SU1027816A1 - A.c. voltage digital ampilitude meter - Google Patents

Abstract

A DIGITAL AMPLIFIER METER: ACCURATE VOLTAGE TUDS, containing a driver, the input of which is connected to the bus of the signal being converted and the first input of the zero-organ, the second input of which is connected to the output of the digital-analog converter, and the output is connected to the first input of the memory cell, the output of which is connected to G the first input of the control unit, the outputs of which are connected to the inputs of the digital-analogue converter, and the second input is connected to the output of the second trigger and the input of the delay line, the output of which is connected to the second the input of the memory cell and the first input of the second trigger, the second input of which is connected to the installation bus, the third input - with the output of the former fourth input - with the output of the first trigger, so that, in order to extend the range frequencies of the measured voltage and increase in noise resistance of the meter, the output is shaped (L body is connected to the first input of the first trigger, the second and third inputs of which are connected to the additional output of the delay line.

Description

11 The invention relates to digital measurement technology and can be used to measure the amplitude of an alternating voltage. A device for measuring the amplitude of an alternating voltage, containing a null pulse type organ, a measuring divider, a programming and controlling device, a source of basic voltage, and a polarized relay, the relay winding being powered by the input alternating voltage, and from A synchronization signal is supplied from the relay contacts for the operation of a potentiometer meter tl3. The scope of this device is limited as it has a limited frequency range of measured variable voltages. The closest to the present invention is a digital voltage amplitude meter containing a driver, the input of which is connected to the bus of the signal being converted and the first input of a zero-body, the second input of which is connected to the output of the digital-analog converter and the output connected to the first input of the cell the memory whose output is connected to the first input of the control device, the output of which is connected to the inputs of the digital-analog converter, and the second input and output is connected to the output of the second trigger and the input of the delay line, the course of which is connected to the second input of the memory cell and the first input of the second trigger, the second input of which is connected to the installation bus, the third input to the output, the former, the fourth input to the output of the first trigger. The field of application of this device is limited, since it has a limited frequency range of measured variable voltages, because with an increase in the frequency of the measured voltage, the duration of the pulses fed to the control device decreases and can reach a value at which the control device will not operate , low noise immunity as there is a possibility of failure, if the delay time of the delay line and the period of the measured voltage will be in the following relationship: 6 Glb-C2i - 1 1,2,3 ... where, for the output trigger pulses are generated very short duration from which the trigger can not work. The purpose of the invention is to expand the range of frequencies of the measured voltage and increase noise immunity, the meter. The goal is achieved by the fact that a digital voltage amplitude meter contains a driver, the input of which is connected to the bus of the signal being converted and the first input of the zero-organ, the second input of which is connected to the output of the digital-to-analog converter, and the output is connected to the first input of the memory cell whose output is connected to the first input of the control device, whose inputs are connected to the inputs of the digital-to-analog converter, and the second input is connected to the output of the second trigger and the input of the delay line, you the course of which is connected to the second input of the memory cell and the first input of the second trigger, the second input of which is connected to the installation bus, the third input is connected to the output of the former, the fourth input to the output of the first trigger, the output of the former is connected to the first input of the first trigger, second and third (inputs which is connected to the auxiliary output of the delay line. Fig. 1 shows a structural diagram of the device; Fig. 2-4 shows time diagrams of the operation of the device. The device (Fig.) Includes a shaper 1, two triggers. 2 and 3, a multi-tap delay line C, a control device 5, a memory cell 6, a zero-body 7 and a digital-to-analog converter 8 (for example, a controlled voltage divider) -. A sweep register or counter can be used as a control device. In the time diagrams of the operation of the device for measuring the amplitude of the alternating voltage, the period Tg is significantly longer than the time of transients (T2) and 1LP and the control device (Fig. 2), the period Tg is commensurate with T / i, (Fig. 3), the period Tg, y is smaller. FIG. four . Before the start of the measurement, the trigger 3 is set to one. The former 1 converts the input alternating voltage into a rectangular form of a certain amplitude. If the initial state of flip-flop 2 is single, then the very first voltage drop at the output of imaging unit 1 flips flip-flop 3 from one to zero state. If the initial state of flip-flop 2 is zero, then the voltage front from the output of shaper 1 / sets it to one, thereby allowing triggering of flip-flop 3 from impulses of shaper 1. The voltage drop resulting from the output of flip-flop 3 goes to control device 5, which sets at the output of the digital-to-digital converter 8 the first value of the compensating voltage. In addition, the voltage drop from the output of the trigger 3 is fed to the input of the delay line k. After a time T determined by the minimum allowable duration of control pulses at the first input of control device 5, the voltage drops to the first retraction of the delay line k and sets trigger 2 to zero, and zero potential at second input of trigger 2 is blocked the passage of pulses from the imager 1. After a time T equal to or greater than the transient time of the device 5 pack | evacuation and digital-analog converter 8, the voltage across the second tap of the delay line k is fed to the input of the trigger 3, y tana Lib it in a single state, and the input of the memory cell 6 by mounting it in a state of overcompensation. After 7 / after the establishment of the trigger 3, the blocking of the trigger 2 is released in one state and the front of the front of the driver 1 is set-. The trigger 2 is set to one, thereby removing the lock from trigger 3. By decreasing the voltage from the driver 1, the trigger 3 is set to the zero state. Upon a voltage drop at the output of the trigger 3, the control device is activated, setting the next value of the compensating voltage, taking into account the state of the memory cell 6. By means of tr, trigger 2 is reset to the zero state and triggering of trigger 3 from impulses from driver 1 is blocked, and so on. until the control unit 5 processes all the digits of the digital code. Thus, when the compensating voltage is changed, each input voltage period is produced (Fig. 2), every second period of the input voltage (Fig. 3) is produced during the replacement of the compensating voltage, and, at T - C, the compensation voltage is produced through several periods (Fig. Y, depending on how much m ;: is longer. At the same time, the duration of the pulses coming from trigger 3 to control device 5 will always be longer than G, and their duration cannot be less than JT- + 7G. Fig. A resolved var ant, wherein the mouth | X) ystvo prototype runs steadily noimenee 3.

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Claims (1)

AC VOLTAGE DIGITAL METER, comprising a driver whose input is connected to the bus of the signal to be converted and the first input of the zero-organ, the second input of which is connected to the output of the digital-to-analog converter, and the output is connected to the first input of the memory cell, the output of which is connected to the first input control device, the outputs of which are connected to the inputs of the digital-to-analog converter, and the second input is connected to the output of the second trigger and the input of the delay line, the output of which is connected to the second input of the cell memory and the first input of the second trigger, the second input of which is connected to the installation bus, the third input - with the output of the driver, the fourth input - with the output of the first trigger, so that in order to expand the range frequencies of the measured voltage and increased noise immunity; meter; the output of the driver is connected to the first input of the first trigger, the second and third inputs of which are connected to the additional output of the delay line. SU, „, 1027816> 1 1027816 '2