Sean Thomas
     I agree with what you have said(I think). As I remember it, (it happened
with the first lvdt I constructed), The output was considerably reduced with my
configuration. As a consequence all the later versions I constructed with
isolated cores. Since the isolated core worked I left it at that. I make lvdts
with acrylic tubing. They have ~ 1/16 space around the core. My thought was if
the secondary coils were attached to ground at one end that providing a
ground(core) near the coils would drag the output down. Bwt now that I think of
it, how can the secondary coils be induced by the primary if the field is
grounded by the core? I have another one on the bench. I'll try a calibration
both ways.
Barry




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