A Method for Estimating the Frequency Stability of an Individual Oscillator

A method is given for estimating the intensity of random noise frequency modulation of an individual oscillator, using data obtained by comparing it with two or more other osci l la tors . This method is appropriate even if the oscillators available for comparison are less stable than the oscillator being evaluated, but their frequency fluctuations must be independent. The statistical uncertainty of the resul ts i s d iscussed briefly.