Steve,
I noticed someone else making the same suggestion - using SIR testing.
I can go a little further, if you want to drive the message home: Our system
has a programme that will take a SIR reading at only 1 second intervals and
measuring at picoamp levels.
In this way, we can show SIR influences simply by breathing over the
coupon - mush less depositing a liquid on the surface. We can grow a
dendrite in only a few seconds and if you have a vision system over the
coupon, the visual results are effective!
If you would like more, let me know - maybe we could loan you the unit for
such a demo.
Regards, Graham Naisbitt
[log in to unmask]
Concoat Ltd Phone: +44 1276 691100
Alasan House Fax: +44 1276 691227
Albany Park
CAMBERLEY
GU15 2PL UK
Any opinions expressed are those of this employer.
-----Original Message-----
From: Stephen R. Gregory <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 03 September 1998 21:43
Subject: [TN] Cleanliness Experiment/Demonstration Ideas?
>Hi Ya'll!!!
>
> I was wondering if anybody has any good Ideas that will graphically
show
>people the importance of proper cleaning. Let me preface this a little; I
want
>to come up with some way that will hit home to our rework people that hand
>cleaning after touch-up doesn't cut it. There's a couple of operators that
I
>know that aren't convinced that what they're doing is very detrimental to
long
>term reliability, otherwise they wouldn't do it. Worse yet, their
supervisor
>I know, thinks I'm some sort of anal retentive cleanliness freak that's
making
>much ado about diddley.
>
> I've shared many articles about field failures due to
electromigration
>with everyone, tried to explain the basic science behind what's happening
>when electromigration occurs, but I'm afraid I'm not making an impression
>because I still catch operators hand cleaning assemblies that should be
going
>through the inline cleaner.
>
> I feel that if I had some sort of "show and tell" experiment that I
>could run here, and they could see with their own two eyes what goes on
with
>the residues left from hand cleaning, might be a little more effective to
show
>them the error of their ways better than me lecturing to them about the
evils
>of hand cleaning an assembly.
>
> I know that there's probably a few of you thinking; "If I had an
>operator that wouldn't follow the processes I set, then hasta la vista
>baby...hit the road." Believe me, I've thought about it...but except for
this
>one issue, they're skilled people. Something else I've thought about at the
>same time was something I learned in the Navy, that if you're having
problems
>with an individual, you don't give them orders to another duty station to
get
>rid of the problem, because you may see that individual again at your next
>duty station still with the same problems. I feel it's the same with the
>operators in question, I'd rather try to get rid of the bad habits rather
than
>fire someone, because here in silicon valley, it's a small world when you
work
>contract manufacturing...I just might see that operator again at the next
>company I work at.
>
> Any idea's any of you have would be most appreciated!!!
>
>-Steve Gregory-
>
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