Hello Ramesh - Your best bet is to prevent the discharge from occurring in the first place. Unless the addition of insulation barriers will affect your cooling, I suggest you either block the airgaps in the tool (i.e remove the holes) or add insulation over the board area that is affected. Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) 3032042974@xxxxxxxxx (e) charles.grasso@xxxxxxxxxxxx (e2) chasgrasso@xxxxxxxxx -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Ramesh N Sent: Tuesday, September 23, 2014 4:48 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] ESD failure - need advise Hello Experts, Greetings!!! we are having ESD fail (in regulatory testing) in one of our design. It's simple wireless DAQ system with 2 boards [controller PCB + LED/Sensor PCB]. FPC cable (5") is used as interconnect.Package is abs plastics. Light-pipe is used for the for led indication. When +8kV is applied through air discharging, inadvertent LED trigger occurs . Randomly, system is also hanging when multiple zapping applied (especially for 8kV voltage level). I have tried to limit airgaps, added filter caps, etc but issue is not entirely solved. Is there any ESD simulation/analysis tool available for addressing this failure analysis? Any help/debug tips related to this would be very helpful. Thanks and regards, Ramesh ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu