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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