Messungen an elektromechanischen Wandlern

An apparatus for the continual registration of the frequency curves of electromechanical transducers is described, wherein the commonly found back-coupling onto the driving system is compensated by a control circuit. As examples, the frequency curves of a piezoelectric and an electrodynamic detector for vibrations of solids are given. In a gyratory “one-way-system” the relevance of the reciprocity principle is experimentally exemplified.