SU1394149A1 - Method of measuring physical quantities - Google Patents

Abstract

The invention makes it possible to increase the accuracy in the measurement range of a measured physical quantity from 0.8 to 1.0 of its maximum possible value by eliminating multiplicative tests that make it difficult to implement them for measuring, for example, non-electrical quantities and powerful electrical signals. For this, an initial measurement of the physical quantity itself is made, then the physical quantity is divided into two components, additional measurements are made of the first component, the second component and the second cell together with the standard measure. The desired value of the physical leg is determined on the basis of these measurements by the formula given in the description text. 1 il. I (L

Description

: x

iU

F

The invention relates to measuring-Gelnoy technique.

I The purpose of the invention is to increase the accuracy in the range of variation of the measured physical quantity from 0.8 to 1.0 of its maximum possible value.

The method is as follows. ; The value of physical magnitude is measured: X, the measurement result of Y is memorized. The physical quantity X is divided into two components X and X and the measurements of the first component, the second component and the second component with an exemplary measure M of the physical quantity are made, the results of these measurements Yj, Y, and Y are respectively stored.

The desired value of a physical quantity is determined by the formula

x.2 | .--- | h-K -. „. I4 13

The drawing shows a block diagram of a device implementing the proposed method.

The device contains the first, 1 and second 2 keys, the inputs of which are connected to the input of the device. The output of the key 2 is connected to the input of the separating unit 3, the first and second outputs of which are connected to the inputs of the third and fourth 5 keys. The first input of the adder 6 is connected to the output of the key 5, the second input through the fifth key 7 to the source 8 of the exemplary measure, and the output to the third input of the meter 9. The first and second inputs of the meter 9 are connected to the outputs of the keys 1 and A, respectively, and the output through computing unit 10 - to the outputs of the device.

The device works as follows.

The measurement process consists of four cycles. In the first cycle, key 1 is closed, and keys 2, 4.5, and 7 are open. The measured value X itself is directly applied to the input of the measuring device 9, and the result of measuring the Y is formed at the output. In the second cycle, the keys 2 and A are closed, and the keys 1,5 and 7 are open. The first component X is fed to the input of the meter 9, and the result of the measurement Yj is formed at its output. In the third measurement cycle, the keys 2 and 5 are closed, and

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keys 1, 4 and 7 are open. At the input, the meter 9 is supplied with the second component Xj, and the result is the result of the measurement Yj. In the fourth measure, the keys are closed 2, 5 and 7, and the keys 1 and 4 are open. The adder 6 summarizes the second component Xj with the signal of the exemplary measure M, the meter 9 is formed at the output of the measurement result in the fourth clock cycle Y. If the calibration characteristic of the meter 9 is Y a + bX, then the solution of the system of equations is based on the algorithm of the computing unit 10

Y,

a + bX; a + bx;

+ Bx

+

2

b (X.j +

M)

where X is the measured value; a and b are constant coefficients.

The sought value of the physical quantity X is calculated by block 10 using the formula;

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thirty

X. -2Xii4: Xi-. . M.

Y.4- Y

Claims (1)

Invention Formula The method of measuring physical quantities, which consists in measuring the physical quantity X and the result of this measurement Y is memorized, forming an exemplary measure M of a physical quantity, characterized in that, in order to improve the accuracy in the range of variation of the measured physical quantity from 0.8 to 1.0 of its maximum possible value, the physical quantity is divided into two components, after which the first component of the physical quantity is additionally measured, the second component of the physical quantity is measured, the second component is measured A physical measure with an exemplary measure, the results of these measurements Y, Y, and Xj are respectively stored, and the desired value of the physical quantity is calculated by the formula 2Y, - Yi- Y, .... iM.