SU387299A1 - DIGITAL METHOD FOR MEASURING THE RELATIONSHIP OF TWO FREQUENCIES FOR FOLLOWING THE PULSES - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used to expand the range of: measurable ratios, to exclude the operation & calculation of the acceleration of the measurement process.

The known digital method of measuring the ratio of two pulse frequency, based on determining the ratio of the lower frequency iK of the frequency difference 1, by counting the number of pulses of lower frequency in a time interval equal to the period of the difference frequency, is characterized by a narrowed range of measured ratios, the necessity of the calculation operation and the reduced speed of the measurement process .

According to the proposed method, an integer division factor of a higher frequency is determined, at which the ratio of the frequencies is minimal, the magnitude of the ratio of the lower frequency to the difference divided | is measured; ; frequencies and lower frequencies and sum the number of pulses equal to the integer division factor multiplied by 10 with the same number divided by the measured ratio value.

The method allows to expand the range of measurable ratios, eliminate the calculation operation and speed up the measurement process.

It is realized in the following way: in the image.

By roughly measuring the ratio of the two frequencies, an integer coefficient K is determined, into which the larger frequency FZ should be divided, so that the ratio of the divided higher frequency F to the lower frequency Fi lies within 1-2. The measurement accuracy increases as the value of this ratio approaches 1. Then the value of

FI t;:. After that, to the decimal account / 2-t-i

A tick to the digital indicators is fed a sequence of / C-10 IAchpulses directly and the same sequence through a divisor of the number of pulses with a division factor equal to m.

The total number of pulses entering the counter is equal to

.

The calculus, which determines the integer part of the ratio from the fractional, is permanently indicated between the i1 of the Dicator of the M | H-th and (/ g +, 1) -th bits.

Subject invention

A digital method for measuring the ratio of two pulse frequency frequencies based on determining the ratio of lower frequency to frequency difference by counting the number of pulses of lower frequency in a time interval equal to the difference frequency period, characterized in that in order to expand the range of measured ratios and terminations the steps of calculating and accelerating the measurement process, are 5, determine the integer division ratio of the higher frequency, at which the ratio of the frequencies is the smallest of the magnitudes greater than one, is measured in The ratio of the smaller frequency to the difference of the divided higher frequency and the lower frequency is the sum of the number of pulses equal to the integer division factor multiplied by 10 with the same number divided by the measured ratio value.