Abstract: The values of resistance，capacitance and inductance are the key factors of the amplitude ratio and

waveform quality in the Fourier series decomposition experiment. Several experiments based on the three factors are

carried out in this paper. The results have shown that suitable value range of the resistance and strategy of dynamical adjusting of the capacitance is contributed to get good wave form quality and small deviation of amplitude ratio.

In addition，the experiment on inductance has verified that the greater its value is，the better the waveform is. In

conclusion，the above experiments can supply valuable reference to the experiment of Fourier series decomposition.

Key words: Fourier series, RLC series resonance circuit, waveform quality, amplitude ratio