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April 1998

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Subject:
Re: Invitation to Participate in Cleanliness Assessment Study
From:
Robisan1 <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 6 Apr 1998 08:56:14 EDT
Content-Type:
text/plain
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text/plain (32 lines) 
In a message dated 98-04-03 15:41:04 EST, you write:

<< f we get readings in NaCl equiv., we still do not have this kind of
 separation, so SIR may not be of any value in answering this question.

 Jon  >>

SIR is the only thing that is going to tell you if the contaminants left
on the board will result in a decrease in insulation resistance or
electromigration.  It is a functional test - has a bias and humidity.
If contaminants are on the board between the combs then you will
see their effect.

The only problem is that in actual production, the contamination is
rarely dispersed over the entire board evenly.  It is usually trapped
between the lands of the most difficult part to clean under and around.

Susan Mansilla
Robisan Laboratory

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