To obtain the electromechanical match at resonant frequencies for piezoelectric actuating applications, the impedance or admittance characteristics of a piezoelectric vibrator must be measured by a spectram analyzer. In this paper, the admittance analyzer has been developed using an integration technique with a GPIB card, a data acquisition card and software Lab VIEW tools. Based on the five built-in models of equivalent circuits as the basic evaluating functions in a HP-4194A impedance analyzer, the most suitable model has been identified to demonstrate the electromechanical features of a piezoelectric vibrator. The measured results from the admittance analyzer and actual data from an HP-4194A analyzer are compared to evaluate the performance of the admittance analyzer. The analyzer offers the complete functions of a hardware instrument for measuring admittance based on theory and experiments within the 120 kHz range.
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