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Precision phase measurements are necessary in many sectors of the measuring equipment. The most important parameters of these devices: 1) carrier frequency range; 2) changing range of the measured phase difference; 3) the phase measurement error; 4) frequency range for phase increments. The paper discusses the opportunities and challenges for precise measurement of phase differences for these purposes.
The paper discusses the basic problems of frequency measuring and methods for improving the accuracy of these measurements. It reveals shortcomings of counting method and the advantages of the method of integral periods. Also it discusses the division of frequency measurement between standard and unique devices for these purposes.
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