利用平均值电压表测量放大器的噪声

Measuring the Noise of Amplifier with Mean Voltmeter

噪声是一个随机信号 ,其电压波形是没有规律的非正弦波。由于无法描述噪声电压的时间波形 ,从测量的角度看 ,对噪声电压的测量一般用有效值电压表直接进行。本文根据噪声可以用统计学的方法描述其特性 ,噪声电压的分布规律符合正态分布的特点 。

Following the theory that the features of noise can be described with the method of statistics、the distribution rule of noise voltage agrees with the characteristics of normal distribution and by considering the relation between probability consistency function and the scales of mean voltmeter, a common usage of the mean voltmeter used in the lab is introduced to measure the noise of amplifier, the points for attention and the steps of operation in the process of the measurement are also given out in this paper.