RLC measuring principle based on discrete spectrum analysis is proposed. RLC is abbreviations of resistance, inductance and capacitance. The value of complex impedance is obtained by gathering sinusoidal voltage and sinusoidal current flowing through impedance measuring synchronously and taking FFT to the signal gathered. By researching on the source of errors in RLC measurement based on the analysis of discrete spectrum, discrete spectrum correction technology which can reduce errors in RLC measurement is proposed. Discrete spectrum correction technology is made of frequency correction, amplitude correction and phase correction. The precision of RLC measuring instrument is improved greatly by using ratio formula correction method based on rectangular window.
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