 2002 with reference to the MDD, i.e. it is now officially harmonized. The date of cessation of presumption of conformity by applying the superseded standard EN 60601-1-2:1993 has been set to 2004-11-01 (Nov. 1, 2004). Regards, Brent DeWitt Datex-Ohmeda Louisville, CO ITL-EMC User Group itl-...@itl.co.il@majordomo.ieee.org on 04-01-2003 10:46:59 PM Please respond to ITL-EMC User Group itl-...@itl.co.il Sent by: owner-emc-p...@majordomo.ieee.org To: Emc-Pstc Group (E-mail) emc-p...@majordomo.ieee.org cc: Subject: EN 60601-1-2/ EN 55022: 1998 Dear All, I have read in various places that the new edition of IEC/EN 60601-1-2 is in effect (FDA in the US). As yet, only EN 60601-1-2: 1993 is listed in the OJ (December 2002). Does anyone know when the new edition will be listed in the OJ and thus become official? Regarding EN 55022: 1998 + Amendment A1: 2000, I have also read that the application of this standard is being delayed. Does anyone have any information as to when it will become applicable? Thanks David Shidlowsky Technical Writer EMC Laboratory ITL (Product Testing) Ltd. Kfar Bin Nun Israel Tel: +972-8-9797799 Fax: +972-8-9797702 Email: dav...@itl.co.il http://www.itl.co.il http://www.i-spec.com This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail message in error, please return by forwarding the message and its attachments to the sender. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
