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The standard method to determine physical parameters of piezoceramics, established by IEEE, has been utilized for decades by the number of researchers, yet it omits presence of important loss factors and possesses serious deficits that restricts accurate parameter determination. In order to resolve these issues, the partial electrode (PE) method (mechanical excitation method) was previously proposed. In this study, we aim to propose a modified PE method to enhance the efficiency of parameter determination process, along with a simplified analytical admittance equation for better understanding of the PE configuration. To prove that the PE method is reliable, possible causes of errors were listed, and it was shown that they were either negligibly small or resolved with proper calibration methods. Throughout the paper, it was validated that the PE method not only reduces the errors of several physical parameters by avoiding error propagation, but also enables measurement compatibility with commercially available impedance analyzers.