I don't think HALT/HASS testing would be useful in this case since that type of testing is performed in dry nitrogen atmosphere. In dry conditions, it is not likely that the flux residues will affect the resistance.

Per-Erik Tegehall
IVF

-----Ursprungligt meddelande-----
Från: BRAD VANDERHOOF [mailto:[log in to unmask]]
Skickat: den 21 mars 2003 08:06
Till: [log in to unmask]
Ämne: Re: [TN] Flux Contamination Testing


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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