Vic: The ambient relative humidity should have no impact on the performance of the gut but only on the generation of static charges. So, to improve the performance in the field, I would suggest that you increase the R.H. at the customer site(s) to about 50% which would eliminate the generation of electrostatic charges and consequently the problems. This will give you time to work on the equipment to minimize ESD susceptibility. By the way, lower R.H. also occurs at low tamperatures. Please let me know how things work out. Bogdan.
Gibling, Vic wrote: > 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" ------------------------------------------- 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"
