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Date: | Tue, 19 Feb 2008 13:07:54 -0500 |
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Hi Graham,
Take a look at the latest revision of IPC method 2.3.25 rev C. It describes
how to make the conversions from resistivity to ug of Na/Cl equivalents /
sq. inch under section 4.4. You will need your supplier to provide you with
the calibration curve of the bridge probe they used on the day that the test
in question was performed. In addition, you will need the volume of
solution they used. Also, if you don't have this method you can find it for
free at IPC's website. Go to Knowledge, then Standards, then TM-650 test
methods download page, then section 2.3 chemical tests. I hope this helps.
Best Regards,
Joe Russeau
Precision Analytical Laboratory, Inc.
----- Original Message -----
From: "Graham Collins" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, February 19, 2008 12:35 PM
Subject: [TN] cleanliness testing
Hello TechNet
I'm in a debate with a supplier about the incoming cleanliness of one of
their parts, they claim it's squeaky clean and I claim it's as salty as a
bag of salt & vinegar potato chips. Obviously we are both exaggerating, but
one of us has a good claim.
They are fending me off with resistivity measurements made per the manual
test method IPC-TM-650 2.3.25 - which works in that I don't know how to
convert it to the "ug NaCl/in2" equivalent units I'm used to. Is there a
valid conversion?
Sir Doug of Dew, if you reply please do NOT say it depends...
regards,
Graham Collins
Halifax Production Engineering
L-3 communications Electronic Systems
(902) 873-2000 ext. 6215
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