There are two good points about 610000-4-2:the test results are
repeatable and products that pass the tests rarely suffer from ESD
failures in the field. But there are, even so, unresolved issues and
doubts about the relations between the tests and actual ESD events.
Because the present standard 'works', strong evidence would be required
to support a proposal for change, and that is not forthcoming.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I understand.
Xunzi (340 - 245 BC)
On 2023-03-06 14:48, Chas Grasso wrote:
Don't forget the seminal research done by WMKing on this topic. He was
I believe the first to measure the fast response of an ESD event
through a metal intervening object. Also, it is understood that the
ESD test was a consensus output in an attempt to provide repeatability
within test houses. King and Hish also produced an ESD generator that
accurately replicated the research.
The current ESD test is a committee consensus output which tried very
hard to produce a test that could be consistent and repeatable, while
at the same time be as close as possible to the actual event.
On Mon, Mar 6, 2023, 1:42 AM John Woodgate <[email protected]> wrote:
*
This message originated outside of DISH and was sent by:
[email protected]
*
------------------------------------------------------------------------
Yes, 61000-4-2- is not very good, but while you are reluctant to
share your knowledge with the committee, it is unlikely that
anything will happen.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk <http://www.woodjohn.uk>
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I
understand. Xunzi (340 - 245 BC)
On 2023-03-06 04:14, doug emcesd.com <http://emcesd.com> wrote:
Hi All,
I have a few thoughts I would like to share with you on ESD that
have comes out of my private research into the field in recent years.
1. A 2kV air discharge can be much more likely to cause
equipment malfunction than any other discharge of any voltage.
2. There is no natural ESD event comparable to a 15-20+ kV
contact discharge so why test for it? That is designing for
something that is extremely unlikely at best.
3. The IEC61000-4-2 does not very well model real ESD events at
all. One example, my hand metal discharge at 4 kV results a
current spike at the start of the discharge that is more than
twice as high as the standard specifies! This is very repeatable.
The above is just a sample of the research I have generated over
the years. Seems like IEC 61000-4-2 needs an urgent overhaul as I
believe engineers get a false sense of security that passing the
test means reliable field performance, not even close!
Doug Smith
Sent from my iPhone
IPhone: 408-858-4528
Office: 702-570-6108
Email: [email protected]
Website: http://dsmith.org
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