SU759966A1 - Digital device for measuring complex values - Google Patents

Description

The invention relates to a measuring technique and can be used in digital devices for measuring the amplitude and phase of an alternating electric voltage, and also, in the case of induction type vibration sensor switching on at its input, in digital vibration analyzers for measuring the module and phase of harmonic components of vibration,

Known measuring transducer AC voltage, containing the Converter, "voltage", selector, control circuit reverse, reversible counter and '·>

control device [ΐ].

The disadvantage of the device is. in low selectivity with respect to the higher harmonics of the input signal and the absence of a direct * reference of the amplitude and phase of the measured value.

A digital device for measuring complex values is known, containing a voltage-to-frequency converter, the output of which is connected through three elements AND to the inputs of the “add” and “subtract” reversible meters connected to the reading device.

2

The amplitude and through the fourth and fifth elements And with the inputs "add" and "subtract" reversible counter - the second inputs of the cells of three elements And connected to the outputs of the code converter, the inputs of which are connected to the outputs of the counter and inputs of the phase reading device [2].

However, the device has a low speed,

The purpose of the invention is to increase speed.

This goal is achieved by the fact that a digital device for measuring complex values, containing a voltage-frequency converter, the output of which is connected to the first input of the first element I, the second input of which is connected to the first output of the control unit, the second output of which is connected to the K-inputs the first and second reversible counters, and the input of the control unit is connected to the input of the frequency multiplier and the K-input of the counter, the output of the frequency multiplier is connected to the input of the counter, the outputs of which are connected via a converter code with the first inputs of the second, third, fourth and

759966

the fifth And elements, the second inputs of which are connected to the output of the first element And, and the outputs are connected to the first inputs of four OR elements, the outputs of which are connected to the inputs of two reversible counters, direct outputs. The first reversible counter is connected to the inputs of the amplitude reading device, the phase reading device, A trigger, a pulse generator, two code-to-frequency converters, a phase counter, an additional element, And, the second output of the control unit is connected to the K-input of the counter. Phase, the outputs of which are connected with the inputs of the phase reading device, and the input is connected to

the output of the pulse generator AND the frequency. inputs of two code-to-frequency converters, the input of the pulse generator is connected to the trigger output, 1-input of which is connected to the first 20 output of the control unit, and the A-input is connected to the output of an additional element I, whose inputs are connected to the output "plus" the first reversible counter and with inverse output-. 25 minutes of the second reversing counter, forward and inverse outputs, outputs "plus." and "minus" of two ^- reversible counters are connected to the corresponding inputs of code converters ·} θ В_frequency, the first output of the first code to frequency converter is connected / Respectively to the second input of the first OR element, the second output is connected to the first output of the second code to frequency converter , the second inputs of the second and third OR elements, and the second Output of the second code-to-frequency converter is connected to the second input of the fourth OR element. 40

The drawing shows "structural. Electrical circuit of the device.

The device contains a voltage-frequency converter 1, elements 2,3,

4 And, reversible counter 5, reading device 6 amplitude, elements 7.8 And, reversing counter 9, converter 10 codes, counter 11, reading device 12 phase, multiplier 13 'Frequencies, control unit 14, elements 15,16,17, 18 OR, converters 19, '

20 codes per frequency, 21 phase counter, 22 pulse generator, 23 I element, trigger 24. -.-

The operation of the device proceeds in two stages. 55

The first step is to determine the components of the vector of the measured voltage in rectangular coordinates. For this purpose, the cell of element 2i opens with a signal from block 14 for one 60 periodoporn signal. Since the counter 11 is set to "O" directly by the reference signal, the condition I} * 0 is constantly fulfilled, and therefore in the counters 5 and 9 after 65

a period affect recorded numbers

^M ao ^Z x "^ b _o ' N where _A - the number corresponding to the amplitude of the input signal; - the angle between the managers • signals on the elements of ZI and 4I and the reference voltage I * - the angle between the reference and input- nym voltage. Index "0" means that these numbers

are the source for the second stage of the proposed device.

The second stage - the transformation of coordinates - begins immediately at the end of the period of the reference signal, spent on the first stage: the back

the front of the signal controlling element 2I is set to "1" trigger 24, in turn, the trigger generator 22 (until this moment, generator 22 is off and has no effect on the measurement process of% o ^and _{o o} ).

If by chance it turns out to be 1 _x = 0, then element 23 also generates a signal at potential input K _ trigger 24 ·, which does not allow to set it to "1", and coordinate transformation does not occur, and the result turns out to be correct, since in the reversible counter 5 at the same time Ν _αο = N _А , and in the counter 21 - zero.

If 0, then when you turn on the generator 22 at the outputs of the converters 19,20 appear respectively frequency

and the states of counters 5 and 9 begin to change in accordance with the controls (in continuous approximation)

*

O o o ⁰

where Ν _ο is the invoice module;

- reference frequency;

N {3 - the number accumulated in the reversible counter 9l

These equations describe a lossless oscillatory link, with its own circular frequency of the ith ₀ = D ₀ / M ₀

This link moves in accordance with the equations in such a way that the end of the vector, the projections of which are the numbers Ν _α ' ^Ν Ь> rotating with the angular velocity ίϊθ rad / s, describes a circle of radius М _А => / ν £ + The current angle of rotation of the vector from the original positions are indicated by a number in the counter 21- When the vector Ν _α passes the position at which Ν |, “°> a Ν _β > 0, element 23I is triggered, turns off“ with the help of a trigger 24, generator 22 stops. motion of an oscillating star model5

on. In this case, in the reverse counter 5, the number MD appears, and in the counter 21, the number = = Ν _ο <ρ _χ .

Since the number of ^ th Ν _{ο is} usually

not less than 10-10 *, the phase sensitivity is high enough and allows, if necessary, to get a readout and in degrees ..

The coordinate conversion time is hundredths and thousandths of the period of the input signal, and the total measurement time is practically determined by the first stage, which takes the signal period.

Claims (1)

Claim A digital device for measuring complex values, containing a voltage-frequency converter, the output of which is connected to the first input. The first element And, the second input of which is connected to the first output of the control unit, the second output of which is connected to the K-inputs of the first and second reversible meters, and the input of the control unit is connected to the input of the frequency multiplier and the K-input of the counter, the output of the frequency multiplier is connected to the input counter, the outputs of which through the converter codes' are connected to the first inputs of the second, third, fourth and fifth elements And, the second inputs of which are connected to the output of the first element And, and the outputs are connected to the first inputs of the four elements OR comrade, whose outputs are connected to the inputs of two reversible counters, outputs of the first direct-down counter connected to the amplitude measuring indicator device inputs the count-phase device, characterized 759966 6 so that, in order to increase speed, a trigger, a pulse generator, two stroke transducers e frequency, a phase counter, an additional element I, are introduced into it, the second output of the control unit is connected to the K input of a phase counter whose outputs are connected to the inputs of the outgoing device phase, and the input is connected to the output of the pulse generator and, the frequency inputs of two code-to-frequency converters, the input of the pulse generator is connected to the trigger output, the 1st input of which is connected to the first output of the control unit, and the K input is connected to the output the house of the additional element And, the inputs of which are connected to the output "plus" of the first reversible counter and to the inverse outputs of the second reversible counter, direct and inverse outputs ^ outputs "plus" and "minus" of two reversible counters are connected to the corresponding inputs of the code converters to the frequency, the first the output of the first code to frequency converter is connected respectively to the second input of the first OR element, the second output is connected to the first output of the second code to frequency converter, the second inputs of the second and third el OR cops, and the second output of the second code frequency converter connected to the second input of the fourth OR gate.