SU1583894A1 - Digital meter of magnetic induction - Google Patents

Abstract

The invention relates to the field of magnetic measurements and can be used for precision measurements in a wide range of induction of constant magnetic fields. The aim of the invention is to improve the measurement accuracy. The digital magnetic induction meter contains a Hall sensor 1, a switch 2, a power supply 3, a synchronous detector 4, a voltage-to-pulse number converter 5, a counter 6, a binary-decryption decoder 7, a digital reading device 8, a control block 9, And 10 elements and 11, the triggers 12 and 13, the decoder 24, the character indicator 15, the element 16, the trigger 17 and the indicator 18. The measurement results stored in the counter 6 are read by the digital device 8, and the induction direction is indicated by the sign indicator 15. 1 il.

Description

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The invention relates to the field of magnetic measurements and can be used for precision measurements in a wide range of induction of constant magnetic fields.

The purpose of the invention is to improve the measurement accuracy,

The drawing shows a block diagram of a digital magnetic induction meter. The circuit consists of a Hall sensor 19 of a switch 2, a source of 3 liters, a synchronous detector 4, a voltage converter 5 — the number of pulses, a counter 6, a binary-decoding decoder 7, a digital reading device 8, a control unit 9, And 10 and 11 elements, the trigger 12 and 13, the decoder 14, the indicator. 15 mark, element And 16, the trigger 17 of the indicator 18.

Hall sensor current electrodes

1 connected to the inputs of the switch 2 "The potential electrodes of the Hall sensor I are connected to the inputs of the switch 2. The output of the switch 2 is connected to the signal input of the synchronous detector 4. The output of the switch

2 is connected to the common (case) input of the synchronous detector 4. The control input of the synchronous detector 4 is connected to the control output of the power supply 3. The signal outputs of the power source 3 are respectively connected to the inputs of the switch 2, the control input of the switch 2 is connected to the first output of the control unit 9.

The output of the synchronous detector 4 is connected to the first input of the voltage converter 5 - the number of pulses, the second input of which is connected to the second output 19 of the control unit 9, the first output of the voltage converter 5 - the number of pulses connected to the first input of the counter b and the single trigger input 17, Second the output of the voltage converter 5 is the number of pulses connected to the first inputs of the elements 10 and I.

The input of counter 6 is connected to the first water 1-H1 of binary-decimal decoder 7 and element 16, the second installation zero input of counter 6 is connected to the first output of divider 14, the third installation zero input of counter 6 to the third output of control block 9, the second input binary decimal decryption

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Section 7 - with the fourth output of the control unit 9, the output of the binary-decoding decoder 7 - with the input of the digital reading device 8.

The fifth input of the control unit 9 is connected to the second input of the AND element 10, the sixth output of the control unit 9 is connected to the second input of the AI element, the seventh output of the control unit 9 is connected to the zero inputs of the flip-flops 12 and 13, the eighth output of the control unit 9 is connected to the first input of the decoder 14, the ninth output of the control unit 9 is connected to the second input of the element AND 16.

The output element And 10 is connected to a single input of the trigger 12, the output of the element And 11 is connected to a single input of the trigger 13. The output of the trigger 12 is connected to the second input of the decoder 14, the output of the trigger 13 is connected to the third input of the decoder 14, the second and third outputs of the decoder 14 are connected, respectively with the first and second inputs of the indicator 15 characters. The output element And 16 is connected to the zero input of the trigger 17, the output of the trigger 17 is connected to the input of the indicator 18.

The operation of the device takes place in two measurement cycles. In the first measurement cycle, the output signal U (They + and NE) of the Hall sensor 1 is fed through switch 2 and synchronous detector 4 to the converter 5, the voltage is the number of pulses. The result of the conversion in the form of pulses is fed to the counter 6

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Nf KjKjlx 4 UH9 |,

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where KI is the conversion factor

synchronous detector; K4 is the conversion factor of the voltage converter — the number of pulses; 1x - Hall EMF;

Ujjg - non-equipotential stress “

At the end of the first cycle, the control unit 9 switches the switch 2. In the second measurement cycle, the output signal of the Hall sensor 1 will be U2 - (-1x n) This voltage through the synchronous detector 4 is fed to the converter 5, the voltage is the number of pulses, from which there is a sequence of pulses enters the counter 6. Depending on

load | 1X | and IUH3 | The coding results of the two clocks are completed or the counter 6 is reset.

With | 1 „| lUte is the summation of the coding results

U SHI + | UZ | K, Kg | 1 + INE | +

+ K, Kg | 1, - ju | 2KtKg1x, U2 (1X).

At I1X I IAG, the coding results are summed up; and then the counter 6 is reset.

Information about the summation of the coding results of two clocks or the resetting of the readings of the counter 6 is extracted using And 10 and 11 elements of the triggers 12 and 13 and the decoder 14.

In the first cycle, the polarity of the output signal of the detector 4 is recorded, which corresponds to the direction of magnetic induction, the voltage determined by the converter 5 is the number of pulses. In the first cycle, the element And 10 and the trigger 12 are triggered, and in the second cycle also the element And 11 and the trigger 13.

After the second measurement cycle, the decoder 14 outputs the sign of the output signal of the Hall sensor 1 to the sign indicator. When and + B (magnetic induction), the element And 10 and the trigger 12 are triggered in the first measurement cycle, since the permitting potentials are fed to both inputs of the element And 10. The output signal of the element And 10 translates the trigger 12 in one state. In the second measurement cycle, the resolving potentials arrive at both inputs of the element AND 1 1. Element And 11 triggers and translates trigger 13 into one state. The decoder 14, after the end of the second measurement cycle, provides the resolving potential via the + bus to the indicator 15 characters.

When Ujfl lU I In triggers 12 and 13 do not work, because in the first clock to the second input of the element And 10, and in the second clock to the input of the element And 11 from the voltage converter - the number of pulses enters the inhibitory potential. The decoder 14, after the end of the second cycle of measurement, provides the resolving potential through the bus to the indicator 15 characters.

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When | 1 1 INE |, regardless of. directions of induction of polarity you-. the input signal of the Hall sensor 1 will be + in the first cycle and - in the second measurement cycle.

Therefore, in the first clock cycle, the resolving potentials arrive at both inputs of the element And 10, it is triggered and translates trigger 12 into a single state. In the second cycle, the control signal does not pass through the control element and the trigger 13 remains in its original state. After the second measurement cycle, the decoder 14 is triggered and issues a setup signal to counter 6, which is set to the zero state. The measurement result stored in the counter 6 is read by the digital reading device 8, and the induction direction is indicated by the indicator 15 characters.

The operability of the device at its zero readings is determined as follows.

With a zero inoperative instrument, when its readings are equal to zero at the end of the second measurement cycle, the element AND 16 is triggered and places the trigger 17 in the unit state. At this time, indicator 18 lights up.

During normal operation of the device, the input of the counter 6 is from the voltage converter — the number of pulses receives at least one counting pulse. This pulse triggers the trigger 17 to the zero state. At the same time the indicator 18 does not light up. Since the reset of the counter 6 is performed after the end of the second measurement cycle, the AND 16 circuit, which is set to zero, does not work, since the current code is not in the counter 6.

Claims (1)

Invention Formula A digital magnetic induction meter containing a Hall sensor connected in series, a switch, a synchronous detector, a voltage converter — the number of pulses, a counter, a binary-decryption decoder, a digital reading device, the sign output of the voltage converter — the number of pulses connected to the first inputs The first, second, and second elements are And, the output of the first element And is connected to the single input of the first trigger, the output of the second element And is connected to the unit 715838948 the second trigger input, the output of the cell voltage is the number of pulses that is connected to the first input with the second zero set input of the decoder, the second input of which counter, with the second input of the first, is connected to the output of the second trigger, element I, and the second input of the second decoder output is connected to the first element And, with the first input of the third zero setting input of the counter element I, with the zero inputs of the first, the second and third outputs of the decoded and second triggers, with the second input, respectively, are connected to the first double a decimal decoder and the second inputs of the character indicator, JQi with the third input of the decoder, the second one characterized in that the swarm input of the third element AND is connected to improve measurement accuracy, the output of the counter, the input of which is entered the third element And, the third trigger is connected to the zero input, the indicator and the control trigger block, the single input of which is not, the control outputs of which are connected J5 to the output of the third elementaline with the control input of the switch I, and the output of the third trigger - chatel, with launch input preo A single-ra connected to the output indicator.