SU1030661A1 - Digital multi-integral instrument for strain-gauge type balance - Google Patents

Abstract

1. DIGITAL MULTI-INTEGRAL DEVICE FOR THERMOMETRIC WEIGHTS, containing a reversible counter, some outputs of which are connected to the inputs of an integrating counter, others - to the inputs of minimum and max. connected to a null organ, whose outputs are connected to the control inputs of a reversible counter, to the counting input of which a pulse generator and a counter of the number of input codes are connected, outputs. which is connected to the control unit and with an integrating counter, the outputs of which are connected to the output unit, characterized in that, in order to show accuracy at the beginning and at the end of the measurement scale by bringing the input signal into the middle zone of the scale, a block of calibrated unbalances is entered into it, a range decoder and a measurement result correction circuit, with the inputs of the calibrated unbalance unit connected to the outputs of the minimum and maximum sensors and the outputs to the control unit and one of the decoder inputs, etc. goy input of which the input and correction schemes result connected to the output of the integrating counter and the outputs of the decoder are connected to the input and output unit to the input circuit corrections result, the output of which is connected to the output unit. 2. An apparatus according to claim 1, characterized in that the block of calibrated unbalances is made in the form of maximum and minimum triggers, two coincidence circuits, two keys, two time delay elements, the prohibitory OR and cxeNttj prohibitions, and the inputs of maximum and minimum triggers connected to the maximum and minimum sensors, respectively, and their strokes are connected to the inputs of the measurement result adjustment circuit and via keys and time delay elements — to two inputs of the OR circuit, the third input of which is connected to the output of the inhibit circuit, Which odes are connected to the outputs of the maximum and minimum. 3. Device on PP. 1 and 2, tl and tmick, in that the range decoder is made in the form of four coincidence circuits, the signaling device CO of the junior and senior ranges, the inverter and the key, with one input of the inverter and one input of the second and connected to the output of the integrating counter, one output of the inverter connected to one input of the first and third matching circuits, and another output of the inverter connected to other inputs of the first and second matching circuit; other inputs of the third and fourth matching circuits connected to the output of the trigger pa calibrated maximum unbalance unit, an output of which minima flop connected to another input of the inverter, the output of the first coincidence circuit is connected to the alerter Jr. range, outputs

Description

The second and third match schemes are connected to the OR circuit, and the output of the quarter match circuit to the signal of the higher range.

4. device pop. 1-3, which differs in that the measurement result correction scheme is made in the form of a prohibition cell and an imitation cell, with the inputs of the cell for -: .. preta connected to the outputs of the integrating counter and the minimum trigger of the block of calibrated unbalances, the output of the maximum trigger and output memory cells are connected to the input of the simulation cell, the output of which is connected to the output unit.

one

This invention relates to a weight measuring technique.

Known electric scales with digital readout, containing a reversible counter, adder, switches.

In this device, the weight of the load in the electronic unit is reduced by a predetermined number and weight units and entered into the adder.

In the weighing range, lying beyond the maximum weight point of the load, the adder adds to the input value of the weight c + 1 a weight unit, and in the weighing range below the zero point, the adder adds 3 to the input weight; one.

This device provides an increase in the accuracy of measuring the weight lying at the boundaries of the measurement scale; however, it is not suitable in the case of using the multi-integral measurement method.

The closest to the invention to the technical essence is a digital multi-integral device for tensometric scales, containing a reversible counter, some outputs of which are connected to the input.m of the integrating counter, others to the inputs of the minimum and maximum sensors, and third - to the code-analogue converter, output which, the bridge output zero and the output of the load cell of the balance are connected to a null organ, whose outputs are connected to the control inputs of the reversible counter, to

account input KOTORO.GO CONNECTION € .N

a pulse generator, and a counter for the number of input codes, the outputs of which are €; dinene with the control unit and with the integrate1 1Im counter, the outputs of which are connected to the output unit 2

A disadvantage of the known device is that the accuracy is reduced when measuring at the beginning and at the end of the scale.

This disadvantage stems from the principle of multi-parting, which consists in repeatedly inserting into the integrating counter the code of the measuring reversible counter (usually 100 or 1000 pa followed by discarding when indicating or registering, respectively, two or three decades. The reversible counter in equilibrium state then goes to Addition mode, then into Subtraction mode due to the work of the null organ.

At the same time, the code of the reversible counter changes under the influence of noise or dynamic effects of Dudars, vibration, etc.).

Since the reversible measurement counter has a counting stop scheme with a code value of 00000, if subtraction occurs in this case, and with a value of 9999, if an addition occurs, all negative signal values will be represented by code 0000 of the reversible counter, and all signal values above the upper limit of the scale - code 9999. As a result, the summation at the beginning of the scale of a known device overstates the result, since it does not feel the negative values of the signal, and at the end of the scale it underestimates.

The aim of the invention is to improve the measurement accuracy at the beginning and at the end of the measurement scale by bringing the input signal into the middle zone of the scale.

The goal is achieved by the fact that a digital multi-integral device for strain gauge scales contains a reversible counter, some outputs of which are connected to the inputs of the integrating counter, others to the inputs of the minimum and maximum sensors, and third to the code-analogue converter, the output of which is the bridge output the zero and the output of the scale load cell are connected to a zero-body, the outputs of which are connected to the control inputs of the reversible counter, to the counting input of which are connected a pulse generator and a count of the number of input codes one of which is connected to a control unit and an integrating counter, the outputs of which are connected to the output unit, a calibrated unbalance unit, a range decoder and a measurement result correction circuit are entered into it, the 6jioKa inputs of the calibrated unbalances are connected to the outputs of the minimum and maximum sensors, and the outputs - with the control unit and with one input of the decoder, the other input of which and the input of the result adjustment circuit are connected to the output of the integrating counter, and the outputs of the decoder are connected to the input of the output one block and to the input of the result correction circuit whose output is connected to the output block.

In this case, the block of calibrated unbalances is made in the form of maximum and minimum triggers, two coincidence circuits, two keys, two time delay elements, an OR circuit and a inhibit circuit, with the max and minimum trigger inputs of the coincidence circuit being connected to the sensors, respectively. and minimum, and their outputs are connected to the inputs of the measurement result correction circuit and through the keys and time delay elements - with two inputs of the OR circuit, the third input of which is connected to the output of the inhibitor circuit, whose inputs are connected to the output I will give sensors of a maximum and a minimum.

In addition, the range decoder is made in the form of four coincidence circuits, low and high alarm indicators, an inverter and a key, with one inverter input and one input of the second and fourth coincidence circuit through a key connected to the output of the integrating counter, one output of the inverter connected to one input the first and third coincidence circuits, and the other output of the inverter is connected to other inputs of the first and second coincidence circuits, the other inputs of the third and fourth coincidence circuits are connected to the output of the maximum trigger of the calibration block unbalances whose minimum trigger output is connected to another input of the inverter, the output of the first coincidence circuit is connected to the low range signaling device, the outputs of the second and third coincidence circuit are connected to the OR circuit, and the output of the fourth coincidence circuit to the high range signaling device

The measurement result correction circuit is made in the form of a prohibition cell and an imitation cell, with the prohibition cell inputs connected to the outputs of the integrating counter and the minimum trigger of the calibrated unbalance unit, the maximum trigger output of which and the output of the memory cell are connected to the output one block.

FIG. 1 shows a block diagram of the device; in fig. 2 - a block of calibrated unbalances, a range decoder and a result adjustment circuit.

A digital multi-integral device contains a converter 1 code - an analogue, bit-switched with a reversible counter 2, filled with pulses of the generator 3 according to commands of the zero-organ 4. The signal of the converter 1 compensates

5 measurement signals (for example, a strain gauge sensor 5 and a bridge 6 zero with an initial balancing resistor 7 used, for example, to compensate for weight

0 tare.

To transfer the code, the outputs of the reversible counter 2 are connected to the integrating counter 8, the upper triggers 9 of which are connected for display or registration directly to the output unit 10, and the selected trigger 11 through the result correction circuit 12. The integration produces 0 by the commands of the control unit 13 and the counter 14 by the number of entries of the code.

Minimum sensor 15 and maximum sensor 16 are the matching schemes respectively

5 zero meters and units of senior triggers 17 of the reversible counter 2. Minimum sensor 15 is triggered, for example, if the four-charge reversible counter 2 code is less than 100, and the maximum sensor 16 is if

About more than 9900.

A block of 18 calibrated unbalances, controlled by a button 19 Measurement and sensors 15 and 16, connects calibrated resistors

5 20 n 21 with their contacts 22 and 23, and the output Start measurement of block 18 is connected to the input of control block 13.

0

The output of block 18 calibrated imbalances is connected to the output; device 10 and circuit 12 for adjusting the result through a decoder of 24 ranges. For changing ranges, there is a switch 25 and

5 resistors 26 and 26 ranges.

Block 18 of calibrated unbalances (Fig. 2) contains coincidence circuits 28 and 29, minimum trigger 30, maximum trigger 31, keys

0 32 and 33, elements 34 and 35 of the time delay, the prohibition circuit 36, on the forbidding inputs of which the signals of the minimum and maximum sensors 15 and 16 are supplied.

five

Signal The measurement supplied by button 19 passes to the input of control unit 13 through an OR circuit 37. Contacts 22 and 23 connecting the calibrated resistors 20 and 21 to the bridge bilo are the contacts of keys 32 and 33. Decoder 24 diazones (Fig. 2) contains the key 38, controlled by the command End of Measurement of the control unit 13, inverter 39, coincidence circuits 40-43. Circuits 41 and 42 of the match are connected through the circuits OR 44 to the output unit 10, and circuits 40 and 43 are connected to the signaling devices 45 and 46 with the correspondingly lower and higher ranges.

The measurement result correction circuit 12 comprises a prohibition cell 47 and a simulation cell 48 connected in series and switching the output of the trigger 11 of the integrating counter 8 to the input of the output unit 10.

The output cxeNM OR 44 is used, for example, to supply power to the decoder of the output unit 10, in order to indicate or record only the corrected result that is within the scale of the instrument. During operation In the middle part of the instrument scale, power is supplied to the output unit 10 through the normally closed contacts 49 and 50 of the keys 33 and 32, and during operation on the edge of the scale through the output contact 51 cxeMt-a OR 44.

Digital multi-device works as follows.

If the measured value is such that neither the maximum sensor 16 nor the minimum sensor 15 is triggered, the measurement is made outside the scale) /, then pressing the button 19 Measurement through the inhibitor circuit 36 and the OR circuit 37 with a pulse The control unit 13 starts up, the command of which starts transferring the code of the reversible counter 2 to the integrating counter 8. When counting a predetermined number of transfers, for example 100 times, the counter of 14 hours of code entries issues a command to finish the transfers, and at the output of the control unit 13 a command is formed End and measurement.

Consider the work of the decoder 2 range and the scheme 12 adjustments to the result.

Suppose that when the maximum sensor 16 is triggered, the potential at the output of the trigger 31 (point a in Fig. 2) becomes equal to a logical unit (previously there was a potential of logical zero),

Accordingly, the potential at the output of the keys 32 and 33 (point d in FIG. 2), when the sensors 15 and 16 are triggered, becomes equal to zero (before the operation was equal to one).

Since in this case neither the sensor 15 nor the sensor 16 worked, then at the output of the inhibit cell 47 we have one, and at the output of the simulated cell 48 - zero.

The prohibition cell 47 is a unit coincidence circuit, therefore its output signal is determined by the output of the selected trigger 11 of the integrating counter 8. If the output of the trigger 11 is zero, then the output of the cell 47 is zero, if at the output of the trigger 11 it is one, then and at the output of cell 47, the unit.

Cell 48 is an OR scheme, so the presence of a unit at any input provides a unit at the output. Consequently, at the input of block 10 the same potential as at the output of trigger 11, i.e., the code of the integrating counter 8 is decrypted without correction.

Since none of the keys 32 and 33 failed, contacts 49 and 50 remained closed and provided an indication or registration of the code by the output unit 10.

In the considered case, when opening the key 38 by the command End of Measurement, there is a zero potential at the inputs of the coincidence circuits by units (points Q, 1 in Fig. 2), therefore the OR 44 circuit or the signaling devices 45 and 46 of the lower and higher ranges do not work, and the output zero potential is provided by the operation of inverter 39, which converts a single potential at the input to zero at the output (or vice versa).

Let us now consider the operation of the device when measuring the value at the beginning of the scale or a smaller initial value, i.e. when triggered sensor 15 minimum. In this case, when the button 19 is pressed through the coincidence circuit 28, the minimum trigger 30 is activated. In this case, the prohibition circuit 36 will be closed by the potential of the sensor 15, so that the start of measurement signal from the output of the circuit 36 cannot pass.

Together with the trigger 30, the key 32 is triggered, the contact of which 22 (Fig. 1) connects a calibrated resistor 20 to the location 6 zero, providing a positive (i.e., imbalance in the direction of increasing the measured value, the value of which is chosen in advance equal to, for example, 1000 units scales at

Bor and the corresponding nominal value of the trigger 11 of the integrating counter 8. Thus, the ratings of the resistor 20 and the trigger 11 are rigidly interconnected.

When a resistor 20 is connected, the equilibrium in the device is disturbed, the zero-organ 4 is triggered, and the reversible counter 2 is switched to the addition mode. After some time, less than the exposure time 34, the equilibrium in the device will be restored by filling the reversible counter with 2 pulses from the generator 3. Counter 2 code increases by 1000 units, i.e. instead of supposing that the original code is an average of 0020 units, in an up-down counter 2 a code sets an average of 1020 units. The term is, on average, used in the sense that the code of the reversible counter 2 constantly scrolls around a certain mean value, which is a feature of multi-integral devices. The meaning of such a shift from zero code values to the positive area is that when working in the zero value area there is a fundamental tendency to overestimate the result caused by the fact that the code values of the reversible counter 2 {and accordingly the measured value less than zero are displayed in the resulting integrating code the counter is 8-zero (i.e., larger than in reality) codes, since for all values of the measured value, less than zero, the code of the reversible counter 2 is zero.

After testing the unbalance by the signal from the output of the time-delaying element 34, the OR-37 circuit is triggered by a pulse. Start of measurement is the control unit 13.

The increased code of the reversible counter 2 is transferred, say 100 times, to the integration of the counter 8, while the counter 14 counts the number of code entries and after the measurement is completed by the control unit 13, the End of Measurement signal is output.

Moreover, in the senior decades of the integrating counter 8, i.e. in the decades connected to the output unit 10 and subject to indication or registration, a number is dialed, suppose 1020. Since in fact the measured value was 20 units, we will show how this is displayed by output unit 1

Since the sensor 15 was triggered, then at the output of key 32 of the key there is a zero potential. Therefore, a single potential trigger 11 (since the counter code 1020

will not be transferred to the output of the 47 ban cell and, accordingly, to the input of the imitation cell 48. At the other input of the simulation cell 48, the zero potential comes from the output of the maximum trigger 31, which did not work.

Thus, at the output of the cell 48 there will be zero potential, i.e. with a single trigger output 11

0 is transmitted to output block 10, i.e. The number 0020 is decrypted, instead of 1020, in integrating counter 8. When the key 38 is opened with a pulse. Measurement end. The single potential from trigger 11 goes to coincidence circuit 41 and 43 and zero (due to inverter 39) to circuit 40 and 42 inputs. circuits 40-43 match

0 units, the only circuit, at the input of which there are two units, will be the circuit 41, from the output of which the circuit OR 44 operates, the output contact of which 51 is closed.

The power supply to the decoder of the output unit 10 is provided by this contact, since contact 50 is open (its key 32 has tripped}.

Thus, with a small positive input signal, its accurate measurement and correct indication (registration) is ensured.

Consider the case when the measured value is negative.

5 (suppose 50 units).

In this case, after the end of code transfers from counter 2, 950 units will be accumulated in counter 8, i.e. trigger 11 does not set 0 to a single value. At zero output of the trigger 11, a single potential will arrive at the circuits 40 and 42 of coincidence, and the inputs of the circuits 40 and 41 also have a single potential, since the trigger 30 of the mini5mum worked.

Thus, only all inputs of the circuit 40 are units, as a result of which the low-range alarm 45 is activated,

0 representing, for example, a backlit display. Go to the lower range. The decoder of the output unit 10 is not receiving power at the same time, since the circuit 44 does not

5 has been activated and its contact 51 has remained open, contact 50 is also open, as key 32 has been triggered.

Incorrect result

0 is not indicated at all.

In accordance with the indication of the indicator 45, the operator 25 switches on a range resistor 27 corresponding to an imbalance equal to the entire scale of the device (for example, 10,000 units), after which the measurement is performed repeatedly. The range change operation can be easily automated, which is not considered here because Triggers 30 and 31 are set to zero position before another measurement in one of the known ways, for example, from button 19 with the use of an accelerating capacitor connected to the Inu reset trigger 36 and 31. Consider the operation of the instrument in volume with when the measured value is near the upper limit of the scale. Let the true value of the code 9950 and the maximum sensor 16 worked. The key 33 connects a calibrated resistor 21 to the bridge zero, shifting the code of the reversible counter by 1000 units downward. After decompensation, the code of the reversible counter 2 will be on average 8950 units, i.e. trigger 11 has a zero potential, but it should have had a single (9 4 + 2 + 2 + 1, since the device works in the code,, 2,2,1). At outputs Q and O of block 18, we have a single potential. At the inputs of the prohibition cell 47, the unit is zero, and the output is zero. At one of the inputs, cell 48 is zero, at the other one, the output is one, since the simulation cell 48 is an OR circuit by units. Thus, one will be transmitted to the output block 10, although zero is output at the output of trigger 11, that is, the number 9950 will be decoded, although 8 8950 is integrated in the integrating counter. At the inputs of circuits 40 and 41, the matches are zero thanks to the inverter 39 and at the inputs 42 and 43 there are one. Circuit 42 is the only one that has units on both inputs, so the OR 44 circuit works and through its contact 51 it receives power to the decoder of the output unit 10. Now suppose the true value of the code is 10020 and the sensor 16 has been triggered. After turning on the calibrated resistor 21, the code of the reversible counter 2 will become on average equal to 9020, i.e. trigger 11 is set to a single position. A single potential appears at the inputs of the circuits 41 and 43 and at both inputs of the circuit 43, which leads to the triggering of the high-level indicator 46. An incorrect code is not displayed, Tait is not closed as contact 51, and contact 49 is open, as key 33 has been triggered. The operator, as instructed by the detector 46 by switch 25, connects a range resistor 26 to bridge 6 zero and repeats the measurement. The value of the resistor 26 is selected so that it creates an imbalance equal to the scale of the device, for example 10,000 units. Thus, the proposed instrument provides an accurate measurement both in the middle and along the edges of the scale, i.e. has an increased accuracy compared to the known. In addition, in the proposed instrument, the task of switching ranges is solved, which is fundamentally impossible in the known, since the error of the latter at the beginning and end of the scale does not allow for the correct determination of the range boundaries.

26 25 27

Fi2..1

2

Claims (4)

1. DIGITAL MULTI-INTEGRATED DEVICE FOR TENZOMETRIC WEIGHTS, containing a reversible counter, some outputs of which are connected to the inputs of the integrating counter, others - to the inputs of the minimum and maximum sensors, and the third - to the code-analog converter, the output of which, the output of the zero bridge and the output of the load cell connected to a null organ, the outputs of which are connected to the control inputs of a reversible counter, to the counting input of which a pulse generator and a counter for the number of input codes are connected, outputs. . which are connected to the control unit and to an integrating meter, the outputs of which are connected to the output unit, characterized in that, in order to increase accuracy at the beginning and at the end of the measurement scale by bringing the input signal to the middle area of the scale, a block of calibrated unbalances, a decoder, are introduced into it ranges and the correction scheme of the measurement result, with the inputs of the calibrated unbalance unit connected to the outputs of the minimum and maximum sensors and the outputs to the control unit and one of the inputs of the decoder, the other input otorrhea and input adjustments result Schemes connected to the output of the integrating counter and the outputs of the decoder are connected to the input and output unit to the input circuit corrections result, the output of which is connected to the output unit. 2. The device according to claim 1, characterized in that the calibrated imbalance block is made in the form of maximum and minimum triggers, two coincidence circuits, two keys, two time delay elements, an OR circuit, and a prohibition circuit, and the maximum and minimum trigger inputs through coincidence circuits respectively connected to the maximum and minimum sensors, and their outputs are connected to the inputs of the correction circuit of the measurement result and through the keys and time delay elements to two inputs of the OR circuit, the third input of which is connected to the output of the inhibit circuit, the inputs to are connected to the outputs of the maximum and minimum sensors. 3. The device according to paragraphs. 1 and 2, characterized in that the range decoder is made in the form of four coincidence circuits, a low and high range signaling device, an inverter and a key, with one input of the inverter and one inputs of the second and even ¹ · fourth matching circuits through a key connected to the output of the integrating counter, one output the inverter is connected to one input of the first and third coincidence circuits, and the other inverter output is connected to other inputs of the first and second coincidence circuits, the other inputs of the third and fourth coincidence circuits are connected to the output of the maximum trigger b eye calibrated imbalance output trigger whose minima is connected to another input of the inverter, the output of the first coincidence circuit is connected to the alerter Jr. range, the outputs of the second and third circuits · coincidence sub key to OR circuit, and the output of the coincidence circuit quarters - Warning to older range. 4. The device popp. 1-3, characterized in that the correction scheme of the measurement result is made in the form of a prohibition cell and a simulation cell, and the inputs of the cell ea -: _.> Preta are connected to the outputs of the integrating counter and the minimum trigger of the calibrated unbalances block, the maximum trigger of which and the output of the memory cell is connected to the input of the simulation cell, the output of which is connected: to the output unit.