Matt,
The cleaner the boards, the better.  For the telecommunication industry the
Bellcore spec is 1 SOD (1 microgram of sodium chloride equivalent per square
centimeter for incoming bare boards.  There is no distinction made on the
basis of how the printed circuit packs are manufactured.  We use essentially
what you have for checking board cleanliness.  But because we have a full
fledged lab that also does some R&D we will also be cranking up in a new IC
in the fall.  Doug Pauls who is on Technet can tell you a lot more about
this technique of monitoring.

regards,
Bev Christian
Nortel

> ----------
> From:         Matthew Sanders[SMTP:[log in to unmask]]
> Sent:         Monday, July 27, 1998 6:44 PM
> To:   [log in to unmask]
> Subject:      [TN] No-clean and board incoming cleanliness
>
> Hello all,
>
> We will be moving to no-clean processing soon, and I was concerned about
> the
> cleanliness of boards incoming from our vendor. Do I need to expect
> cleaner
> boards? What are reasonable limits to set for my board specs? How can I
> measure these (just with my Ohmegameter, or are there other species of
> contaminants that I should worry about)? I looked through the old Technet
> archives and didn't find too much about this.
>
> Thanks for your help,
> Matt Sanders
>
> Matthew Sanders
> PWB Procurement Engineer, Trimble Navigation Limited
> [log in to unmask]
> Phone: (408) 481-7817
> Fax: (408) 481-8590
>
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