SU748270A1

SU748270A1 - Digital meter of deviation of frequency from rating

Info

Publication number: SU748270A1
Application number: SU762425362A
Authority: SU
Inventors: Роман Антонович Воробель; Валерий Богданович Дудыкевич; Тарас Григорьевич Галамай; Инна Игнатьевна Уланова
Original assignee: Предприятие П/Я В-8751
Priority date: 1976-12-01
Filing date: 1976-12-01
Publication date: 1980-07-15

Description

(54) ЦИФРОВОЙ ИЗМЕРИТЕЛЬ ОТКЛОНЕНИЯ(54) DIFFERENT DIFFUSION METER

ИЗМЕРЯЕМОЙ ЧАСТОТЫ ОТ НОМИНАЛЬНОЙMEASURED FREQUENCY FROM NOMINAL

1one

Изобретение относитс к электроизмерительной технике.This invention relates to electrical measuring technology.

Известен цифровой измеритель отклрнени измер емой частоты от номинальной , содержащий формирователь импульсов, ключи, генератор образцовой частоты, счетчик импульсов, схема совпадени ,интегратор с последовательным переносом,схемы сравнени кодов и р д других вспомогательных элементов 1 . Это устройство характеризуетс низким быстродействием и чрезмерно сложно. Кроме того, данное устройство не обеспечивает возможности работы в след щем режиме ,A digital deviation meter of the measured frequency from the nominal one is known, comprising a pulse shaper, keys, an exemplary frequency generator, a pulse counter, a coincidence circuit, a sequential transfer integrator, a code comparison circuit, and a number of other auxiliary elements 1. This device is slow and overly complicated. In addition, this device does not provide the possibility of operating in the following mode,

Наиболее близким по технической сущности к изобретению вл етс .измеритель отклонени средней частоты импульсного потока, содержащий формирователь импульсов, ключ, формирователь интервалов времени, генератор образцовой частоты, счетчик импульсов, блок управлени , схему . инверсии индикации и блок индикации 2J .The closest to the technical essence of the invention is a measuring device of a deviation of the average frequency of a pulsed flow, comprising a pulse shaper, a key, a time interval shaper, an exemplary frequency generator, a pulse counter, a control unit, a circuit. display inversion and display unit 2J.

Однако это устройство также характеризуетс невысоким быстродействием и, кроме того, не обеспечивает непрерывной индикации результата измерений.However, this device is also characterized by low speed and, moreover, does not provide continuous indication of the measurement result.

Цель изобретени - .повышение быстродействи устройства.The purpose of the invention is to increase the speed of the device.

5 Это достигаетс тем, что в цифровой измеритель отклонени измер емой частоты от номинальной, содержащий блок управлени , первый и второй входы которого подключены к первым5 This is achieved by the fact that in a digital meter the deviation of the measured frequency from the nominal one, containing a control unit, the first and second inputs of which are connected to the first

О выходам реверсивного счетчика, вторые выходы которого соединены с первь1ми входами блока элементов совпадений, вторые входы которого подключены к выходам счетчика импульсов,About the outputs of the reversible counter, the second outputs of which are connected to the first inputs of the block of elements of coincidence, the second inputs of which are connected to the outputs of the pulse counter,

15 введен блок сложени -вычитани , вход которого подключен к .выходу блока элементов совпадений, выходы подключены к третьему и четвертому входам блока управлени , выход которого15, an addition-subtraction unit is inputted, the input of which is connected to the output of the block of elements of coincidence, the outputs are connected to the third and fourth inputs of the control unit, the output of which

20 соединен с вычитающим входом ревер- сивного счетчика и с входом счет-. чика импульсов.20 is connected to the subtractive input of the reversing counter and to the input of the counter-. pulse impulses.

На чертеже представлена структурна схема цифрового измерител .The drawing shows a block diagram of a digital meter.

25 Он содержит реверсивный счетчик 1, блок 2 элементов совпадений., счетчик 3 импульсов, блок 4 сложени вычитани и блок 5 управлени .25 It contains a reversible counter 1, a block of 2 coincidence elements, a counter of 3 pulses, a block 4 of subtraction and a block 5 of control.

Блок 4 сложени -вычитани состоитBlock 4 add-reading consists of

Claims

30 of the add-on circuit on the OR element and the delay element and the frequency extraction circuit on the trigger and the AND element, and the control unit 5, consists of the trigger and switches on the two coincidence elements and the IL element. The device operates as follows. In the initial state, the bits of the reverse counter 1 are in zero states, and block 4 is in the addition mode of the input clock, i.e. the output frequency of counter 3 is equal to ff + f - (1 2 X 1 where fy is the measured frequency; f is the pulse frequency at the output of counter 3 is equal to Р Zr. П I. (2 where Z is the number contained in ; 1; N is the conversion factor of counters 1 and 3. From expressions (1) and (2) we get f JJt-N (3 In steady-state mode at equal frequencies and incoming to the inputs of counter 1 frequency fc. -Nm / ff Nm-Z, from where fo where Af is the deviation of the measured frequency from the nominal one. The result, defined by expressions (5) and (6), will be obtained at about x If fj (fQ / then the pulse frequency at the input does not count 1 is equal to the sum and, moreover, exceeds fo.Therefore, the number in counter 1 decreases. The signal from one of the bits of dBv of counter 1, indicating a decrease in the number Z, goes to block 5, which at the same time transforms block 4 from addition mode to subtraction mode. Then .. (7) From equations (2) -and (7) we get -N. g N, in the steady state, from where In both cases, the number 2 in the reversible counter 1 will indicate the relative deviation value of the measured frequency from nominal. If fp 7 fy, then the pulse repetition rate at the input of the subtraction i of counter 1. is equal to the difference fx and f, and the more so the smaller fo. Therefore, the number in. counter 1 is growing. The signal from one of the bits of counter 1, indicating an increase in the number Z, enters block 5, which in this case transfers block 4 from the subtraction mode to the addition mode. In the steady state, the number Z in counter 1 will be 5. If the frequencies f and f do not change, in the steady state the number Z is constant: If one of the frequencies changes, then only this increment is measured, and Z is incremented AZ. This increment measurement requires much less time than the time of one clock cycle in known devices. Due to the fact that the Z number monitors the change in the deviation of f from f (y, in the proposed device, continuous reading and indication of the measurement result can be carried out. The invention The digital meter, the deviation of the measured frequency from the nominal, containing a control unit, the first and second inputs of which connected to the first outputs of the reversible counter, the second outputs of which are connected to the primary. inputs of the block of elements of coincidence, the second inputs of which are connected to the outputs of the pulse counter, different to. , in order to improve speed, an addition-subtraction unit was entered into it, the input of which is connected to the output of the coincidence cell, and the outputs are connected to the third and fourth to the inputs of the control unit whose output is connected to the subtracting input of the reversible counter and to the input of the counter impulse. Sources of information taken into account in the examination 1. The author's certificate of the USSR No. 300833, class G 01 R 17/00, 1969.

2. USSR author's certificate number 324586 cl. G 01 R 23/10, 1969.

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