Multiplied Frequency Measuring System

Abstract

The article describes a functional diagram of a multiplied measuring system for simultaneous frequency measurement in n channels. The measuring system implements three methods of frequency measurement: the first method is to measure the frequency over an integer number of periods of the measured frequency, the second is to measure the frequency over an integer number of periods of the reference frequency, and the third is the coincidence method. The use of such a solution makes it possible to minimize the frequency measurement time and ensure a given level of sampling error. The time graphs of frequency measurement by the coincidence method obtained by statistical modeling using four pulse duty cycles are given. An expression is shown for determining the values of the pulse duty cycle, at which the shortest frequency measurement time is achieved by the coincidence method. A probabilistic estimation of the frequency measurement time by the coincidence method and a probabilistic estimation of the range of measured frequencies, in which the frequency measurement by the coincidence method is performed faster than the first two methods, are presented.