The Derivation of the Provisional Reference Table CCT 64,<i>T</i>= f (<i>W</i>) for Platinum Resistance Thermometers for the Range from 12 to 273.15 °K: Part I. The Derivation of the Table for the Range from 12 to 95 °K

Orlova, M. P.; Sharevskaya, D. I.; Astrov, D. N.; Krutikova, I G; Barber, C R; Hayes, J. G.

doi:10.1088/0026-1394/2/1/003

Cited by 30 publications

(11 citation statements)

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“…The relationship of the analytic function of the modified table to the experimental data of Ref. [9] (which are the basis of the CCT64 table in the range 12 K to 90 K). The deviations shown here may be compared with the equivalent ones of the CCT64 table shown in Fig.…”

Section: The Cct64 Table and A Modification Of Itmentioning

confidence: 99%

“…It is obvious that thermometers calibrated elsewhere can be concluded in this programme if the scale on which they were calibrated bears a known relation to the NBS55 scale. Since the relations between national scales are now fairly well known ([17, 181, but see also test 10 below), and can also be deduced from the published work on which the CCT64 table is based [9], this has allowed us to refer the 25 non-NRC-calibrated thermometers to our common base.…”

Section: Appendix a "Experimental '' Proceduresmentioning

confidence: 99%

“…10). In this figure the comparison was made direct,ly from the experimental data for this thermometer on the NBS55 scale [9]; it should be compared with the equivalent set of points for this thermometer in Fig. 12 where the comparison was made via the MDD tables [17] calibration of this thermometer on the NBS55 scale.…”

Section: Appendix a "Experimental '' Proceduresmentioning

confidence: 99%

“…It appears that the anomaly results from inconsistencies in the corrections and reductions underlying the CCT64 table, which in turn are reflected in the MDD tables. Thus, when thermometer ID1575702 is transferred directly to our baseline via the data of Table 2 [ 9] we get a set of values of W a t the 26 temperatures plotted in Fig. 12.…”

Section: Appendix a "Experimental '' Proceduresmentioning

confidence: 99%

“…2 shows the variations in the size of the degree for the CCT64 table (above 20 K), with the experimental data on which the table is based (i.e. the reduced average of four national scales) used as the reference ; this curve, in other words, is the (rather indeterminate) The experimental points on which the CCT64 table is based [9] are used as the reference, being assumed to be the best approximation to the thermodynamic scale available. This is thus the differentiation above 20 K of Fig.…”

Section: Introductionmentioning

confidence: 99%

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Practical Temperature Scales Between 11 K and 273 K

Preston‐Thomas

Bedford

1968

Metrologia

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The International Practical Temperature Scale has a lower temperature limit of 90.18 K; measurements below this temperature are commonly made in terms of the various "national" scales. All of these scales differ significantly from the thermodynamic scale and exhibit undesirable variations in the size of the degree as a consequence; the national scales, moreover, are comparison scales, which are widely considered to be less satisfactory than scales defined in terms of fixed points and interpolating instruments. Various proposals for replacing this mixture by a single scale have been or are being developed; these are all based, in the 12 K to 90 K range, on the results of a comparison of four national scales recently carried out at Moscow and Teddington.This paper attempts to analyze the reproducibility of some of these proposed scales and their relation to the current best estimate of the thermodynamic scale. The significant lack of reproducibility found for these proposed scales below 50 K may either be tolerated, or alternatively must be reduced by further restrictions on thermometer characteristics. These proposed scales exhibit systematic variations in the size of the degree with temperature. These variations can be substantially reduced by modification of the mathematical treatment of the experimental data on which the scales are based; one such modification is presented here.Further analysis of the behavour of current and proposed scales will be enormously facilitated if the results of additional, highly accurate comparisons over wide temperature ranges and involving many types of thermometers become available.* The CCT64 table ([4] and section I11 below) is an analytical function of resistance ratio against temperature (for a hypothetical platinum resistance thermometer) based on five determinations, from four laboratories, of the thermodynamic scale. The resistance ratio W of a thermometer is its resistance at temperature T divided by its resistance a t the ice point (273.15 I().

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Section: The Cct64 Table and A Modification Of Itmentioning

confidence: 99%

Section: Appendix a "Experimental '' Proceduresmentioning

confidence: 99%

Section: Appendix a "Experimental '' Proceduresmentioning

confidence: 99%

Section: Appendix a "Experimental '' Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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