FreeLists / si-list / [SI-LIST] Re: Testing chips with system level specs

["Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>]

That's my experience as well Doug.
Thanks for taking the time to run the test.

Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx

-----Original Message-----
From: Doug Smith [mailto:doug@xxxxxxxxxx]=20
Sent: Thursday, September 07, 2006 3:29 PM
To: davidjp@xxxxxxx
Cc: Grasso, Charles; dcuthbert@xxxxxxxxxx; SI-List; emc-pstc
Subject: Re: [SI-LIST] Re: Testing chips with system level specs

Hi David and the group,

I thought I would make some measurements. Humidity was not controlled=20
but constant and likely about 40% and room temperature.

I did many discharges into a ground plane through an Fischer F-65 (my=20
favorite ESD current probe) over a period of a several minutes around=20
8 kV. Most all of the discharges were relatively slow but once in a=20
while a fast event occurred. The occasional fast discharge happened=20
whether the approach was fast or slow.

Not sure if doing discharges in succession (5 seconds in between)=20
affects later discharges. If so that might explain some of the=20
results. It seems that there may be some remnants left over from the=20
previous spark.

Doug



Pommerenke, David wrote:

> Charles,
>=20
> On the "really fast discharges" using the Andy Hish simulatior I do
not =3D
> have the data here, as  I am in Germany right now.=3D20
>=20
> But if you look at
>=20
> http://web.umr.edu/%7Etiumr/davidjp/Jour_Estat__high_qual_1995.pdf
>=20
> (the link has %7 in it, that is OK)
>=20
> at figure 10 and figure 11. You see measurements of discharges at 10kV
=3D
> having risetimes of about 100ps or so. That is very close to the limit
=3D
> of the measuremetn system (SCD5000).
>=20
> The physics of the very fast discharges in air discharge is explained
in
>=20
>=20
> http://web.umr.edu/%7Etiumr/davidjp/ESDForum_1993.pdf
>=20
> (kind of old paper, but the physics have not changed).
>=20
> Regards,
>=20
>    David Pommerenke
>=20
>=20


--=20
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