I believe the only accurate method would be to micro section and measure it.

You need to be aware geographically on the board of where the problem is
occurring and section those areas since the resist thickness will vary
depending on a number of factors which are:

1	Was it curtain coated or screened on?

2	The resist will be thicker in the middle of a trace and thinner at
the edges

My suggestion would be to look at the impacted areas and then section across
the traces to be able to measure the thickness difference between middle and
trace edge.

Just as well we are over half way through the week..............sorry you
are having, problems.

John

 
 
John Burke
 
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hogg, Blair K.
Sent: Thursday, July 05, 2007 8:37 AM
To: [log in to unmask]
Subject: [TN] Soldermask Thickness

We switched PC board suppliers for one of our products a while back and
have started having hipot issues with components that are connected to
main 110VAC input voltage arcing through the soldermask to tracks
underneath at 1200V hipot voltage. 

I'm pretty sure I'll get a few responses that say that we shouldn't be
using the soldermask as an insulator, however, since the change in
supplier seems to coincide with the onset of problems, I've been asked
to evaluate the soldermask thickness as a potential contributor to the
problems. 

I would some recommendations on how to measure the thickness of the
soldermask. 

Thanks,

Blair

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