Folks,

How does everyone out there measure over etch/over exposed?   Is the thickness more important than quality of solder mash between component lead spacing.

"X" 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Wednesday, June 23, 2010 11:36 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating measurment

Jean-Francois, et al, several years ago, I did a repeatability and reproducibility study of a micrometer, for measurement of conformal coating thickness. I found it to be an acceptable method for determining conformance to IPC A-610. For process control, I did attempt to judge.

For anyone who is interested, IPC has a nice test method for measurement quality:

http://www.ipc.org/4.0_Knowledge/4.1_Standards/test/1-_1-9.pdf

Associated with it in the test methods page is a spreadsheet calculator and user guide.

Louis Hart
Compunetics



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jean-François Bissonnette
Sent: Wednesday, June 23, 2010 11:52 AM
To: [log in to unmask]
Subject: [TN] Conformal Coating measurment

Hi Technetters,

 

What is the proper method for measuring conformal coating thickness?  Were're using a micrometer but I doubt that the method is reliable.  A wet gauge is not out of the question but we would prefer to measure thickness once the coating is cured.

 

Thanks!

 

Jean-François Bissonnette

[log in to unmask]

 

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