IEC 60151-5:1964 pdf download 电子管和电子管的电气特性测量 - 第5部分：测量噪声和杂音的方法 Measurements of the electrical properties of electronic tubes and valves - Part 5: Methods of measuring hiss and hum

IEC 60151-5:1964 pdf download,Measurements of the electrical properties of electronic tubes and valves - Part 5: Methods of measuring hiss and hum.
电子管和电子管的电气特性测量 - 第5部分：测量噪声和杂音的方法
This document IEC 60151-5:1964 is based on current practice on the measurement of hiss and hum.It should not be regarded as a recommendation in the sense of a standard because a more detailed description ofthe measuring methods is needed if measuring results on the basis of these principles have to be comparable within definite tolerances.
本文件基于当前测量嘶嘶声和嗡嗡声的实践。不应将其视为标准意义上的建议，因为如果基于这些原则的测量结果必须在一定的公差内具有可比性，则需要对测量方法进行更详细的描述。