SU1273857A1 - Device for automatic correction of error of instrument transducer - Google Patents

Abstract

This invention relates to a measurement technique. It can be used for the metrological assurance of precision measuring-computing complexes and information-measuring systems. The aim of the invention is to improve the accuracy of automatic correction of transducers and simplify the device. To achieve this goal, a device containing a measuring transducer I, a switch 2, an input terminal 3, a multi-valued non-graduated measure 4 of a measured value; output terminal 5, adder 6, key 7, digital-to-analog converter 8, computing unit 9, a two-position divider 10 of the measured value, a level indicator II, a crystal oscillator 12, a divider $ fL 13 frequency, a ring divider 14 frequency, a decoder 15 , meter 16 output signal. For ungraded values of the measured value, there is only one requirement for stability during the time of the two series of measurements, which is easily achieved practically. 1 il. Yu "VI oo 00 sd

Description

The invention relates to a measurement technique, in particular to automatic error correction devices used in the metrological assurance of precision measurement computing systems and information measuring systems. The purpose of the invention is to improve the accuracy of automatic correction of measurement transducers and simplify the device.

The drawing shows a block diagram of a device for automatically correcting errors of a measuring transducer,

The device contains a measuring transducer 1, a switch 2, an input terminal 3, a multi-valued non-graduated measure 4 of a measured value, an output terminal 5, an adder 6, a key 7, a digital-to-analog converter (DAC) 8, a computing unit 9, a two-position divider 10 of the measured value , a level indicator 11, a crystal oscillator 12, a frequency divider 13, a ring frequency divider 14, a decoder 15 and an output signal meter 16, the input terminal 3 being connected to the first input of the switch 2, the output of which is connected to the input of the measuring converter Ovate 1, the second input of switch 2 is connected through a two-position divider 10 of the measured value to the output of a multi-valued non-graduated measure 4 of the measured value, the input of the decoder 15 through the series connected indicator 11, a quartz oscillator 12, a frequency divider 13, a splitter 14 of the frequency connected to the input terminal 3, the output of the measuring transducer 1 is connected to the meter 16 and the adder 6p output meter 16 output signal through serially connected computing unit 9 of the DAC 8 and the key 7 is connected to the second input of the adder 6, the output terminal 5 is connected to the output of the adder 6, the decoder 15 is connected with a multi-valued non-graduated measure 4 of the measured value, two-position divider of the measured value, switch 2, output 16 meter, computing unit 9 and key 7.

The device works in the following way.

When a measured value indicator arrives at the input terminal 3, the level indicator 11 triggers a crystal oscillator 12 that generates a pulse train with the following frequency f, From the output of the frequency divider 13, the pulses with a frequency of 0.5 Hz arrive at the input of the frequency splitter 14. Such an output frequency value is chosen with the goal that in the corresponding time interval (2 s) the output signal meter 16 measures the output value of the measurement transducer 1, the decoder 15 generates signals for controlling neither the switch 2, the two-position divider 10 of the measured value, measure 4, the output signal meter 16, the computing unit 9 and the key 7, the first pulse from the output of the ring divider

14 frequencies by means of a decoder

15 sets switch 2 to position 2, two-position | Divisor 10 of the measured value to position 1, at which its division factor is equal to one, the key is 7 n open, In this case, the input of the measuring transducer 1 receives the values of the measured value from the output multi-valued ungraded measure 4 of measurable quantity. The transfer characteristic of the measuring transducer 1 is as follows:

X - S Y + 4 (Y) 1

(one)

where X is the measured value;

Y is the value of the output signal H (V) is the error reduced to the output of the measuring transducer 1; S is the slope of the transfer characteristic of the measuring transducer 1, the error of Ч ()) can be represented as a polynomial of degree Ns

+ a

5 (2)

+ ,,, +

"Y

, Y

Claims (1)

The second pulse from the output of the annular frequency divider 14 by means of the decoder 15 is set; it inserts a multi-valued non-graduated measure 4 of the measured value into a position in which the value of the measured value at its output is X, zeroing the measuring signal 16 16 of the output signal. Then, the meter 16 of the VPSOD captures the value of the output signal of the converter 1 and enters the measurement result of Y. into the memory of the computing unit 9. With the arrival of the (M + 1) th pulse from the output of the ring divider 14, the decoder 15 sets the output of the multi-valued non-scaled measure 4, the value of the measured value X | and the output signal meter 16 fixes the corresponding value of the input signal V Computing unit 9 accumulates in the memory M the measurement results of the output signal. A course from relation (2) is obtained dissolved urav1 M |, eny, binding ungraded values of the measured values with the values of the output signal: .Y. . Then, with the arrival (M + 2) of the pulse from the output of the annular divider 14, often, the decoder 15 sets the two-position divider 10 of the measured value to position 2, at which its division factor is K. (M + 3) -th pulse sets the ungraded value measured (KY - Y,) KY, a, Y a, (KY; - Yj) With the arrival of the (2M + 3) th pulse from the output of the ring splitter 14 frequency software decoder command 15, block 9 resolves the system (5) using 2M results of measurements of the output signal, thus determining the error in measuring transducer 1, eaten to the exit. The calculation process is divided from (2M + 3) -th to (2M + 13) -th pulses, with the arrival of the (2M + 14) -th pulse from the output of the ring-frequency separator 14, the decoder 15 sets switch 2 to position 1, in which The input of the transmitter 1 is measured, the key 7 is in the closed position. At the output of the measuring transducer 1, the output signal meter 16 measures the value of the output signal V. The computing unit 9. proceeds from the previously defined coefficient 7} of the magnitude X, and the measured value K arrives at the input of the measuring transducer 1. The output value meter 16 records the output signal y and enters it into the memory of the computing unit 9. With the arrival of the (2) pulse, the decoder 15 sets the output of a multi-valued ungraded measure 4 to an ungraded value of the measured quantity X, zmeritel 16 fixes the output value output value Y, and inputs the measurement result in memory unit 9. Thus, in the memory of the computing unit 9 is accumulated 2M measurement results of the output signal. The modified ungraded values of the measured value, based on relation (2), are related to the results of measuring the output signal Y, ..., by the formulas: + ... + a "Y-a Gu K l- and Dividing system equations (3) n-: the corresponding equations of system (4), get a system from M equations with (N + 1) unknowns K, a, a ..., a: „and - l d. + a (KY. .-, -,, wn. -fa / KY / -) of the error polynomial error is determined by the digital correction code Y (Y), which is fed to the input of the DAC 8. The analogue correction value is added in adder 6 with the output signal -Y, thus correcting the error of the measuring transducer 1. There is only one requirement for ungraded values of the measured value - stability during the time of two series of measurements, which is easily achieved practically. An apparatus for automatically correcting errors of a measuring transducer, comprising terminals for connecting a measuring transducer, a switch whose output is connected to a terminal for connecting the input of a transducer, an input terminal connected to the first input of the switch, a multi-valued ungraded measure of the measured value, an output terminal, adder, the output of which is connected to the output terminal, a key, a digital-to-analog converter, a computing unit connected via an Consequently, a digital-to-analog converter and a key are connected to the first input of the adder, the second input of which is connected to the terminal dp of connecting the output of the measuring converter, characterized in that, in order to improve the accuracy and simplify the device, it is equipped with a two-position divider of the measured value, a level indicator, a crystal oscillator, a frequency divider, a ring frequency divider, a decoder, an output signal meter, a pin; the output of a multi-valued ungraded measure of the measured value is connected to the second input of the switch through a two-position divider of the measured value, the input terminal is connected to a crystal oscillator through a level indicator, the output of which is connected via a serially connected frequency divider and ring splitter to the decoder, Horoi converter connected to the input of the output meter, the output of which is connected to the computing unit, the first output of the decoder It is equal to the control input of the switch, the second output is to the control input of the two-position divisor of the measured value, the third output of the decoder is to control the secondary input of a multi-valued non-scaled measure, the fourth output is to the output signal meter, the fifth output is to the control input of the secondary one block, and the sixth - to the control input of the key.