Uncertainty to harmonic measurements with DFT techniques

Marcus Vinicius Viegas Pinto, Noara Foiatto, Joao Miguel Lac Roehe, Marcos Augusto Stemmer

Abstract

The harmonic content generated by the use of non-linear loads can cause an electrical device to operate improperly. For this reason, reliable measurements of this parameter are fundamental to guarantee the results needed by the electronics industry and medical devices. The aim of this work is to describe the development of a measurement system of harmonic signals with traceability to the international system of units (DC voltage), and its uncertainty levels. The system consist a software developed in Visual Basic language based on a voltmeter with a General Purpose Interface Bus (GPIB) able to digitalize a signal with sampling rates up to 100,000 samples per second. A Discrete Fourier Transform algorithm is used to evaluate the harmonic content of the signal. The work consists of a tool for the calibration services provided by the laboratory LABELO-PUCRS, and its results indicate the best capability (uncertainty) to harmonic measurements.

Keywords

Harmonics, Calibration, Uncertainty, DFT

Download

IMEKO-TC4-2013-083.pdf

DOI

-

IMEKO TC

TC4 - Measurement of Electrical Quantities

Back to the proceedings