用数字毫伏表测量RLC串联电路相频特性

Measurement of the Phase-frequency Characteristic of RLC Series Circuit by Using a Digital Millivoltmeter

在论述RLC串联谐振电路和并联谐振电路原理的基础上,提出用数字毫伏表测量RLC串联谐振电路相频特性曲线的方法,并将测量结果与传统示波器测量方法比较,分析误差产生的原因是由于电感器交流内阻的影响所致。

A novel method is established to measure the phase-frequency characteristic curve of RLC series resonance circuit by a digital millivoltmeter,based on the principles of RLC series and parallel resonance circuits. Data show that the recorded curve of RLC are much better by using this new method,compared with those measured by the traditional method with an oscillograph. We also demonstrate that the AC impedance of the inductance is a major reason for producing error.