SU1094000A1 - Method of determination of measuring converter static error - Google Patents

Abstract

METHOD FOR DETERMINING statistically measuring ERRORS, interface converter, comprising the steps that the measuring transducer is supplied test signal is subtracted from the test signal converted to the form of its reference signal power metal sootvetstvukhtsy emoy mark which is simultaneously compared with the signal output from the sensor, and at the moment of equality of these signals, the output signal is determined by conducting a statistical analysis, characterized in that, in order to increase the accuracy spine, was subjected to statistical analysis of the signal obtained by multiplying the variable components of the test signal and the signal obtained after subtraction of previously differentiated. 1 "; about 4

Description

The invention relates to a measuring technique and can be used for automatic calibration of measuring devices. The known method is that when the output signal of the measuring device is equal to the scale being checked, the difference between the nominal value of the input signal for the scale being checked from the scale mark and the true value of the input signal ij is measured. The known method for determining the statistical error of the measuring transducer, consisting in that a test signal is supplied to the measuring transducer, is subtracted from the test signal converted to a test signal type, the reference signal corresponding to the test point, which is simultaneously compared with the signal from the output of the measuring transducer, and the moment of equality of these signals is determined by dividing the output signal by means of statistical analysis, with statistical analysis being Yergali a signal obtained by subtracting 2. A disadvantage of the known methods is their low accuracy. . The purpose of the invention is to improve accuracy. The goal is achieved by the method, which consists in that a measuring signal is supplied to a measuring transducer, the reference signal converted to the form, corresponding to a test mark, which is simultaneously compared with the signal, is subtracted from the test signal output of the measuring converter, and at the moment of equality of these signals, the output signal is determined by statistical analysis, statistical analysis signal obtained by multiplying the composition variables l yukih test signal and a signal obtained by subtracting the previously Differentiate bathrooms. Denote the instantaneous values of the test signal by X; and the signal from the output of the measuring transducer is y. Let m {x; , M {I |; y . Introduce the notation and; i); - yi Let S be equally distributed and MfS; 8j} 0 as D; equally distributed and M {th; th 11 0; Mfe; Aj} 0; y, x; + Og. The conditions mean that the errors of the test and reference, respectively, of the signals are independent and mutually independent, and that the conversion to the form of the test signal of the reference signal implements the inverse characteristic of the measuring transducer. Consider the values: (x; -xf (), ..N i, rm;, h; Obviously, 5ххЧхгМ (гхО-С5 -х;) 4х; -ХОЧх-хЛ 5хг (гх11угу) х, -х, Нч; -h) Chh-hL (y-ch;). follow in M {(xr Ok-Jj; Y3 0, i.e. Mfij-il, m xx; 3 Thus Sxv-SxyVwCU MVDfS. Consequently,) (ii, -jiL as implemented by the proposed i method. Thus, The entered operations allow an increase in accuracy with an unstable reference signal. If the test signal and the signal from the converter output are subject to a time drift, the latter relation remains valid. However, the accuracy of the 6j estimate decreases due to the unstable ionization of the x and iji signals. this error is reduced., differentiation of the signals XJ and U is carried out. The drawing shows the structure A circuit diagram of a device implementing this method. The device comprises a measuring transducer 1, a comparison block 2, a scale setting master 3, a statistical analyzer 4, a converter 5, a subtraction block 6, centering blocks 7 and 8, differentiators 9 and 10 and intelligent block 11. the input of the converter 1 is connected to the input signal bus by the first input of the subtraction unit 6 and through the serially connected block 8 and the differentiator 9 to the first input of the multiplication unit 11, the output of which is connected to the first input of the analyzer 4, the second input to connected to the output of block 2, the first input of which is connected to the output of the converter 1, and

the second input - with the output of the detector Z through the converter 5 with the second input of the block 6, the output of which is connected via the series-connected block 7 and the differentiator 10 with the second input of the block 11.

The device works as follows.

The test signal is fed to the inputs of the transducer to be turned on, which is under the influence of an external disturbance. The signal from the output of the measuring transducer 1 is fed to the input of the comparator unit 2, to the second input of which from the setpoint 3 of the scale mark a signal is received, corresponding to the point being checked, to the scale. If these signals are equal, block 2 compares statistical-ana, lyser 4 and turns it off when there are inequalities.

The output from setpoint 3 is fed to the input of converter 5, which implements the function inverse to the normalized conversion characteristic of the translatable measuring transducer 1. The output from converter 5 is fed to the negative input of the subtraction unit b, the positive input of which receives the test signal. The signal from the output of block 6 subtraction through the centering block 7, which carries out the selection of the variable component of the signal, and the differentiator 10

0 is fed to the first input of the multiplication unit 11, to the second input of which a test signal is fed through the centering unit 8 and the differentiator 9. The signal from the output of block-11 multiplication is fed to the statistical analyzer 4, which calculates the expectation of the input signal, which is the second moment of the statistical error of the measuring instrument to be turned.

The invention makes it possible to improve the accuracy of determining the statistical error of the measuring transducer.

Claims (1)

METHOD FOR DETERMINING STA „TISTIC ERROR METER-, KNOB CONVERTER, consisting in the fact that a test signal is supplied to the measuring transducer,. subtract from the test signal its reference signal converted to the form corresponding to the verified mark, which is simultaneously compared with the signal from the output of the measuring transducer, and at the moment of equality of these signals, the output signal is determined by statistical analysis, characterized in that, in order to increase accuracy, The signal obtained by multiplying the variable components of the test signal and the signal obtained after subtraction is subjected to statistical analysis. on differentiated.