SU1243093A1 - Digital voltmeter - Google Patents

Abstract

This invention relates to electrical measuring technology and can be used in digital voltmeters. A digital voltmeter containing a voltage converter 4 in a time interval connected via register 5 to an indicator device 8, a counter O, whose input is connected to the output of the master oscillator, and an output through the converter 9 of the integration interval of the signal being converted 4. To increase the accuracy of temperature and time stability, a pulse shaping unit 12, a filter 11 and an input switch 10, whose input is a bus of the voltage being converted, are entered into it, and the output through The filter 11 is connected to the input of the voltage to be converted by the voltage converter A to the time interval. The corresponding outputs of the counter 6 are connected to the control input of the driver 2 of the reference voltage and the input of the driver 12 of the pulses, the outputs of which are connected to the corresponding inputs of the second group of inputs of the measurement limit switch 1, the second with S (L N9 U CO o F ca TU J. - fS 11, hnr U-, - -) / 7 И-4 J L-Jj T1 (, l | 1 g / 5 | -, IIU J) / 7 И-4 L-Jj

Description

1243093

the output of which is connected to the control unit on the filters 16-18, keys 13-15 and input input of the key 10. Form-1 and block 19 of impulse generators, the sender 2 of the reference voltage is 1 hp. f-ly, 1 ill.

one

The invention relates to electrical measuring equipment and can be used in digital voltmeters.

The purpose of the invention is to improve the measurement accuracy, temperature and time stability.

The drawing shows a diagram of a digital voltmeter.

The digital voltmeter contains a measurement limit switch 1, the first group of inputs of which is connected to the corresponding outputs of the formation 2 of the reference voltage, the reference input of which is connected to the output of the source of the reference voltage 3, and the first output of the switch 1 of the measurement limits is connected to the input of the reference voltage of the converter 4 time interval, the output of which is connected to the control input of the register 5, to the information M inputs - of which the corresponding outputs of the counter-6 are connected, to the counting input to The output of the master oscillator 7 is connected, the outputs of the register are connected to the corresponding inputs of the indicator device 8, and the control input of the voltage converter 4 in the time interval through the driver 9 of the integration interval of the converted signal. with the corresponding outputs of the counter 6, the input key 10, whose input is the bus of the voltage to be converted, and the output through the filter 11 is connected to the input of the voltage to be converted of the voltage converter 4 in the time interval, and the corresponding outputs of the counter 6 are connected to the control the inputs of the driver 2 of the reference voltage and the input of the pulsing unit 12, the outputs of which are connected to the corresponding inputs of the second group of inputs of the measurement limit switch 1, the second code of which is connected to the control 1m the input of the input key, while the driver 2 of the reference voltage is executed on the phyles 13-15, the keys 16-18 and the driver 19 of the pulses, the inputs of which are the control inputs of the driver 2 of the reference voltage, and the outputs are connected to the control inputs of the corresponding keys 16-18, the information inputs of which are combined and are the reference input of the reference voltage driver, and the output of the key from the keys through the corresponding filter 13-15 is connected to the corresponding output of the reference voltage generator 2.

The pulse shaping unit 12 and the imaging unit 19 are AND elements connected to the corresponding bits of the counter 6 for receiving output pulses of the corresponding duration, controlling the keys 10 and 16-18.

Digital voltmeter works as follows.

The master oscillator 7 operates in continuous mode, at the output of the counter 6, a continuously varying digital code is obtained, defined

the value of which, numerically equal to the measured voltage, is written at the end of the measurement to the register 5 by the signal of the voltage converter 4 in the time interval. At the same time, control signals are generated from a continuously variable digital code of counter 8 using shaper 9 and blocks 12 and 19 of shaper drivers. At the output of the driver 9, a sequence of clock pulses is formed to control the voltage converter 4 in a time interval. At the outputs of the first bores of the formers, 12 pulses form ayutc sequence of pulses with a duty cycle Q | , and Q corresponding to one of the necessary

division factors K, K1. and Kjj of the input voltage, which, through the measurement limit switch 1, are supplied to control the input key 10,

At the outputs of the second block of the pulse former 19, pulse sequences are formed with Q, Q; and Qf, corresponding to the necessary division factors Kd, KQ; and Kg of the source 3 of the reference voltage supplied to control the respective keys 16-18.

At the same time at the output of the filter 11 we have

and

R

and

to 5

at the output of filters 13-15, the driver of the reference voltage we have

and

0 (

and

Oi

- o - v

 XTi -

- YY- - K / 1

and

about )

and

Wow. - To

about ;

about.

h ± Q;

Q i

and about

Q ;;

where UQ is the voltage source 3 of the reference voltage.

A voltage is applied to the input of the measured voltage, and one of the voltages of the shaper 2 of the reference voltage through the measurement limit switch 1 is fed to the input of the reference voltage of the voltage converter 4 in a time interval.

Claims (2)

1. A digital voltmeter containing a measurement limit switch, the first group of inputs of which is connected to the corresponding outputs of the reference voltage driver, the reference input of which is connected to the output of the reference voltage source, and the first output of the measurement limit switch is connected to the reference voltage input of the voltage converter Editor I. Derbak Order 3716/55 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 2430934 in the time interval, the output of which is connected to the control input of the register, to the information inputs of which the corresponding 5 outputs of the counter, to the counting input of which the output of the master oscillator is connected, the outputs of the register are connected to the corresponding inputs of the indicator device, and the control The 10th input of the voltage converter into the time interval through the shaper of the integration interval of the converted signal is connected to the corresponding outputs of the counter, which is, in order to improve the measurement accuracy, temperature and time stability, a pulse shaping unit, an input filter and key, The input 20 of which is a voltage transformer bus, and the output through a filter is connected to the input voltage of the voltage converter being converted into a time interval, the corresponding 25 counter outputs are connected to the control inputs of the reference voltage driver and the pulse shaping unit, the outputs of which are connected to corresponding 30 inputs of the second group of inputs of the switch of the measurement limits, the second input of which is connected to the control of the 1TZIM input of the input key. 2. A voltmeter according to claim 1, which is based on the fact that the driver of the reference voltage is made on filters, switches and the driver of pulses, the inputs of which are the control inputs of the driver of the reference voltage, and the outputs are connected to the control inputs of the respective keys, the information inputs of which are combined and are the reference input of the reference voltage driver, and the output of each key is connected via a corresponding filter to the corresponding output of the voltage reference generator. Compiled by V.Mahnanov Tehred O.Solko Corrector 0.Lugov