![]() ![]() supplying fheatitosthe crystal unit varies so that on plottingza temperature-frequency characteristic theplotrobtained will reflect the actual rate at which-,rthe temperature of the piezoelectric crystalbody-is: changing as well as the effect of the forces-imposed on the piezoelectriccrystal body duewto-the particular value of: the differential "crystal-body: tained': by a: clamping pressure, slipping is likely changes in dimensions of the piezoelectric crystal body and the mounting members. Thedifferential changes will vary as the rapidity of. In-such a case, the fi'owof heatxintozthecrystal unit will cause differential changes Lin dimensions of the mounting members with respect to the changes in the linear-dimen sions of the piezoelectric crystalbody. ![]() the point of attachment of the mountingmembers. This second kind of frequency instability is-also present when the clamping forces remain'rigid or fixed upon the surface of the piezoelectric crystal body and there is no slipping or-relative displacementat.
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