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March 2000

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Subject:
From:
"Ingemar Hernefjord (EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 24 Mar 2000 16:04:51 +0100
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Nice to see you again, Bev. As you are now a company head I thought you said adieu to TechNet for good.
Ingemar Hernefjord

Subject: Re: [TN] process control of final cleanliness in a no-clean
world


Wade,
Further to what Doug wrote,  you can also correlate cleanliness tester
readings to what you "normally" (or otherwise ;(  )   see on your boards.
In the early 90's, while I was with Nortel Networks, through a two-lab test
program we found that most circuit packs manufactured with wave or foam
fluxers and no-clean fluxes gave values of 2.5 to 4.5 SOD for a particular
brand of cleanliness tester.  6-8 we took as yellow light and above 10 as a
red light situation - the board probably took a bath in a flux wave and you
usually had flux residues in your edge connectors - not a good scenario.
Pretty seat-of-the -pants, but better than nothing.

Bev Christian
XLTEK

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