Transport Behavior and Characterization of Precision 1 (OMEGA) Resistors for International Comparisons

Published

June 1, 2009

Author(s)

Randolph E. Elmquist, George R. Jones, Brian J. Pritchard

Abstract

The U. S. National Institute of Standards and Technology (NIST) and the National Measurement Institute of Australia (NMIA) have recently examined two types of precision transportable 1 (OMEGA) resistors that are based on different alloys and construction principles to determine characteristics that can increase the uncertainty of international comparisons. This work focuses on standards manufactured from 1970 through 2000 by the NML, and Thomas-type resistors designed in the 1930s by James L. Thomas and manufactured commercially through about 1980. The effects of temperature, barometric pressure, humidity, power loading, and heat dissipation in oil are described in these two types of transportable wire-wound 1 (OMEGA) resistance standards, and the process of characterization of these resistors for use as transport standards is described.

Proceedings Title

Proceedings of the 8th International Seminar on Electrical Metrology

Conference Dates

June 17-19, 2009

Conference Location

Joao Pessoa

Conference Title

VIII Semetro

Pub Type

Conferences

Download Paper

Local Download

Keywords

electrical resistance standard, key comparison, temperature coefficient, power loading

Citation

Elmquist, R. , Jones, G. and Pritchard, B. (2009), Transport Behavior and Characterization of Precision 1 (OMEGA) Resistors for International Comparisons, Proceedings of the 8th International Seminar on Electrical Metrology, Joao Pessoa, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902545 (Accessed December 26, 2024)