SU398879A1 - INTEREST FREQUENCY - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment.

The known percentage frequency meters containing the input transducer, the formers of the periods of the measured and nominal frequencies, the generator of the reference frequency, the comparison and collection circuits, and the pulse counter have low speed and the presence of a methodological measurement error.

The aim of the invention is to increase the speed and eliminate the methodological error of frequency measurement.

This is achieved by the fact that the proposed frequency meter is equipped with a pulse adder, a compactor, even periods nominal and measured frequency shapers and even periods comparison circuit, the inputs of which are connected to the outputs of even periods shapers, the inputs of which are connected respectively to the shaper outputs of odd periods of the measured frequency and generator of exemplary frequency, and the output of the said comparison circuit through the collection circuit and the adder, shunted by a multiplier, is connected to the input of the counter.

The drawing shows a block diagram of the described frequency meter containing the input converter 1, shapers 2 and 3 of odd and even periods of the measured frequency, respectively, of circuit 4 and 5 of the comparison

2

periods of nominal and measurable frequencies, each of which may contain, for example, two keys and a trigger for fixing the deviation sign, an exemplary frequency generator 6, a driver 7 of odd periods of nominal frequency, including a key 8, a frequency divider 9 with a constant division factor (double or decimal) and trigger 10, driver

11 even periods of the nominal frequency, the circuit is assembled 12, the adder 13 pulses, the multiplier 14 of two sequences of pulses and the counter 15 pulses.

Frequency meter works as follows.

In the initial state, the comparison circuits 4 and 5 and the key 8 are closed, the divisor 9, the multiplier 14 and the counter 15 are in zero states. With the arrival of measured frequency pulses

from the input converter 1 to the shaper 2 of odd periods, the initial state of the latter changes to the opposite, the initial state of the shaper 3 is confirmed and the shaper 7 is started, re-flashing trigger 10 and opening the key 8, through which the pulses of the reference frequency from the generator output go to the divider 9 frequencies. As a result of these operations, the synchronous formation of the odd

the period of the measured frequency and the odd non-period of the nominal frequency, which for the period of the measured frequency ends with the arrival of the second (counting) pulse from the input transducer 1, and for the period of the nominal frequency by the overflow signal of the divider 9, flashing the trigger 10 and closing key 8.

The comparison circuit of odd periods fixes the sign of the difference between the nominal and measured periods and allocates a time interval; equal to their difference, during which the pulses of the exemplary frequency from the generator arrive at the input of the collection circuit 12, forming the main sequence at the first inputs of the adder 13 and multiplier 14. In accordance with the deviation sign fixed by the comparison circuit 4, in the adder 13 either each corrective the pulse from the output of the multiplier 14 into the main pulse train (with a positive deviation), or by subtracting one correction pulse with each corrective pulse (with a denial of Yelnia matter).

When the formation of the largest of the compared periods is completed, the measurement result is output to the counters 15 and the multiplier 14 and counter 15 are returned to the initial state.

The second (counting) pulse from the input converter I sets the shaper 2 to the initial state, changes the initial state of the shaper of even periods of the measured frequency to the opposite one and starts the shaper of even devices of the nominal frequency 11. The comparison circuit 5 confirms the sign of the deviation obtained in the previous measurement or reverses it. At the same time, the main sequence of pulses from the output of the comparison circuit 5 is fed to the input of the collection circuit 12. The adder 13 and the multiplier 14 perform similar operations with the first ones.

With the arrival of the third (counting) and subsequent pulses from the input transducer 1, the operation of the entire device is repeated, ensuring the delivery of the measurement result in each period of the measured frequency.

The time-separated formation of the main pulse sequences from the outputs of the comparison circuits 4 and 5 allows one multiplier and one pulse adder to be used to correct them.

Subject invention

Percentage frequency meter containing serially connected input transducer and shaper of odd periods of measured frequency, generator of exemplary frequency, to the output of which serially connected shaper of odd periods of nominal frequency and

A comparison circuit, the output of which is connected to the input of the collection circuit, and a counter, characterized in that, in order to improve speed and eliminate the methodological measurement error, it is equipped with an adder, a sealant, shapers of even periods of nominal and measured frequencies and a comparison circuit of even periods, the inputs of which are connected to the outputs of the drivers of even periods, the inputs of which are connected

respectively, with the outputs of the odd-period generator of the measured frequency and the generator of the reference frequency, and the output of the said comparison circuit through the collector circuit and the adder, shunted by a multiplier,

connected to the input of the counter.