Werner,

     I understand your point, but the temp stress really is relative to
the product being tested and the purpose of the testing.  In one case I
perform infant motality screen at -10C to +70C while the product runs
through functional testing.  There are other stresses applied at the
same time....voltage...frequency...etc...  It really is impossible to
give a blanket statement that a specific temp stress is good for all
applications.  There are a lot of variables that need to be considered
in each case.  A better question for a newcomer may be.....What
variables should I consider and what is the formula to determine the
proper stress temp.  It's not an easy process.

Barrie

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Wednesday, September 13, 2006 10:43 PM
To: [log in to unmask]
Subject: Re: [TN] Temp Testing

Hi Barrie,
 -10C to +70C is not an ESS environment--it would screen out very
little, if
anything. This T-range could serve as a burn-in, but not as a screening
procedure.



Werner

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