Conclusions
Among the examined methods for raising the operating speed of digital frequency-measuring devices, the most effective ones are based on a preliminary multiplication of the frequency, or on the measurement of its period. However, the narrow frequency range and low operating speed of the former, and the complicated equipment of the latter indicate the necessity of a further development of these methods. According to the recommendations provided above it seems advisable to use proportional-integral control in tracking multipliers and pulse simulation in devices for evaluating frequency by its period.
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Shakhov, É.K. Methods for raising the speed of digital frequency-measuring devices. Meas Tech 9, 725–728 (1966). https://doi.org/10.1007/BF00996024
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DOI: https://doi.org/10.1007/BF00996024