Naslov
Measurement of AC voltages with digital voltmeters

Autori
Ilić, Damir ; Butorac, Josip

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the XVI IMEKO World Congress, vol. X / Daponte, Pasquale ; Michaeli, Linus ; Durakbasa, M. N. - Beč : Austrian Society for Measurement and Automation, 2000, 185-190

Skup
XVI IMEKO World Congress

Mjesto i datum
Beč, Austrija, 25.09.2000. - 28.09.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Digital voltmeter; RMS value; phase angle

Sažetak
A principle of using high-resolution digital voltmeters (DVs) Hewlett-Packard 3458A for the measurement of AC voltages in DCV range is described. The method of approximate synchronous sampling is used, having only one sample per cycle of a working frequency close to 16 Hz, when the mean value of one-third cycle is measured. The beginning of integration is shifted for the same interval for every subsequent period of the measured voltage. From the samples, the RMS value of the "derived" sine is determined using subsequent numeric synchronisation. The phase angle of the first sample of the "derived" sine is calculated as regression line coefficient. To ensure accurate phase difference measurement between two voltages, a synchronised triggering is used. A method for the determination of the difference between the sampling frequency of two DVs and the main frequency is presented. For the voltage ratio and phase difference measurements, the uncertainties of 0, 1 ppm and 0, 1 microradian respectively were achieved.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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