SU370538A1 - DIGITAL METHOD OF MEASURING THE FREQUENCY OF FOLLOWING - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment and can be used to expand the range of measured frequencies and improve accuracy in digital frequency measurement.

The known digital method of measuring the pulse frequency, based on counting the number of pulses of the measured frequency during the reference time interval and taking into account the gap between the last recorded pulse of the measured frequency and the end of the reference time interval, is characterized by a narrow range of measured frequencies and reduced accuracy.

The proposed method differs from the known ones in that in the time interval between the pulse of the measured frequency, coinciding with the beginning of the reference time interval, and the first pulse recorded during the calculation of the main part of the measurement result, the measured frequency is multiplied by a constant factor, then the number of pulses multiplied is calculated frequency during the time interval between the last registered pulse of the measured frequency and the end of the reference time interval.

The method allows to expand the range of measured frequencies and improve accuracy in digital frequency measurement.

The method is as follows. The frequency of the periodic pulses is measured by counting them over a reference time interval / f, the beginning of which is synchronized with the beginning of the period Tx of the measured frequency fx. The number of NX pulses of the measured frequency found in this way constitutes the main part of the measurement result. To get the value directly in

units of frequency, choose the reference interval / f equal to L ™, where A is the base of the adopted number system, and t is the natural number.

Then, during the interval A / between the last registered pulse of the measured frequency and the end of the reference interval, the number ANx, the pulses of the frequency d / s :. AL number: represents an amendment to the main part of the measurement result. This correction is expressed directly in terms of frequency, if you choose k to be equal to A, where A is the base of the received reading system, and e is a positive integer that determines the number of additional

significant figures of the measurement result.

Subject invention

A digital method for measuring the pulse frequency based on counting the number of pulses of the measured frequency during the reference time interval and taking into account the interval between the last recorded pulse of the measured frequency and the end of the reference time interval, characterized in and increase accuracy, in the time interval between the pulse of the measured frequency, which coincides with the beginning of the reference 4 time interval, and the first pulse, recorded during the calculation of the main The second part of the measurement result multiplies the measured frequency by a constant factor, then the number of multiplied frequency pulses is counted during the time interval between the last recorded pulse of the measured frequency and the end of the reference time interval.