Hi All, We were recently discussing contact discharges at high voltages, like 20 kV, being very far from reality.
There is a way to make a nice repeatable contact discharge corresponding to high voltages by filtering the output of the ESD simulator. Here is one example intended for another purpose but fits the bill. The simple ferrite filter slowed the risetime and clipped off the initial spike, both characteristic of high voltage discharges in air, but much more repeatable than a real air discharge. Here is the article: https://emcesd.com/tt2005/tt090105.htm Here are a few more of my Technical Tidbits on filtering contact discharges: https://emcesd.com/tt2006/tt090106.htm low pass filtering https://emcesd.com/tt2006/tt090106.htm high pass filtering By filtering contact discharges, we can make them more realistic at high voltages but still keep the repeatability of the contact discharge compared to air discharge. At 4 kV contact discharges are much like air discharges for the current waveform, so we are OK there. By the way, here is some data on air discharge repeatability: https://emcesd.com/tt2011/tt040711.htm current measurements at 8 and 15 kV https://emcesd.com/tt2012/tt030712.htm current measurements on system cables from air discharges This is just a tiny sample of data that I have. More recent, official data (not on my website) I took at Barth Electronics in Boulder City, Nevada, USA. They have the most accurate and elaborate equipment I am aware of for measuring current and E-field emissions from ESD simulators in the world. They are very convenient to me, about a 15 minute run from my office (on foot, of course). Doug [cid:[email protected]] - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
