The most non-destructive way I know of getting that info is to call the fab house and have them give you a
microsection of the boards they did destuctive testing on. They should have done some microsectioning of
your boards before they shipped them to you. They should have tested for layer spacings, hole plating, and
possibly soldermask adhesion. I've had some success with this in the past.

Good luck,
Mitch Morey
San Diego,CA

CONKNET wrote:

> If you have a test instrument to measure capacitance between 2 conductors
> and know the dielectric constant of the material and the common surface
> areas between a conductor on L1 and L2, you can calculate the average space.
>
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Joy, Stephen C
> > Sent: Thursday, December 17, 1998 11:57 AM
> > To: [log in to unmask]
> > Subject: [TN] Dielectric Spacing Measurement
> >
> >
> >      Does anyone know of a non destructive way to measure the
> >      dielectric spacing between L1 and L2?
> >
> >      Thanks,
> >      Steve
> >
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