信号发生器输出幅度对RLC串联谐振电路特性的影响

The influence of the output amplitude of the signal generator on the characteristics of the RLC series resonant circuit

通过实验研究了信号发生器输出幅度对RLC串联谐振电路的谐振频率、电感线圈的等效电阻及品质因数等的影响。在RLC串联谐振电路中,保持电阻R、电容C、电感L不变,改变正弦信号发生器输出电压幅度,研究谐振电路的特性。结果表明,信号发生器输出电压的幅度越小,测量得到的谐振频率更接近理论值,随着信号发生器输出电压幅度的增大,电感线圈的等效电阻在增大,谐振电路的品质因数在减小,通频带宽度没有变化。

The influence of the output amplitude of the signal generator on the quality factor,the equivalent resistance of inductance coil and resonant frequency of RLC series resonant circuit are studied using experimental method. In RLC series resonant circuit,the output voltage amplitude of sinusoidal signal generator is changed and the resistance R,capacitance C and inductance L are kept unchanged to study the characteristics of resonant circuit. The results show that the smaller the amplitude of the output voltage of the signal generator,the closer the measured resonant frequency is to the theoretical value. With the increase of the output voltage amplitude of the signal generator,the equivalent resistance of the inductance coil is increasing,the quality factor of the resonant circuit is decreasing,and the passband width remains unchanged.