How do I do this test?
Good morning, I have a Class 1 product. It has a double insulation barrier between Primary and earthed SELV, and basic between primary and the metal enclosure. How can I perform an electrical strength test across the primary/SELV barrier? I believe I must disconnect the 'earthed' connection - not so easy as there are a number of earthed fixing point - and ensure sufficient clearance. ... and if I want to do perform this test on a production line . I am aware that 950 indicates basic insulation between Primary and earthed SELV, but our test house advises double. Also 61010 indicates double insulation barrier. Am I missing something? Many thanks. Vic Gibling Compliance Engineer e2v technologies Ltd. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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 All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
South Africa radio approvals
Hello, I am trying to identify the necessary approval requirements for placing an intentional radiator ( radio vehicle alarm) in South Africa. I have contacted SABS via email. Has anyone any experience/ guidance or suggested websites I would be most grateful? Many thanks Vic Gibling Compliance Engineer e2v technologies Ltd. Waterhouse Lane Chelmsford Essex CM1 2QU Phone:+44 (0) 453352 email: vic.gibl...@e2vtechnologies.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: 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
More profound than a joke
In the UK cigarette packaging includes a large information message indicating the health risks associated with using the product. The following dialogue would have been funny had it not been true. Could I have a packet of 20 cigarettes please?, the man asked. What would you like? the assistant replied, Those that kill you with lung cancer or those that give chronic heart problems? Mmmm. I take those that can harm the baby in the womb. Was the man matching the assistants humour/sarcasms? OR Was he ignoring the warnings, it's not going to happen to him? OR Was he making a rational risk assessment based on the information provided by the manufacturer? Vic Gibling e2v technologies Ltd 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: circular connectors for power meeting EU regs
Were you going to use the contacts at maximum current rating? No. At the lowest voltage the current would be 20A, the maximum rating for the connector is 35A (derated 50°C). Incidentally, I have spent some time today searching for a suitable connector. What I have noticed is that there are many to UL1977. Do I understand these are unacceptable for use with primary circuits or can they be used providing I carry out additional tests, like the mating/unmating endurance? Thank you for your interest. Vic From: Enci [mailto:emc-p...@cinepower.com] Sent: 26 August 2003 15:35 To: 'emc-p...@majordomo.ieee.org' Subject: RE: circular connectors for power meeting EU regs At 14:19 26/08/2003 +0100, Gibling, Vic wrote: Did you get a satisfactory answer from the forum? I ask as I just been told by a test house that the ITT-Canon CGL Industrial power connector we had wanted to use as a primary coupler is not suitable - apparently should only be used with secondary circuits. ( I believe this is the connector my colleague (boss) proposed to you via the forum ) We had assessed it against the 309 connectors for leading earth, creepage, clearance and isolation voltage. Alas the test house statedYou will find that the contacts will quickly deteriorate if you were to carry out a mating/unmating endurance test at maximum current rating. Were you going to use the contacts at maximum current rating? 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: circular connectors for power meeting EU regs
David, Please excuse me for contacting you direct. Did you get a satisfactory answer from the forum? I ask as I just been told by a test house that the ITT-Canon CGL Industrial power connector we had wanted to use as a primary coupler is not suitable - apparently should only be used with secondary circuits. ( I believe this is the connector my colleague (boss) proposed to you via the forum ) We had assessed it against the 309 connectors for leading earth, creepage, clearance and isolation voltage. Alas the test house statedYou will find that the contacts will quickly deteriorate if you were to carry out a mating/unmating endurance test at maximum current rating. So I must find a replacement. Did you find any useful contacts I could share please. Many thanks Vic Gibling Compliance Engineer e2v technologies Ltd Waterhouse Lane Chelmsford ESSEX CM1 2QU Telephone: +44 (0) 01245 493493 Direct Line: +44 (0) 01245 453352 Facsimile: +44 (0) 01245 453410 E-mail: vic.gibl...@e2vtechnologies.com Internet: www.e2vtechnologies.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: 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
What is the background to the formula....
Hi, The following formula was stated in a report covering Radiated Spurious Emissions: Field Strength = SQRT(Po x R)/D Where R was given as 50ohms and D as 3 metres. Can someone please give me some background to the formula? Many thanks Vic Gibling 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: CE mark on development/evaluation boards ?
Hello Anthony, I have experience of such a product (7 years ago). Compliance to the EMC Directive was achieved through the Technical Construction File route with guidance from a Competent Body. Emission testing was performed with scope probes and logic analyser looms attached as well as any interfacing cables, but no immunity testing as far as I can remember. The general approach was to assess the measured emissions, and there were some howlers too, taking account of the where and how the product was used. Nothing was done to suppress the high emissions( 60dB at 10 metres). The risk was considered acceptable based on the discrete frequency, likelihood of interference and that the emission would not be on continually (!!). It was also necessary to inform the customer that the product: should only be operated in an industrial test and development area; that it could be susceptible to ESD, mobile phones etc; if it was to cause interference then, use ferrites, move/reorientate it or the victim; etc etc. Hope this helps Vic Gibling Compliance Engineer Internet: www.e2vtechnologies.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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
Contactors to BSG132
Hello to all, Could someone please explain the essential requirements for a contactor designed to meet BSG132? Such a contactor is required by DEF STAN 59-41 DCE03 Exported Transients Power Lines. Many thanks Vic Gibling e2v technologies Ltd 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
Is this a case of basic insulation?
Hi to you all, We would appreciate your views please. We drive a FET based H-bridge from rectified 230VAC mains; thus 320Vpk across the bridge. We have assumed the insulation between the rectified power return and chassis (Class 1 product) is basic, thus requiring 4mm creepage (IEC950). The proposed FETs need to be attached to a heat sink and we would like to use the chassis for this purpose. Our problem is that the FETs have around 2mm creepage between their exposed heatsink surface and the fixing screw, insufficient to meet the basic insulation creepage distance. Is our interpretation regarding basic insulation correct/reasonable? If we use an insulative thermal pad between the FET and chassis, does the compression of the pad exclude the air path thus offering sufficient protection? I am aware of such pads offering 4.5kV breakdown. Thank you Vic Gibling Compliance Engineer e2v technologies Ltd Waterhouse Lane Chelmsford ESSEX CM1 2QU Telephone: +44 (0) 01245 493493 Direct Line: +44 (0) 01245 453352 Facsimile: +44 (0) 01245 453410 E-mail: vic.gibl...@e2vtechnologies.com Internet: www.e2vtechnologies.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: An ESD question
Thank you all for your comments and advice, it is appreciated. For your interest, the product had gone through approval and though there were some ESD induced abnormalities these were considered a low risk. It was the reports from two independent customers regarding a particular failure mode that led to this investigation. To achieve this particular failure mode we had to reduce the level to -800V ; I should point out that at higher levels, other failures were infrequent. What is probably more 'interesting' is that both customer's method of use was different, though valid, to the way we had perceived. As an aside, when working on compliance problems I am often reminded of the following: When looking for the light at the end of the tunnel, make sure you are not in a cave Thanks again, Vic Gibling Compliance Engineer (in the making) Marconi Applied Technologies --- 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
An ESD question
Dear Group I tried to find David Pommerenke article's in the Journal of ESD on the Web but alas no downloadable version was found, so may I ask the group a question? We have an ESD field failure which is occurring in dry hot countries ( no surprise )which can be recreated with an ESD of -800V. In an attempt to get a high incidence of discharges we used a dehumidifier to create a dry environment. The result was a reduction in discharges. Thinking the problem through -now- as a dry atmosphere will encourage the production of high level ESD and a humid environment inhibits the charge to a lesser level, presumably because it 'leaks' away. Then is it wrong for us to attempt to 'dry' the local atmosphere in the hope of gaining consistent ESD from an ESD gun, that is to say the more humid the environment the more efficiently the discharge will transfer to the victim? Incidentally, to add to the thread regarding intermediate level testing for ESD and EFT. This exercise has revealed different failure mechanisms at different ESD levels. Your views would be appreciated. Vic Gibling Compliance Engineer Marconi Applied Technologies --- 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
EFT Capacitive Clamp
Hi to you all, Referring to EN61000-4-4 Figure 7 General set-up for laboratory type test. Two reference planes are shown. One along the bottom edge of the figure which I believe implies a plane beneath ALL equipment shown - e.g. the floor of a screened room - and a second plane specifically beneath the capacitive clamp. If testing is performed in a screened room, is the second reference ground plane required? If it is required should it be bonded to the overall reference plane ( it is insulated from the overall reference plane by floor tiles)? If not required should the clamp be bonded to the overall reference plane? Your views and comments would be most appreciated. Thank you Vic Gibling Compliance Engineer Marconi Applied Technologies --- 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
