| http://www.w3.org/ns/prov#value | - The exciter force fexc can, as usual for measuring transducers of such type, be developed bidirectionally or unidirectionally and, in the manner known to those skilled in the art, be tuned e.g. by means of a current and/or voltage control circuit with respect to its amplitude and e.g. by means of a phase locked loop with respect to its frequency.
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