Abstract
THE metering system commonly used in radio noise meters includes a special type of voltmeter, the development of which is one of the steps leading toward practical instruments for evaluating the influence of electric power apparatus on radio reception. Early developments in this field were introduced through the efforts of groups representing the electric-apparatus manufacturers, power companies, radio apparatus manufacturers and services. Radio noise meters and test methods have been gradually improved as a result of experience, and progress reported from time to time. General features of radio noise meters and test methods were discussed in 1943.1 The over-all performance of a representative type of noise meter, using square wave input voltage to simulate noise, was analyzed in 1945.2 Several meter circuits of the type applied to radio noise meters are analyzed in this paper.
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