Jim/Alcon:  Having worked for the Navy for 30+ years as a civilan QA type I
must say that I have never seen a design that required or permitted entrapped
flux residue.  I'm not sure that either test you are considering would tell
you much unless it were followed by some version of an extraction based
cleanliness test or SIR testing.  In my mind the best analysis method would
be to take the finished product (prior to conformal coating), conduct a ROSE
(or equivalent) test, subject it to the 10-day cyclic temp./humidity test and
repeat the ROSE test.  An increased level of contamination (lower resistance)
on the second ROSE test would imply that a sufficient quantity of process
residuals remain to cause possible problems in fleet use.
Regards, Jim Moffitt, Technical Director, Electronics Training Advantage,
Indianapolis, IN

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