Hi Chaz, I have great respect for Lee's opinions, but I suspect this one may have been slightly mis-spoken. Even with the now ,admittedly, limited response of the Pelligrini target, it is acknowledged that the ideal ESD waveform has frequency components in the GHz region. In defense of Mr. Ritchey, once a contact discharge event is coupled onto a relatively large conducting structure, only the current event remains high frequency. The frequency components of the voltage event may be significantly reduced both in amplitude and frequency. The magnitude of the effect really falls back to the relative impedance of the of the "victim" circuit. Low Z, H field is an killer. High Z, E field is an killer. Best regards sir, Brent DeWitt (still looking for a job folks!) www.home.ix.netcom.com/~bdewitt Loveland, CO > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Grasso, Charles > Sent: Wednesday, March 03, 2004 4:45 PM > To: 'leeritchey@xxxxxxxxxxxxx'; 'Chris Padilla'; > 'si-list@xxxxxxxxxxxxx'; 'W. Michael King' > Subject: [SI-LIST] ESD is a low frequency event -really?? > > > Lee - I really must take issue with you on a statement you made in a > chassis ground thread. > > In it you said: "You don't need to tie logic ground to the case > many places > to control ESD. ESD is a relatively low frequency event that can..<SNIP>" > > This is pure nonsense. > ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu