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Calibration of platinum resistance thermometers.Results of five years experience in calibrating about 1000 commercial platinum resistance thermometers (PRT) are reported. These PRT were relatively small and rugged, with ice-point resistances from 200 to 5000 ohms. Calibrations normalized in terms of resistance-difference ratios (Cragoe Z function) were found to be remarkably uniform for five of six different types of PRT tested, and to agree very closely with normalized calibrations of the primary reference standard type PRT. The Z function normalization cancels residual resistances which are not temperature dependent and simplifies interpolation between calibration points when the quality of a given type of PRT has been established in terms of uniform values of the Z function. Measurements at five or six well spaced base-point temperatures with Z interpolation will suffice to calibrate a PRT accurately from 4 to 900 K.
Document ID
19730057209
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sinclair, D. H.
Terbeek, H. G.
Malone, J. H.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Symposium on Temperature
Location: Washington, DC
Start Date: June 21, 1971
End Date: June 24, 1971
Accession Number
73A42011
Distribution Limits
Public
Copyright
Other

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