Conductivity of rinse water, although related to the ionic contamination
levels of the actual boards, does not reflect the actual board
contamination. Some panels will rinse more easily than others because of
the circuit geometry, thereby allowing insufficiently cleaned panels to
proceed, even though the DI rinse indicates low conductivity suggesting
clean boards. However, ionic contamination testing will reveal problems.
Circuit board customers would not like this contamination in any
circumstance, and particularly in high stress applications whereby shorting
will result in failures.

Regards,
lenny kurup

On Thu, 13 Nov 1997, Ken Patel wrote:

> SMT/Wave Process Expert,
>
> If the conductivity of the DI water of wash machine is maintained along with
> good maintenance of the wash machine, do we still feel that it is always or
> must to have ionic contamination measurement equipment like one of that
> Alphametal makes?
>
> I am really interested in pros and cons of having such system from need
> point of view rather than sales pitch (to show to prospective customers).
>
>
> Re,
> Ken patel
> ______________________________________________________
> Ken Patel                       Phone:  (408) 490-6804
> 575 Cottonwood Dr.              Fax:    (408) 490-6859
> Milpitas, CA 95035              Beeper: (888) 769-1808
>
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