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PUBLICATIONS

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

Published

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

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Keywords

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

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 October 7, 2025)

Issues

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Created June 1, 2009, Updated February 19, 2017
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