DEVELOPMENT OF METHODOLOGICAL ERRORS ASSESSMENT METHOD CALIBRATION ELECTRIC MEASURING DEVICES OF CURRENT RECTANGULAR WAVE FROM THE «MEANDER» TYPE

Authors

  • V. Mosharenkov

DOI:

https://doi.org/10.26906/SUNZ.2020.3.041

Keywords:

rectangular signals, electromeasuring devices of alternating current, methodological error, calibration

Abstract

The aim of the article is to develop a method for estimating methodological errors in calibration of AC electrical measuring instruments with rectangular signals. This article deals with the applied aspects of estimation of methodological errors in calibration of alternating current electrical measuring instruments with rectangular «meander» signals for two typical types of instrument circuits, without compensation and with compensation. Mathematical models of calibration of electromagnetic measuring devices with signals of rectangular meander type and conditions of its equivalence to classical calibration of sine wave signals were obtained. It is shown that the introduction of a correction factor for the calibration of electromagnetic measuring devices with signals of rectangular shape of the type "meander" is possible provided that its amplitude is equal to the mean square value of the sinusoidal signal in the corresponding markings of the scale of the device. These models and equivalence conditions are also valid for electrodynamic ammeters and alternating current electrical measuring instruments. According to the results of the analysis, analytical expressions were obtained for the relative values of methodological errors in the measuring circuits of the device without compensation and with compensation. The results of the analysis confirmed the possibility of using rectangular waveforms of the "meander" type for calibration of electromagnetic devices. The developed method allows to estimate the methodological errors in calibration of alternating current electrical measuring instruments using rectangular signals. The results of the analysis give analytical expressions of the relative values of methodological errors in the measuring circuits of the device. The results of the analysis confirmed the possibility of using rectangular waveforms of the «meander» type for calibration of electromagnetic devices

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Published

2020-09-11