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| Date: | Tue, 7 Sep 2004 12:56:19 -0400 |
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I always use the square times two for our calculations. This means you
will always be on the low side since you don't figure in the components.
Bruce Stilmack
GDLS-TO Manufacturing Engineer
(850) 574-4773
[log in to unmask]
Graham Naisbitt
<Graham.Naisbitt@CON To: [log in to unmask]
COAT.CO.UK> cc:
Sent by: TechNet Subject: Re: [TN] Surface Area calculations / Cleanliness test
<[log in to unmask]>
09/07/2004 12:45 PM
Please respond to
TechNet E-Mail
Forum; Please
respond to Graham
Naisbitt
Robert
If you need this info to run cleanliness test - urghh I hate that
expression
- then as a ROT (Rule Of Thumb) take the square of the board and multiply
by
3 - that's both sides plus an allowance for the componentry. Don't forget
you have the surface top AND bottom to account for....
If you are out it will almost certainly be on the low side, and for Ionic
Contamination Testing (there, now I feel better) this might be a good thing
not a bad thing.
What do I mean? Well, if the surface area is lower than reality, then the
result will suggest that there is more contamination per square than there
might be, which in turn means you might improve your cleaning operation to
get the desired result and that cannot be a bad thing - surely? (Empty
Mountain Dew Cans incoming?)
--
Regards Graham Naisbitt
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Concoat Limited - Engineering Reliability in Electronics
A British Manufacturer
www.conformalcoating.com www.concoat.co.uk www.concoatsystems.com
Golf Quote of the week: Every time I try to tell myself this is going to be
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> Hi T'netters;
> Is anyone aware of a program that calculates the surface area of
> components so I can more accurately determine the surface area of PCB
> assemblies?
>
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