PROBLEM TO BE SOLVED: To provide a measuring apparatus for deriving the common mode equivalent circuit of a communication equipment capable of narrowing a measurement point interval by one figure or more, as compared with a conventional one.;SOLUTION: Instructions to perform remeasurement of the impedance between two terminals in detail out of the three terminals of the generator terminal, battery terminal, and grounding terminal of the communication equipment, narrowing the frequency range of measurement to the vicinity of the minimum point or maximum point in the change of the impedance between the two terminals with respect to frequency, are given, measured values of the impedance between the terminals are converted into the respective impedance values of a T circuit network when the communication equipment is assumed to be a T circuit network, converted into the respective admittance values, and its peak point is searched for. Based on the frequency and admittance values of the peak point, a series resonance circuit is assumed, resonance circuit constants are computed, instructions to search for the next peak point is given, the computed circuit constants are composed into a parallel circuit by mode composition, and a common mode equivalent circuit of the communication equipment is displayed.;COPYRIGHT: (C)2005,JPO&NCIPI
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