Doug,
The loop area of the current path includes the ESD gun ground wire, ESD
gun, arc path, target, brass plate, plate grounding wire etc..
The screw threads/brass tube seem like an insignificant contributor to
this loop area. So why is that inductance change important?
Have you tried flexible ferrites around the current probe cable to avoid
sparking to the current probe?
Thanks,
Vinu
On 05/25/2016 09:59 PM, Doug Smith wrote:
Hi All,
I have been doing some high voltage measurements of currents lately to
support development of a new troubleshooting and failure mode analysis method
which will be complete shortly. That information will be in my seminars this
summer and eventually next year in a published paper. But at this point I
have posted on my website a target for measuring currents due to discharges
of 50 kV+ that insulates the current probe and with that constraint,
minimizes the inductance of the measuremed current path.
The new method relates to finding possible low probability failure modes that
may occur in the field that are likely missed in normal SI and EMC testing
but may still be important especially to those in the medical, aerospace, and
automotive fields.
The article is at: http://emcesd.com/tt2016/tt052416.htm and contains a ;
surprising picture. Let me know if you notice the surprising feature in one
of the pictures.
The events listed at: http://emcesd.com#BoulderCity show seminars this summer ;
in Boulder City, NV that will contain the final troubleshooting method that I
needed the target above for. By the way, the sum of the experience of the
instructors in the three classes (including me) is about 200 years!
Be sure to look over the main page at http://emcesd.com as I have been adding ;
to it lately, including this latest article.
Doug
University of Oxford
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
Email: doug@xxxxxxxxxx
Web: http://www.dsmith.org
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