Test apparatus for determination of vibration characteristics of piezoelectric transducers

An AC generator may be connected to the signal leads of a piezoelectric transducer in order to induce mechanical vibrations in the transducer via the inverse piezoelectric effect. For determination of the vibration characteristics of the transducer provisions are made for a subtraction unit, whose one input is fed with the excitation signal of the AC generator while the other input is connected to the signal leads of the transducer. An evaluation unit is connected to the output of the subtraction unit; it displays and processes the measurement signal derived as the difference of the response signal of the transducer and a signal proportional to the excitation signal.