Description: Uncertainty of a high-precision method of measurement of single time intervals with use of difference-periodic measure are investigated. The equation describing process of transformation of single time intervals in a code is considered, the methodical error caused by value of difference-periodic measure is defined. The analysis of errors of tool character allows to find optimum value of differential frequency. The total law of distribution of errors and their uncertainties are estimated.
Keywords: difference-periodic measure, a single time interval, uncertainty of measurement, an error, measurement, a method оf package coincidence