IEC 60151-4:1963 pdf download 电子管和阀门电气特性的测量 - 第4部分：噪声系数的测量方法 Measurements of the electrical properties of electronic tubes and valves - Part 4: Methods of measuring noise factor

IEC 60151-4:1963 pdf download,Measurements of the electrical properties of electronic tubes and valves - Part 4: Methods of measuring noise factor
电子管和阀门电气特性的测量 - 第4部分：噪声系数的测量方法
This document is based on current practice on the measurement of noise factor.It should not be regarded as a recommendation in the sense of a standard because a more detailed description of the measuring methods is needed if measuring results on the basis of these principles have to be comparablewithin definite tolerances.
本文件基于噪声系数测量的现行实践。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范围内进行比较，则需要对测量方法进行更详细的描述。