The choice of the interpolation equation for a platinum resistance thermometer

Interpolation equations which approximate the ITS-90 method for secondary standards and operating platinum resistance thermometers are considered. Possible ways of simplifying this method by reducing the number of calibration points (which considerably reduces the calibration cost) and employing a simpler form of standard function, are shown.     

Simple bridge circuit for measuring the resistance of a platinum resistance thermometer

Measurement Techniques -     

利用EXCEL实现对标准铂电阻温度计正温段分度表的计算

本文以常用的正温段(0~419.527)℃为例,介绍了1990国际温标对该温度段参考函数的计算方法,并推导出了对SPRT分度表的计算方法以及计算公式。同时以(0~419.527)℃温度段为例,介绍了利用EXCEL的功能实现对标准铂电阻温度计正温段分度表的计算。该方法简单易行,对于不熟悉编程的客户也能够很快掌握。对于工厂广大的计量人员来讲,拿到证书,即使没有分度表,也能很快的把分度表计算出来。     

浅谈Excel和VBA在标准铂电阻温度计测温中的应用

本文简单介绍了Excel和VBA在标准铂电阻温度计测温中的应用，阐述了将Excel引入计量工作的优越性。     

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.     

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。     

Numerical estimate of the temperature measurement errors of a platinum resistance thermometer

Measurement Techniques -     

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.     

Converging on the tipping point: a diagnostic methodology for standard setting

This article discusses the strengths and weakness of the Angoff and Bookmark standard setting procedures. An alternative approach that focuses on the strengths of these procedures and adds three diagnostic indices is presented. This alternative approach is applied to three standard setting data sets and the results are discussed.     

提高铂电阻温度计测量准确度的实验方法研究

目前我国工业用A级铂电阻在0℃的最大允许误差为±0.15℃,为使铂电阻温度计误差小于0.1℃,提出了一种提高工业级铂电阻温度计准确度的方法。试验采用计算机温度自动检测系统,测温元件采用Pt100铂电阻,结果证明整个系统的测量误差在0.1℃以内,而且整体造价低,经济实用。此方法较好推广,可适用于热电阻温度计的温度测量。     

Effect of platinum oxidation on the characteristics of standard platinum resistance thermometers

Platinum oxidation in PTS-10 and PTS-25 standard platinum resistance thermometers has been studied. The experimental results show that heat treatment of a thermometer at 100–300°C can increase its resistance at the triple point of water by the equivalent of 1.5 mK. A procedure for calibration in the range 0–450°C is recommended. Translated from Izmeritel'naya Tekhnika, No. 7, pp. 41–44, July, 1996.     

Thin-film platinum resistance thermometer for use at low temperatures and in high magnetic fields

A thin-film platinum resistance thermometer (SDT101A, Tama Electric Work Company, Japan), which is available commercially, has useful characteristics for thermometry in the range of 20 to 300 K and in high magnetic fields up to 5 T. The Z function-table of this platinum resistance thermometer (PRT) was obtained experimentally. It was confirmed that SDT101A PRT would be useful in the temperature range of 20 to 300 K within a precision of ± 0.1 K. This confirmation was achieved by using a two-point calibration method with the Zfunction. The magnetoresistance of this PRT at 30 K is ≈ 1.5% for a magnetic field of 5 T, whose value is one order of magnitude smaller than that of a standard type PRT.     

Design of a platinum resistance thermometer temperature measuring transducer and improved accuracy of linearizing the output voltage

An improved method is presented for designing a temperature measuring transducer, the electrical circuit of which comprises an unbalanced bridge, in one arm of which is a platinum resistance thermometer, and containing a differential amplifier with feedback. Values are given for the coefficients, the minimum linearization error is determined, and an example is also given of the practical design of the transducer, using the given coefficients. A determination is made of the limiting achievable accuracy in linearizing the output voltage of the measuring transducer, as a function of the range of measured temperature.Translated from Izmeritel'naya Tekhnika, No. 1, pp. 48–50, January, 1995.