Doug,

Have you reached out to C63? This information could be included in the next 
edition of  IEEE C63.16 -->
“American National Standard Guide for Electrostatic Discharge Test 
Methodologies and Acceptance Criteria for Electronic Equipment”

Thanks,


[cid:image075342.jpg@52D522C7.F6E00B9E]
David Schaefer​​​​
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Element Materials Technology
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From: doug emcesd.com [mailto:d...@emcesd.com]
Sent: Monday, May 27, 2024 9:10 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Product reliability in the field relating to standards testing


CAUTION:This email originated from outside of Element Materials Technology. DO 
NOT click links or open attachments unless you recognize the sender and know 
the content is safe. Please contact the TOC if you are in any doubt about this 
email.
IEC61000-4-2 has been around for a long time. About 30 years ago myself and 
others presented to tc-77b improvements that were (and still are) needed.
Those concerns still need to be addressed.  Our current standard has us 
addressing ESD stresses that cannot happen and on the other hand ignoring 
stresses that do happen. I touch on these in detail in my classes to help my 
clients.

Layer on this trying to arrive at a good model for real world conditions, an 
issue in all EMC related standards. I would like to address the human body 
model for a small piece of metal in the hand. My personal discharge, as 
measured by the instrumentation at Barth Electronics (right here in Boulder 
City, Nevada) is completely different than the model in 61000-4-2. The Barth 
instrumentation is the best in the world and I feel fortunate to be near them, 
about a 15 minute run away.

My small metal discharge is very different in two ways. First, the body wave 
after the first peak has much less energy in it than in the standard. This most 
likely is easily explained because I have an athletic body from 45,000 miles of 
running and most likely does not affect test results all that much.

However, my initial peak current is more than twice that in the standard using 
a 5 GHz bandwidth. Since the speed of light is one foot per nanosecond, nothing 
further away than my elbow can affect this part of the discharge waveform. And, 
this will affect test results. I think we need new data taken at a 5 GHz 
bandwidth.

Separate from the above, we would like to minimize field issues from 
environmental stresses. So, I developed an interesting apparatus using an 
instrument from the chemical/materials industry coupled with an easy to make 
"antenna" that generates radiated EMI that is very severe. It takes out HDMI 
and other signals in the room when it is in use. But if it does not affect a 
design one can be reasonably sure one's device is not going to have problems in 
the field or at least you will know what the product response is, and if it is 
dangerous. I just finished building a better antenna from parts in our local 
Ace Hardware store. Starting now I will be demonstrating it for my attendees as 
part of my seminars, including one coming up. It will be interesting to see how 
it affects different products.

Doug Smith
Sent from my iPhone
IPhone: 408-858-4528
Office: 702-570-6108
Email: d...@dsmith.org<mailto:d...@dsmith.org>
Website: http://dsmith.org<http://dsmith.org>
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