I'm seeing variations of up to 60% in capacitance between signal traces
and ground plane on a stripline PWB; trace widths appear to be
consistent among PWB's . Can these diffferences be attributed to
variations in the dielectric constant of the FR4 material?

Is there a method to check board layer thickness without actually
sectioninng, and destroying, the PWB's?

Any help would be greatly appreciated.

Joe Barocio
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