任意高频信号真有效值测量技术

针对传统测量方法和测量仪器无法准确测量失真正弦波或非正弦信号有效值的问题,提出利用美国AD公司的真有效值检测单块集成电路AD536A测量任意高频信号真有效值的方法。从理论上说明平均值测量法测量的有效值与真有效值的区别,分析了当前有效值测量方法的缺点,设计了真有效值检测电路。实验表明,该测量方法和检测电路能实现对任意高频信号真有效值的测量。

Measure techniques for the true RMS of any high frequency signal

Traditional methods and instruments are not able to measure the true Root Mean Square（RMS） of distortion sine wave or non-sine signal accurately.This article introduces a method to measure the true RMS of any high frequency signal by using the true RMS measurement IC,AD536A,designed by AD corporation.The paper analyses the difference between the RMS measured by the average measure method and the true RMS in theory.It explains the disadvantages of current RMS measure method,and presents the design of true RMS measure circuit.The experiment results prove that the proposed method and circuit can measure the true RMS of any high frequency signal accurately.