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Date: | Tue, 10 Jul 2012 11:51:51 -0400 |
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I agree, and Jack Brous's white paper tells just about the same thing.
It's only good for statistical process control.
Karen Tellefsen - Electrical Testing
Alpha / 109 Corporate Blvd./ S. Plainfield, NJ 07080
[log in to unmask]
908-791-3069
From: Brian Ellis <[log in to unmask]>
To: <[log in to unmask]>,
Date: 07/10/2012 11:05 AM
Subject: Re: [TN] Ionic Contamination Test for Non-clean PCBA, is
it really necessary?
Sent by: TechNet <[log in to unmask]>
I'm one of Kevin's "have written a book"! Ionic contamination testing on
"no-clean" assemblies is totally meaningless unless conducted under very
rigorous conditions for the unique purpose of statistical process
control. This may tell you something about whether your process is
constant or not. It will tell you absolutely nothing about the quality
or reliability of your products.
Brian
On 10/07/2012 09:13, WTSJ-Willis Tam wrote:
> Hi Technet,
>
> We have implemented non-clean SMT and wave soldering processes for more
than
> 10 years and there's no any issue, but recently one of our new customer
> required us to buy the Omega tester and set up the Ionic Contamination
test
> for the non-clean PCBA, according to IPC-TM-650. 2.3.25.
>
> We feel the Ionic Contamination test might not be an appropriate test
for the
> non-clean PCBA, but is there any technical paper or industry standard
for
> this topic? We need some supporting documents for further discussion
with our
> customer.
>
> Any suggestion/feedback would be appreciated.
>
> Regards
> Willis Tam
>
>
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