If the product contains mechanical devices such as disk, floppy, DVD etc and has s/w that has operation cycle times in the neighborhood of 1s or so then the 0.1 to 10 s may have very different results at different points in that timing range.
--- Gary McInturff <gary.mcintu...@worldwidepackets.com> wrote: > > ESD susceptibility has a couple of components. Simplistically, > don't let it happen or try to direct the energy where you want it, and does > the event happen at just the right (wrong?) time. Just as a critical gate is > changing states for example. Given the relative rate that modern processors > are running 800 Mhz - 1 Ghz, I don't know that increasing the discharge rate > from a second to 20 or even 50 times a second really increases your ability > to capture one of these states. Having said that, I don't really have a > quarrel with increasing the rates for investigative purposes, I have done it > myself. However, I think you should keep in mind the heating of > silicon junctions etc, from the rapid discharge rates. Even non-critical > gates can be artificially damaged by rapid pulses. I can't think of a case > when an ESD discharge (not lightning etc) naturally occurs at very high > rates. I'd be interested in examples if it does occur. > Not a bad diagnostic tool but I wouldn't care to see higher rates > implemented in standards. > Gary > (You can't expect much for two cents these days) > > -----Original Message----- > From: HALL,KEN (HP-Roseville,ex1) [mailto:ken_h...@hp.com] > Sent: Thursday, August 02, 2001 7:53 AM > To: 'Michael Hopkins'; am...@westin.org; emc-p...@majordomo.ieee.org > Cc: AGUILAR,LONNIE (HP-Roseville,ex1); 'Pommerenke, David' > Subject: RE: ESD - time between successive discharges > > > > Hello all, > > If I remember correctly the one shot/second was to allow "older" simulators > time to recharge. > > We believe that the probability of identifying an ESD susceptible product is > increased dramatically when subjecting the product to continuous discharges. > > > Ken Hall > > Lonnie please file. > > Thanks, > > Ken > > > > -----Original Message----- > From: Michael Hopkins [mailto:mhopk...@thermokeytek.com] > Sent: Thursday, August 02, 2001 3:48 AM > To: am...@westin.org; emc-p...@majordomo.ieee.org > Subject: Re: ESD - time between successive discharges > > > > Seems to me the time between discharges is the same as the time between > pulses (I believe that was the intent). I don't have the standard in front > of me, but I think the max rate was 1/second, which means you could go > slower. In most tests I've seen, the several discharges at one point are run > at the 1/second rate, but then there could be several seconds or more > between the discharges at that point and the discharges at the next point. > At least one company actually runs tests at much higher discharge rates and > with many more shots/point than IEC recommends (the new draft of ANSI C63.16 > goes to 50 shots/per point). > > Michael Hopkins > Thermo KeyTek > > ----- Original Message ----- > From: <am...@westin.org> > To: <emc-p...@majordomo.ieee.org> > Sent: Wednesday, August 01, 2001 4:06 PM > Subject: ESD - time between successive discharges > > > > > > Dear members, > > > > From IEC61000-4-2 and several EN-product standards, they specify the time > > between successive discharges to be at least 1 second. > > > > But what is the maximum time between each pulse ? I can not see that it is > > stated in any standards. I guess the test labs use 1 pulse pr second. > > > > I feel that the pulse rate can have influences on the EUT performance, so > 1 > > second compared to 3-5 seconds might be the difference between PASS and > FAIL. > > > > Any suggestions ? > > > > Best regards > > Amund Westin > > Oslo, Norway > > > > -- > > Get your firstname@lastname email for FREE at http://Nameplanet.com/?su > > > > ------------------------------------------- > > This message is from the IEEE EMC Society Product Safety > > Technical Committee emc-pstc discussion list. > > > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > > > To cancel your subscription, send mail to: > > majord...@ieee.org > > with the single line: > > unsubscribe emc-pstc > > > > For help, send mail to the list administrators: > > Michael Garretson: pstc_ad...@garretson.org > > Dave 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://www.rcic.com/ click on "Virtual Conference Hall," > > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave 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://www.rcic.com/ click on "Virtual Conference Hall," > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave 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://www.rcic.com/ click on "Virtual Conference Hall," > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave 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://www.rcic.com/ click on "Virtual Conference Hall," > ===== 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!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.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: Michael Garretson: pstc_ad...@garretson.org 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://www.rcic.com/ click on "Virtual Conference Hall,"
