>
>Could someone settle a debate? What is the
>correct measurement of the total thickness
>of a multilayer board, glass to glass or
>copper to copper?
>
>thanks
>Mike Gnieski
>


Mike,

We define our pwb thicknesses as over all materials.  This includes copper,
plating, and solder mask.  Any material that would be subject to a vernier
during thickness inspection is considered.  This makes inspection a little
easier in most cases.  Since if solder mask is used it is often tough to
find an area of the board that is uncoated.  Likewise it is often difficult
to find areas of bare copper since all of our copper is solder coated.

Bill


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bill Dieffenbacher		   Tel. (607)770-2961
Lockheed Martin Control Systems	   Fax. (607)770-2056
600 Main St.  Room R52F            email [log in to unmask]
Johnson City, NY  13790
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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