SU1372240A1 - Method of measuring parameters of electric signal - Google Patents

Abstract

The invention can be used for high-precision measurements of analog signals, in particular voltages. The aim of the invention is to improve the accuracy of measurements. According to this method, as a result of sequential measurement of the monitored and reference signals, the magnitude of the larger signal is closer to the smaller one chosen for the reference signal. In each subsequent cycle, a larger signal is divided by the factor generated on the basis of the previous measurement cycle. The measurement cycles are repeated until the desired amount of error is obtained. The device implementing the method contains a controlled divider 1, a switch 2, a source 3 of an exemplary signal, an analog-to-digital converter 4, a computing unit 5, which can be made on the basis of serial microprocessors or micro computers. The sequence of operations performed by the proposed method is given in the description and the claims. 1 il. (L

Description

7

The invention relates to the field of measurement technology and can be used for high-precision measurements of analog signals, in particular voltages.

The purpose of the invention is to improve the measurement accuracy.

According to the proposed method, as a result of sequential measurement of the monitored and reference signals, the magnitude of the larger signal is successively approximated to the smaller one chosen for the reference signal. In each subsequent cycle, the larger signal is divided by the coefficient formed on the basis of the previous measurement cycle, and the magnitude of the measured signal is taken as the magnitude of the measured signal, ensuring the specified accuracy, if the reference signal is taken as the reference, and the opposite value, otherwise.

The drawing shows the block diagram of the device that implements the proposed method.

The device contains a controlled divider 1, to the input of which, through the switch 2, the input signal X ;, or a sample signal, for example, single, is fed from sample source 3, the output of the controlled divider 1 is connected to the input of a nonlinear analog-digital converter 4, the output of which is connected to the input of the computational unit 5, and the outputs of the computational unit 5 are connected to the control inputs of the controlled divider 1 and the switch 2. The computational unit 5 can be executed both on the basis of serial microprocessors and microcomputers.

The method is carried out as follows.

In the initial state, the controlled divisor 1 has a division factor of one. The measurement cycle begins by connecting switch 2 to the signal from computing unit 5 to the input of controlled divider 1 of the measured analog signal, which is then converted by non-ideal analog-digital converter 4 and the resulting value ti is stored in computing unit 5. After that, the controlled divider 1 is input switch 2 is connected to the signal from the computing unit 5 exemplary

signal from sample source 3, which is also converted by analog-to-digital converter 4, and the obtained value of NO is stored in the computing unit 5.

The obtained values of Nj and N in the computing unit 5 compare and form the ratio of the larger to the smaller — the reference value of N-, after which the computing unit 5 sets the division factor k, the controlled divider 1, equal to the generated ratio. Then the measured signal is connected by the switch 2 according to the signal of the computing unit 5 to the input of the controlled divider 1 and received after 20

no analog signal

 - --i- k.

convert the analog-to-digital converter 4, memorize the obtained value of N2 and compare it in the computing unit 5 with the value of the reference signal Np. In this case, the measurement cycles are repeated until the required error is obtained, and the division ratio of the controlled divider 1 is set by the computing unit 5 based on the results of the previous measurement cycle according to an algorithm that successively approximates the magnitude of the larger signal to the smaller one — the reference signal, for example.

to

li. c. one

L 2 2 of the measured signal

For the value of 0

five

take the value

the division ratio of the last measurement cycle, k x; when taken as a reference reference signal (Np N), otherwise () the value inverse to the division ratio of the last measurement cycle is taken as the value of the measured signal; .

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Claims (1)

Invention Formula 0 The method of measuring the parameters of an electrical signal, which transforms the measured parameter into a digital equivalent and fixes the obtained value, converts the corresponding parameter of an exemplary electric signal to the digital equivalent, and records the obtained value, judging the value of the digital equivalents the measured parameter of the electrical signal, characterized in that, in order to improve the measurement accuracy, an electrical signal is determined that has a lower digit value equivalent parameter and the second electrical signal is divided by a factor equal to the ratio of the digital equivalents of the measured parameter of the second and the reference signal, the measured parameter of the received signal is converted into a digital equivalent, its value is compared, compared with the digital the equivalent of the measured parameter of the reference signal, determine the reliability measurements, continue until the specified error is obtained; electric signal, in each of which the division factor is set based on the result of comparing digital equivalents in the previous cycle so as to ensure a consistent approximation of the signal with a large digital equivalent value to the reference, and the division value of the last conversion cycle is taken as the measured value of the electrical signal parameter when received as a reference exemplary electrical signal or the reciprocal of the division ratio of the last cycle otherwise,