Investigation of the Resistance-Temperature Properties of Platinum for Resistance Thermometry over the Range from 14 K to 90 K

Sharevskaya, D. I.; Orlova, M. P.; Belyansky, L B; Galoushkina, G A

doi:10.1088/0026-1394/5/4/001

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…2 and 3, where the baseline in all cases is the mean temperature computed for the eight thermometers of Fig. 2a If this, we think highly plausible, assumption of uncertainties in the originally assigned values of W (100 "C) is valid, it is evident that the IPTS-68 is more reproducible in the range 90 K to 273 K than On the basis of these forty-eight thermometers the IPTS-68 is not reproducible to better than * 3 mK in 4 The large apparent deviations of the four thermometers of Fig. 3a are not real, but arise from inconsistencies in transferring their calibrations to our baseline.…”

Section: Preston-thomas and Bedfordmentioning

confidence: 82%

A Note on the Reproducibility of the IPTS-68 Below 273.15 K

Bedford¹,

K²

1970

Metrologia

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The reproducibility of the IPTS-68 as determined by fortyeight thermometers is shown to be within approximately 3 mK in the range 13.81 K to 20.28 K, * 1 mK in the range 20.28 K to 54.361 K, and A 2 mK in the range 54.361 K to 90.188 K. In the range 90.188 K to 273.15 K, nine thermometers exhibit a scale reproducibility within only * 5 mK; it is believed that this figure is limited by calibration uncertainties, and that + 1 mK is more likely to be typical.

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Section: Preston-thomas and Bedfordmentioning

confidence: 82%

A Note on the Reproducibility of the IPTS-68 Below 273.15 K

Bedford¹,

K²

1970

Metrologia

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“…The thermometers that were investigated by Hoge and Brickwedde showed a spread of 7 mK between 190 and 0 C, and spread of 1.3 mK between 0 and 100 C. The six thermometers measured between 100 and 444 C had a maximum spread of 12 mK. Data which would indicate the spread of interpolated values of temperature on the IPTS 68 below C due to the variations in presently acceptable platinum wire is sparse and inadequate [11,36,44]. On the basis of existing data, Bedford and Ma [9] estimated that the IPTS-68 is reproducible to 3 mK between 14 and 20 K, 1 mK between 20 and 54 K, it 2 mK between 54 and 90 K, and 5 mK between 90 and 273 K. It should be pointed out that, in addition to unaccounted for variations in the platinum wire, a spread in the temperature values may also arise from incomplete definitions of the materials that define fixed points (e.g., their isotopic composition).…”

Section: *3 Errors Of Temperature Determinationsmentioning

confidence: 99%

Platinum Resistance Thermometry

Nicholas

White

2001

Traceable Temperatures

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“…Non-uniqueness resulting from applying our deviation function [Eq. (7)] to the resistance ratio differences among nine thermometers from references [3] and [4]. The coefficients of the deviation functions were calculated from the resistance ratio differences a t those temperatures marked with asterisks.…”

mentioning

confidence: 99%

A Proposal for a New Deviation Function in the IPTS-68 below 273 K

1975

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The resistance ratios of platinum resistance thermometers from different manufacturers are compared a t many temperatures below 375 K. These resistance ratios can be interrelated by a function with six coefficients determined from the defining fixed point calibrations by the method of least squares. We suggest that this single function could replace the four deviation functions of the IPTS-68. Non-uniqueness in the temperature scale resulting from the imperfections both of this new, and of the IPTS-68 deviation functions are discussed. An even simpler deviation function is used to calibrate thermometers in the range 90 to 273 K. Moderately precise secondary calibrations are obtained over the whole temperature range using this simpler function together with comparisons with a calibrated thermometer a t only four temperatures. We show one way of smoothing the reference function of the IPTS-68 to make it more nearly resemble a real thermometer. The new six-coefficient function is then used to relate all thermometers to this smoothed reference function.

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Investigation of the Resistance-Temperature Properties of Platinum for Resistance Thermometry over the Range from 14 K to 90 K

Cited by 5 publications

References 4 publications

A Note on the Reproducibility of the IPTS-68 Below 273.15 K

A Note on the Reproducibility of the IPTS-68 Below 273.15 K

Platinum Resistance Thermometry

A Proposal for a New Deviation Function in the IPTS-68 below 273 K

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