It checks the integrity of the plated through holes and what their life will
be.  Talk to Bill Burch at PWB Interconnect 819-684-9849, he is both the
machine builder, offers testing, and the recognized expert on the subject.
There is also an IPC-t-650 method for the testing plus will soon be a
technical report from the IPC on IST.  The web site is
http://www3.sympatico.ca/gerard.gavrel/ist.htm

> -----Original Message-----
> From: Gen Gibbard [SMTP:[log in to unmask]]
> Sent: Wednesday, May 02, 2001 3:01 PM
> To:   [log in to unmask]
> Subject:      [TN] IST - what is it?
>
> Hi, I know that an IST test can be performed on an ENIG finish board, and
> I
> know it stands for Interconnect Stress Test.  I also know that it involves
> current pulses for the purpose of thermal cycles on the PCB.
> What I want to know is, what is the purpose of it?  What does it tell you
> about the PCB?
>
> Also, I wanted to know what type of tape is used to perform a tape test on
> an ENIG board to check for black pads.  We just got some sample boards of
> ENIG finish and want to perform some in house tests.  We normally get HASL
> finish on all our PCB's but realize that the industry is slowly moving
> towards other finishes in order to, amongst other reasons, get rid of
> lead.  So to be proactive we are starting to evaluate alternatives.
>
> Thanks for your time.
>
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