Brian,
If you would be so kind as to share the reference to the standard that you
site in your email, it would be appreciated. I for one, am interested in
any information you can provide on this subject.
Best Regards,
Joe Russeau
Process Analyst
Precision Analytical Laboratory, Inc.
4106 Cartwright Dr. Ste. A
Kokomo, IN 46902
P: 765-455-1993
F: 765-455-1996
E: [log in to unmask]
----- Original Message -----
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 27, 2005 5:00 AM
Subject: Re: [TN] Omegameter to IPC-TM-650, Method 2.3.25 cross reference
> Perhaps I should have mentioned that the UK military issued a standard
> test method in 1986 that did remove many of the ignored variables of the
> US standard test method. If anyone is interested, I can look up the ref.
> and put it on here. Incidentally, as a result of several years research,
> led by Alan Stopes of the Aquila research centre in Bromley, Kent, the
> same spec actually recommended the use of water-soluble fluxes, over
> rosin-based ones, provided that the process was controlled according to
> their test method.
>
> Another point that should have been brought up is the fact that all
> these specs were developed long before SMT saw the light of day. The
> finest track/spacings in those days were ordinarily about 0.5 mm, 0.3 mm
> being almost state-of-the-art. The components were better spaced than
> today with larger stand-offs. Today's assemblies, especially HDIS, are a
> whole new kettle of fish and to apply standards that are 35 years old to
> them is just plain, plumb, crazy.
>
> Still one more: how many people have tried to apply ionic contamination
> testing to "no-clean" fluxes? This is even plainer, plumber, crazier,
> without MANY qualifications. These tests were developed as a reasonably
> easy process control for the quality of cleaning, not for determining
> the nature of the residues on uncleaned assemblies.
>
> My advice: forget blanket figures. Do as I say in my earlier post by
> simple statistical process control on qualified and proven products.
>
> Not to blow my own trumpet but simply as a statement for the younger
> ones here who have never heard of me that my credentials involve much
> research in this subject from 1975 to 1997 (when I "retired"), having
> developed many instruments for this and other cleanliness testing
> methods, including two of the most sophisticated ionic contamination
> testers that have ever appeared on the market.
>
> Brian
>
> Macko, Joe @ IEC wrote:
> > Fellow techs,
> >
> >
> >
> > Good morning.
> >
> > We have an Omegameter 600SMD that is used to check boards for ionic
> > contaminates. The ionic residue limit within J-STD-001C, para. 8.3.6 is
10
> > ug/sq. NaCl. Some personnel believe that this number should be adjusted
> > based on the actual instrument used (e.g., an Omegameter). Would
someone be
> > so kind as to comment on this subject and what the correct limit is for
an
> > Omegameter type of instrument.
> >
> >
> >
> > Thanks
> >
> > joe
> >
> >
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