Thanks Joe, I was looking at an older revision in the back of a
J-STD-001 book - I should have checked the latest and greatest. My
bad!!! Send Dewey over to whip me with a wet noodle - he seems to be
fixated on pasta today.
regards,
- Graham
-----Original Message-----
From: Joe Russeau [mailto:[log in to unmask]]
Sent: Tuesday, February 19, 2008 2:08 PM
To: TechNet E-Mail Forum; Collins, Graham (FN) @ ESI
Subject: Re: [TN] cleanliness testing
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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