Variability sources of DC voltage–current measurements in the study of TiO2-based varistors

✍ Scribed by M.A.A. Santana; F.S.N. dos Santos; V.C. Sousa; Q.S.H. Chui

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 319 KB
• Volume: 41
• Category: Article
• ISSN: 0263-2241
• DOI: 10.1016/j.measurement.2008.03.006

✦ Synopsis

TiO 2 -based ceramic varistors have called attention due to their low voltage characteristics. Metallic ions with +5 valence have been used as additives for the sintering of TiO 2 as they allow the increase of the electric conductivity of titanium dioxide. In this work, an experiment was carried out to study the influence of Ta 2 O 5 and Cr 2 O 3 addition on the electrical properties of TiO 2 varistors and identify the various sources of uncertainties associated with the measurement results of current and voltage. The EA-4/02 standard (Expression of the Uncertainty of Measurement in Calibration) was used and it was demonstrated the traceability chain of the variables: pressure, temperature, humidity, voltage, current and electric resistance.