Naslov
Use of precise digital voltmeters for impedance measurements

Autori
Ilić, Damir ; Leniček, Ivan

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

Izvornik
Proceedings of the 13th IMEKO TC4 Symposium / Kayafas, E. ; Loumos, V. - Atena : IMEKO&NTUA, 2004, 93-98

Skup
13th IMEKO TC4 Symposium

Mjesto i datum
Atena, Grčka, 29.09.2004. - 01.10.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
resistance standard ; capacitance standard ; digital voltmeter ; ac voltage

Sažetak
The traceability chain of the Primary Electromagnetic Laboratory (PEL) is presented, and the place of the resistance standard of 100 Mohm is analysed in details, as well as its construction and characteristics. Its one hundred 1-Mohm elements in parallel connection forms the 10-kohm value, and can be easily compared to the reference 10 kohm standard of PEL ; in that way its long-term drift was found to be 0, 067 ppm/day (ppm means parts per million). Furthermore, the method of comparison of 100 Mohm resistance standard by means of 100 pF capacitance standard and high-resolution digital voltmeters (DVs) is analysed, where DVs measure ac voltage of frequency close to 16 Hz in dcv range, and the mean value of one-third cycle is measured. It was found that the voltage ratio could be stable within the limits of 0, 1 ppm when the additional frequency stabilization of the ac calibrator is used.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA