We are getting off the track of my original question. Given that the test
procedures are identical (number of hits, location, air discharge, etc.)
will one gun (IEC 801-2 or EN 61000-4-2) yield worse results than the other?
The best information I have at this point is that the speed of approach is
the major contributor to differences between results, even with the same
gun.
----------
From: Michael Hopkins [SMTP:[email protected]]
Sent: Wednesday, September 12, 2001 7:13 AM
To: Patrick Lawler; EMC-PSTC
Subject: Re: ESD Testing
May be some confusion here::
There is NO published version of 61000-4-2 that specifies 50
discharges. It
may be in CISPR, but not in the IEC basic standard..
There are some amendments to IEC 61000-4-2, but these deal with use
of the
HCP, identification of "operator accessable points", and testing of
double
insulated products.
Now, there IS an early draft version of a revision of IEC 61000-4-2,
which
at this stage is a working draft within SC77B WG9. (There was a CD
issued,
but there have been many, many significant changes to this document,
and is
far from a version that could be circulated to industry.) This draft
does
talk about 50 discharges per point; however, I emphisize: THIS IS A
WORKING
DRAFT --- it is NOT likely to be published as it now stands.
Additionally,
WG9 met Monday and yesterday (September 10/11) and made many changes
to the
document and I don't anticipate another CD for several months.
Hope this helps. It's always a problem when early drafts of
documents begin
to circulate.
Michael Hopkins
Thermo KeyTek
Member, SC77B WG9
Convenor, SC77B WG11
----- Original Message -----
From: "Patrick Lawler" <[email protected]>
To: "EMC-PSTC" <[email protected]>
Sent: Tuesday, September 11, 2001 8:15 PM
Subject: Re: ESD Testing
>
> I don't have the IEC 61000-4-2 ammendment, but CISPR24:1997
> (Immunity for ITE) does have the phrases
> "... a minimum of 50 discharges at each point",
> and
> "... test points shall receive at least 50 direct contact
> discharges."
>
> Maybe this is what you were thinking about.
> ---
> Patrick Lawler
> [email protected]
>
>
> On Mon, 10 Sep 2001 13:25:49 -0700, "Doug McKean"
> <[email protected]> wrote:
> >Both are 8kV air discharge, both require performance criteria B,
> >but I'd say the current version of 61000-4-2 is more severe.
> >
> >Doesn't the current IEC 61000-4-2:1995 + A1:1998 version
> >require a minimum of 50 hits per test point whereas the 1984
> >version didn't? I don't remember the specifics of the 84 version
> >and I don't have any reference to it.
>
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