An engineer was evaluating ESD simulators and observed an interesting phenomenon.
> The air discharge tip was placed at a fixed distance of about 1 inch from > a ground reference plane with the simulator set for 30 kV and a healthy > spark was launched by all of the simulators. > > HOWEVER, when he started from some distance and rapidly approached the > grp, one of the simulators appeared to have lost 2/3 of the charge. The > other 3 did not. He base the conclusion on the fact that the spark > launched from about 1 inch for 3 simulators, but launched from about 1/3 > inch from one unit when using the "rapid approach" air discharge method. > Any suggestions on what is happening here? > > Evaluation of simulators is specified using a target with the tip > contacting the target. We > did not see a parameter in the standard that allows one to evaluate the > ability of a simulator tip to hold a charge. Did we miss something? > 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: 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: No longer online until our new server is brought online and the old messages are imported into the new server.
