I think a good test would be HALT/HASS (Highly Accelerated Life Test/Highly
Accelerated Stress Screening).  This will push assemblies to failure and
tell you if possible flux residues are a major weak point in the product.
Difficult and cryptic to interpret but faster than traditional life testing.

Brad Vanderhoof
AITI


----- Original Message -----
From: "Bloomquist, Ken" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, March 20, 2003 1:42 PM
Subject: [TN] Flux Contamination Testing


> I have a question regarding a test for flux contamination on conformally
> coated boards.
>
> I know all about testing uncoated boards but was wondering if there are
any
> tests for type UR coated boards?
>
> Does a temperature soak do any good at bringing problems to the surface?
>
> Does baking cause any remaining flux to become conductive?
>
> Does a humidity/temperature soak do any good?
>
> What were looking for is a parallel electrical path that might reduce the
> value of a small SMT resistor.
>
> Thanks in advance,
>
> KennyB
>
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