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Performance Assessment of Resistance Ratio Bridges used for the Calibration of SPRTs

Published

Author(s)

Gregory F. Strouse, K D. Hill

Abstract

Automatic balancing dc and ac resistance ratio bridges are the primary measurement devices used by National Measurement Institutes for the calibration of standard platinum resistance thermometers (SPRTs) on the International Temperature Scale of 1990 (ITS-90). Performance assessment of these resistance ratio bridges is critical to the determination of both the uncertainties of the measurements and for identifying if a resistance bridge is exhibiting non-compliant behavior. NIST and NRC investigated the performance of 18 resistance ratio bridges consisting of 14 ASL F18s, 2 ASL F900s, and 2 MI 6010Bs. The assessment techniques included the use of an AEONZ resistance bridge calibrator, an ASL ratio test unit, and complements checks. Additionally, the possible effects from using different ac frequencies were investigated. This paper presents the methods of assessment employed, indicates the performance results obtained for the 18 resistance ratio bridges, describes the determination of measurement uncertainties, and assesses the contribution to the calibration uncertainty of SPRT measurements at ITS-90 fixed points.
Proceedings Title
Eighth International Temperature Symposium | 8th | Temperature: Its Measurement and Control in Science and Industry; Volume Seven | AIP
Volume
684
Issue
Pt. 1
Conference Dates
October 21-24, 2002
Conference Title
AIP Conference Proceedings

Keywords

ac Resistance Ratio Bridge, dc Resistance Ratio Bridge, ITS-90, Ratio Bridge Non-Linearity, Ratio Bridge Ratio Accuracy, Ratio Bridge Testing, Resistance Ratio Bridge, SPRTs

Citation

Strouse, G. and Hill, K. (2003), Performance Assessment of Resistance Ratio Bridges used for the Calibration of SPRTs, Eighth International Temperature Symposium | 8th | Temperature: Its Measurement and Control in Science and Industry; Volume Seven | AIP, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830788 (Accessed June 20, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created October 1, 2003, Updated February 17, 2017