The admittance circle diagram is an important method of characterising the terminal response and, thus, the electrical equivalent circuit of acoustic transducers. Equipment to yield such plots is relatively costly and consequently less readily available than might be desired. This paper describes a method of obtaining admittance plots, typically to frequencies of the order of a few megahertz, which involves only modest circuit development. The method avoids circuit design complexity by relying upon the computing power of any readily available microcomputer to effect correction of parameter cross-coupling.
