The applicability of the ITS-90 method to platinum resistance thermometers of different purity

The static characteristics of platinum resistance thermometers with different platinum purities were measured. It is shown that in the 0–420°C range the ITS-90 method gives an error of less than 0.01°C, while in the 0–230°C range the error is less than 0.006°C. __________ Translated from Izmeritel’naya Tekhnika, No. 12, pp. 33–36, December, 2006.     

The use of international standards in the new national standard on the procedure for checking working resistance thermometers

Proposals for a new Russian standard on the procedure for checking working resistance thermometers, connected with changes in the international standards, in particular, in the last edition of the IEC 60751 standard, are considered. The need for a transition when checking from an estimate of the error to an estimate of the uncertainties is demonstrated. __________ Translated from Izmeritel’naya Tekhnika, No. 9, pp. 47–51, September, 2007.     

A method for indirect measurements of the parameters of platinum resistance thermometers at the freezing point of silver

A procedure for reproducing the International Temperature Scale ITS-90 for solving special measurement problems is considered.Translated from Izmeritelnaya Tekhnika, No. 11, pp. 46–49, November, 2004.     

A simple engineering calibration for platinum resistance thermometers in the temperature range 4.2 K - 273 K

We describe how a simple two-point calibration of a platinum resistance thermometer can be used to deduce the resistance-temperature relationship in the range 4.2 K ? T ? 273 K. This relationship is established by comparing the unknown thermometer to two carefully calibrated platinum resistance thermometers. This technique produces an accuracy of (0.1 – 0.3) K. This accuracy should be adequate for many engineering applications.     

Investigation of the interpolation relations for a platinum resistance thermometer over narrow temperature ranges

The systematic difference between the Callendar—Van Dusen function and the ITS-90 polynomial for working platinum resistance thermometers with different values of W(100) is analyzed and it is shown that this difference is not related to the purity of the platinum over a wide range of values of W(100), and depends considerably on the temperature range. A method of calculating the standard relations for platinum resistance thermometers is proposed based on a quadratic approximation of the ITS-90 function, and a method of constructing individual functions for platinum resistance thermometers in the 0–230°C range using a single calibrated point in addition to 0°C is described.Translated from Izmeritelnaya Tekhnika, No. 11, pp. 39–43, November, 2004.This is the last of the series of papers (of which the first was published in Izmeritelnaya Tekhnika No. 9, 2004), prepared from the proceedings of the Second All-Russia Conference on Problems of Thermometry Temperatura-2004, held in Obninsk in March 2004.     

Thermal impedance of thick-film resistance thermometers below 0.2 K

Contributions to the thermal impedance of thick-film resistors (TFRs) are discussed. Measurements of the heat flow along the resistance layer, through the substrate and through the glass overcoating, are presented for commercial resistors mounted on a copper plate in the 30–170 mK temperature range. Because of the relatively good thermal conductivity of the film material (three orders of magnitude higher than that of alumina), the contribution to the heat flow of the resistance layer is never negligible in spite of the thinness of the latter. Suggestions are given for the best mounting of the TFRs as low-temperature thermometers. Less conventional uses of TFRs as thermometers in bolometers are also considered.     

Fixed point on the basis of Ga-In eutectic alloy for rapid monitoring of thermometers and temperature measurement systems

A fixed point based on Ga-In eutectic alloy with a phase transition temperature of 288.798 K (15.648°C) is proposed and studied. This temperature makes it possible to accomplish a phase transition without the use of external thermostat devices. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 26–30, May, 2008.     

基于VBA的工业铂电阻半自动校准系统

介绍一种在Excel内嵌的VBA平台上开发的工业铂电阻半自动校准系统,对系统的工作原理及软件流程进行了论述,通过程序实现了判断恒温槽温场变化、自动记录铂电阻阻值数据、在校准(检定)完成后对铂电阻进行自动等级判定、自动生成原始记录和证书等功能,解决了以往工业铂电阻的校准(检定)工作中遇到的数据量大,后期处理繁琐的问题,具有推广价值。     

On the stability of carbon glass thermometers cycled at low temperatures under high magnetic fields

We report on the reliability of three carbon glass thermometers used in the temperature range 4.2 K – 50 K under high magnetic field conditions.In two of the three sensors we observed a serious lack of reproducibility (1.5 K at 25 K). These results indicate that in experiments requiring precise temperature measurements in the range 20 – 30 K, it is necessary to perform regular calibrations of carbon glass thermometers versus secondary standards such as platinum or germanium resistors.     

红外体温计示值修正值测得值的不确定度评定

本文选用二等标准铂电阻温度计作为标准器,恒温槽黑体作为黑体辐射源,对红外体温计进行了示值修正值的测量,分析了测量误差的来源和影响因素,并对测得值进行了不确定度评定。     

低温下接触界面热阻的实验与模拟研究

在20-300 K和1.20-4.28 MPa范围内,分析温度和加载压力对铜-不锈钢接触界面热阻的影响,并进行回归分析和仿真研究.完全二次型模型与铜-不锈钢接触热阻实验结果吻合较好,最大相对误差为7％.仿真结果表明,在温度低于150 K时温度和压力的耦合对接触热阻的影响比较明显.     

精密铂电阻温度计的校准方法

介绍了精密铂电阻温度计的特性及0~660.323℃温度范围内精密铂电阻温度计的校准方法。提出对测量上限温度高于450℃的精密铂电阻温度计可参考使用说明书要求进行上限温度退火,进行定点法校准时,可采用熔化点温坪替代凝固点温坪,对于无法进行定点法校准的精密铂电阻温度计,可采用比较法校准及采用简化公式计算各项参数的可行性,同时指出自热效应对测量的影响。     

Development of Criteria for Ranging Multiparameter Alternatives

New criteria have been developed for ranging alternatives, taking into account both values of parameter estimates and their spread, and possessing a higher sensitivity compared with those presently existing.     

A system for recording,evaluating, and representing the results of tests for the software SAPR of aircraft pilotage-navigation complexes

Translated from Izmeritel'naya Tekhnika, No. 1, pp. 30–31, January, 1992.     

The Realization of Fixed Points of the Temperature Scale in Small-Size Ampoules

Results of an investigation of small-size ampoules of the fixed points of gallium and indium are described. It is concluded that they can be used as an inexpensive standard means of measuring temperature.