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December 2008

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Subject:
From:
Ted Tontis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ted Tontis <[log in to unmask]>
Date:
Thu, 4 Dec 2008 13:27:41 -0600
Content-Type:
text/plain
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text/plain (60 lines)
Doug,
	We are currently using the eddy current method to measure our
conformal coating thickness. Recently we had some issues where one operator
was making adjustments to the coating thickness every time they measured the
thickness coupon. After a shift change the operators would run another
coupon through only to find that the coating was thicker then needed and
would change the settings back. What we found out was that the operators
were using varying amounts of pressure changing the readings on the meter
giving us measurements that were not in control. We now have an automated
system that applies the correct amount of pressure continually providing us
with more accurate readings.  

Regards,

Ted T 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Thursday, December 04, 2008 1:19 PM
To: [log in to unmask]
Subject: [TN] Conformal Coat and Eddy Currents

Good afternoon all,

A question for this most excellent forum.  Does anyone here use eddy 
current methods to measure applied coating thickness on printed circuit 
assemblies?  If so, can you share your opinions on the methods and the 
equipment?

There are testers on the market that do this and one of our design 
engineers is currently suprised at how we are using "stone age" 
technologies (micrometer) to measure coating thickness. 

Doug Pauls
Rockwell Collins

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