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Laboratory experiments were developed for measuring the frequency characteristics of operational amplifier circuits using a personal computer with a data acquisition unit. A periodic rectangular wave, which is easily generated by a DA (digital/analog) converter, is applied to the circuit: then the steady-state response is digitized by an AD converter. Filon's method was used for the numerical Fourier integration of the sampled response. The errors associated with the measurement of the frequency characteristics of an integrator were found to be less than 0.2 dB and 1 degrees in gain and phase, respectively, within the frequency range satisfying the condition that the gain be >or=0 dB.