SU792151A1 - Electric measuring instrument - Google Patents

Description

(54) ELECTRIC MEASURING DEVICE

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The invention relates to the field of electrical measuring equipment, in particular, to electrical measuring indicating devices without moving parts, and can be used in devices with analogue and digital readout of information.

The closest in technical essence is an electrical measuring instrument containing an indicator on gas discharge elements, an anode voltage driver, a cathode control unit, a frequency divider with a variable conversion factor, And element, voltage comparator, sawtooth generator, clock generator pulses and counter 1. The disadvantage of this device is that re. result The measurements are presented only in analog form in the form of a light column, i.e. the functionality of this device is limited.

The purpose of the invention is to enhance the functionality.

The goal is achieved by the fact that a known electrical measuring instrument containing an indicator on gas discharge elements, the first input of which is connected to the output of the anode voltage driver, and the second input - to the output of the cathode control unit, the first input of which is connected the output of the counter, the input of which is connected to the output of the clock pulse generator and the first input of the sawtooth generator, to the output of which the first input of the voltage comparator is connected, the second input to torogo Connected to the input terminal

15 devices, and the output — with the input of the anode voltage driver; a trigger, a delay unit, two pulse drivers, and a storage unit are input, and the clock pulse generator

20 is connected to the input (second) of the cathode control unit, the second input of the element I is connected to the voltage output of the cocharator, and the output to the BxonoNi block of the back-up unit, the output of which is connected to the first input of the trigger, the second and third inputs are connected respectively to the output the first and second pulse formers, the input of each of which is connected to the second input of the sawtooth generator and the first output of the counter, the second output of which is connected; with the first input of the memory unit, the second input of which is connected to the trigger output and the output to the output terminal of the device. The drawing shows the block diagram of the electrical measuring device. The device contains an indicator on gas discharge elements I, a cathode control unit 2, anode voltage driver 3, voltage comparator 4, clock generator 5, sawtooth voltage generator 6, counter 7, trigger 8, memory unit 9, element 10, shapers II and 12 pulses, delay unit 13 and input terminal 14. The device operates as follows. The measured voltage is applied to the input terminal 14 of the instrument. The voltage comparator 4 compares its voltage with the sawtooth, which generates the 6 sawtooth voltage generator. At the time of the equality of these voltage comparator 4, the voltage triggers the voltage level at its output from low to high. Subsequently, a low voltage level is denoted O and a high - 1), as a result of which the former 3 anode voltage disconnects the power supply of the indicator to the gas discharge elements t. In this case, the length of the luminous part of the column on the indicator on the gas discharge element x t is proportional. measured voltage. After the end of the measuring point at the control output of the counter 7, a pulse appears, which leads the cathode control unit 2 and the saw-tooth generator 6 to their initial states. This pulse is kept close to the beginning of the subsequent measuring cycle, while the presence of a pulse corresponds to O at the control output of counter 7. The code output corresponding to the analogous readings of the device (i.e. corresponding to the length of the light part of the column) is performed as follows . 14 In the case of the indication of a zero value of the measured values at the output of the voltage comparator 4 there is always 1, nosTONty at the time of the beginning of the measuring loop, when 1 appears at the control output of the counter 7, two pulses are simultaneously generated: a pulse at the output of the pulse former 12 which arrives at the installation input of the trigger unit 8 and sets the trigger 8 to the initial state, and the pulse at the output of the element 10. This pulse from the output of the element E Yu through the delay block 13 enters the input of the installation of the zero trigger 8 and throws three year 8 to the opposite state. The delay block 13 causes a time shift of the pulses arriving at the installation inputs of the trigger 8, which eliminates the uncertainty in the operation of the trigger 8, and the duration of said time shift is chosen significantly less than the duration of the clock pulse. At the moment of flip-over of the trigger 8, a signal is generated at its output, which arrives at the control input of the storage unit 9. Since the counter 7 at the moment of recording the information from its information outputs was in the initial state, in block 9 of the memory, zeros are written, which arrive at the code output of the device. At the moment of the end of the measuring cycle, O appears at the control output of counter 7, as a result of which a pulse is generated at the output of pulse generator 11, which arrives at the corresponding trigger input 8. However, since trigger 8 has already been rerun at the very beginning of the measurement cycle, this pulse does not change in this case, the state of the trigger 8, and the entry of the code output of the device is stored zeros. When overload is indicated at the output of the voltage comparator 4, O is constant, since the measured value always exceeds the voltage value at the output of the sawtooth voltage generator 6. therefore, at the output of the element And 10 and, therefore, at the output of the delay block 13, there are no signals in during the entire measuring cycle. At the beginning of the measuring cycle, the trigger 8 is turned on B, the initial state, and at the moment of the end of the measuring shaft, a pulse at the output appears at the control output of the counter 7.

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pulse generator II; trigger 8 is reversed to the opposite state. At the moment of this transfer on the trigger of trigger 8, a signal is generated, which arrives at the control input of the unit for remembering 9, as a result of which the last number is recorded, which corresponds to the counting state 7 at the time of termination of the measuring pin. For example, if the measurement limit corresponds to 2OO clock pulses, arriving at counter 7, the measuring cycle ends with the arrival of the 2O1 clock pulse, resulting in the overload to the code output of the device, the number 201 appears.

GPIs of the indication of the measured value, the value of which is in the measurement range, at the beginning of the measuring cycle of the Tpiirrep 8 are reset. At the moment when the comparator 4 triggers, the voltage at the output of the AND 10 element appears. An impulse appears through the delay block 13 to the input of the zero setting of the trigger 8 and flips the trigger 8. At the output of the trigger 8 a recording signal is generated, resulting in the memory block 9 recording the number corresponding to the state of the counter 7 at the moment of operation of the comparator 4 voltage. Thus, it turns out that the number of segments to which the bit in the indicator on the gas discharge elements was moved corresponds to the number that is written in memory block 9 and nocTj goes to the code output of the device, i.e. analogue readings and indications of the code output of the device correspond to each other.

The simultaneous availability of an analog and code outputs on an electrical measuring instrument greatly extends its functionality. The presence of analog readings allows the operator to easily assess the tendency of the monitored parameter to change, as well as quickly assess the values of the monitored parameters in the presence of a large number of serviced instruments.

At the same time, the presence of a code output makes it easy to document measurement results or enter them into computing devices. In addition, when

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1 digital indication of code D)) input significantly increases operator productivity when reading readings and when calibrating instruments, subtractive measurement errors are eliminated.

Claims (1)

Invention Formula Electrical measuring instrument containing an indicator on gas discharge elements, the first input of which is connected to the output of the anode voltage breaker forms, and the second input - to the output of the control cathode block, the first input of which is connected to the first input of the element And and the first output of the counter, the input of which is connected to output of the clock generator {ЛГпулёсов and nepsbnvi input of the sawtooth voltage generator, with the input of which the soeshpgen is the first input of the voltage comparator, in the second the input of which is connected to the input terminal of the device, and the output is connected to the input of the anode voltage driver, which is characterized by the fact that, in order to expand the f and geological possibilities, a trigger, a delay unit, two pulse shapers, and a memory unit {and, Next, the clock pulse generator is connected to the input (second) of the cathode control unit the second input element And is connected to the output of the voltage Comparator, and the output to the input of the rear section, the output of which is connected to the first input of the trigger, the second and third inputs of which are connected respectively to the output of the first and second pulse shaper, the input of each of which is connected to the second input of the generator the sawtooth voltage and the first output of the counter, the second output of which is connected to the first input of the memory unit, the second input of which is connected to the output of the trigger, and the output to the output terminal of the device. Sources of information taken into account in the examination I. USSR Copyright Certificate No. 676937, cl. About O1 TR 19/00, 1976. (prototype).