Good morning Guy,
Joe Russeau gave a pretty good summary on the IPC-B-52 test assembly and
9202 protocols.  The 9202 is wrapping up some of the Rev A work (I hope)
but is still focused on the B-52 assembly.  It is a good test vehicle and
continues to provide valuable insights into manufacturing processes. The
primary criticism is that it was designed in the early 2000s with
components common to that time frame.  It does not contain some of the more
challenging components like QFNs or mammoth BGAs.  While the B52 does have
areas where those components can be designed in, and some people have, but
I see a whole new vista of SIR tools coming to the market.

I have worked with Mark McMeen and Mike Bixenman of Magnalytics for about
the last 2 years on developing their SIR test system.  I am excited about
the system and plan on getting one myself once the development phase is
done (which is pretty much now).  We are presenting a paper at Apex on some
of  our work to correlate their test card with the B-52.  The Magnalytix
card has QFNs, BGA and the B52 QFP80 patterns.  Mark has also developed a
series of test cards to look at other aspects of residues and manufacturing
processes.  I haven't had this much fun in years.


*Douglas Pauls *| Principal Materials and Process Engr | Advanced
Operations Engineering

*COLLINS AEROSPACE*

400 Collins Road NE, MS 108-101, Cedar Rapids, IA  52498  USA

*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773

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On Thu, Dec 19, 2019 at 2:18 PM Guy Ramsey <[log in to unmask]> wrote:

> We have been exploring the J-STD-001G amendment.
> We think we have a "qualified" process because:
> 1. We have monitored our process for several years and established an
> action threshold at a level that is much lower than the old IPC limit.
> Because with know the "normal" ROSE test result from or Ionograph.
> 2. We have never seen evidence of corrosion on assemblies returned from the
> field. And have no reports of corrosion from customers.
>
> But, we have not done any SIR testing in years. The mix of parts and part
> densities have changed dramatically. We have no reason to trust the old SIR
> test results.
> We would like to gather objective evidence that our cleaning process is
> compliant.
>
> Any experience out there with the Magnalytix system?
> Any advice about test coupon selection?
> Anyone?
>