Hi All,
I was able to measure in my lab late tonight, a very important extension
of an effect I discovered earlier. That discovery describes how some
power supplies can take in a single ESD pulse and generate from it many
ESD pulses of both polarities with both human metal model and cable
discharge current waveforms embedded in corona discharges from the
single original ESD pulse.
Tonight, I was able to create the same effect using EFT (electrical fast
transient) pulses. Some power supplies can take a single EFT pulse and a
microsecond to several microseconds later generate one or more EFT
pulses, some larger that the stimulus one, embedded in corona discharges!
This is very bad as EFT occurs much more than ESD and is not visible to
equipment operators. The EFT can be amplified and made worse by some
power supplies! This could easily the the cause of equipment failure
either at compliance testing or in the field.
This appears to be a new phenomena that I have not seen published. I
have been able to reproduce the ESD version at a NASA Ames laboratory,
my own laboratory, and at an ESD test site on the US East Coast using
different ESD simulators and equipment.
If you are interested in this, contact me privately at d...@dsmith.org
or call me.
Doug
--
University of Oxford Tutor
Department for Continuing Education
Oxford, Oxfordshire, United Kingdom
--------------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 60941
========= Boulder City, NV 89006-0941
_ / \ / \ _ TEL/FAX: 702-570-6108/570-6013
/ /\ \ ] / /\ \ Mobile: 408-858-4528
| q-----( ) | o | Email: d...@dsmith.org
\ _ / ] \ _ / Web: http://www.dsmith.org
--------------------------------------------------------------
-
----------------------------------------------------------------
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 <emc-p...@ieee.org>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
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:
Scott Douglas <sdoug...@ieee.org>
Mike Cantwell <mcantw...@ieee.org>
For policy questions, send mail to:
Jim Bacher: <j.bac...@ieee.org>
David Heald: <dhe...@gmail.com>
