Put a copper square on the breakaway area and use an eddy current meter (or
similar device). It measures the distance between a contact probe and the
metal plate. It works great for conformal coating.

Other methods include ultrasound, and other electrical functions.

ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 7/22/98 6:07 PM:
To: Aric Parr@01635@Lectron_RH,
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG]

How about some type of laser inspection system?  We have a small
Cyberoptics system (www.cyberoptics.com, 800-746-6315) that we use to
measure the
thickness of thick film paste ans solder maks before and after it is
fired.  I believe that it has an accuracy of roughly 0.1 mils, and is
probably not that expensive.

Brett Goldstein
EVI, Inc.



> Date:          Wed, 22 Jul 1998 11:19:30 -0400
> From:          "Blanchet, Richard" <[log in to unmask]>
> Subject:       Fab : Solder mask thickness

> Hello all,
>
> Is there a non destructive way to measure solder mask thickness with
> precision, wet or dry ?  Thanks.
>
> Richard Blanchet
> Process Engineer, screening
> Viasystems Canada Inc.
> tel.: (514) 694-8900, ext. 4189
> fax: (514) 694-9776
> [log in to unmask]
>
>

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