ABSTRACT
This chapter describes precision frequency meter for investigation and testing of laser and atomic frequency standards. Relevance of high-precision frequency measurements for different time intervals is a consequence of the need to develop a global satellite navigation system GLONASS, where high-precision measurements of distances require time or frequency standards of according precision. Certification of such standards requires precision frequency meters. The validation procedure uses two or more standard, and this frequency difference is formed by the heterodyne mixing which by mixing or directly is transferred to a carrier frequency, suciently stable for the subsequent measurement. The proposed frequency meter has increased the accuracy and dead time in that it is eliminated due to the continuous count of the counters, which determines the number of reference pulses during the measuring interval. The developed frequency meter is a valuable tool for research and certification of laser and atomic frequency standards.
