We've had good luck with a CMI model CGX-B on dry coating.  The unit should
be returned to the factory for recalibration on a yearly basis. I believe it
is an eddy current measurement device and measurements must be made over
copper.  I use a half inch square of FR-4 for standardization and
measurement after selective coating and drying.  It helps if the design
leaves a small bare copper area in the border.  Repeatability is +,- 0.1
mil.

-----Original Message-----
From: Collins Graham [mailto:[log in to unmask]]
Sent: Tuesday, September 16, 2003 3:02 PM
To: [log in to unmask]
Subject: [TN] measuring the thickness of cured conformal coating


Hello TechNet!
I've got a question for the conformal coaters out there.

Our situation:  We currently measure CCA thickness before application,
and then again after application & cure of conformal coating, to
determine how thick a coating we have applied.  We are currently using a
micrometer to measure the thickness.  Our coating thickness is in the
0.001" to 0.005" range.

My question is: what are others using to do this sort of measurement?
Are there are better tools out there to do this faster / better?

Thanks!

regards,

Graham Collins
Process Engineer,
Northrop Grumman Canada Corporation
Halifax
(902) 873-2000 ext 6215

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