International comparison of temperature completed. (General Developments).Key comparisons, organized by the consultative committees of the CIPM CIPM Comité International des Poids et Mesures (International Committee of Weights and Measures) CIPM Center for Integrated Pest Management CIPM Certificate in Investment Performance Measurement , have the purpose of quantitatively establishing the level of agreement between the national measurement standards of signatories to the Treaty of the Metre, forming the basis for reducing technical-barriers-to-trade, and easing access by U.S. companies to global markets. NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. staff recently completed work on Key Comparison 3 of the Consultative Committee on Thermometry thermometry Science of measuring the temperature of a system or the ability of a system to transfer heat to another system. Temperature measurement is important to a wide range of activities, including manufacturing, scientific research, and medicine. (CCT-K3), which compares realizations of the International Temperature Scale of 1990 (ITS-90) over the industrially important temperature range -189 [degrees]C to 660 [degrees]C. Within this range, measurement accuracy of temperature is critical in industrial applications that include semiconductor processing, metallurgical processing, defense applications, and meteorological me·te·or·ol·o·gy n. The science that deals with the phenomena of the atmosphere, especially weather and weather conditions. [French météorologie, from Greek monitoring. This comparison, with NIST as a pilot laboratory, had a very large number of participants--15--and required the use of delicate thermometric ther·mom·e·try n. 1. Measurement of temperature. 2. The technology of temperature measurement. ther fixed-point cells and standard platinum resistance thermometers. These factors increased the complexity of the execution and analysis of the comparison. In fact, no equivalent international comparison has ever been undertaken. NIST staff developed and characterized transfer standards, performed the extensive and demanding measurements required of the pilot laboratory, and developed appropriate statistical methods for the analysis of the comparison. The final results revealed that the NIST measurements possessed a very high level of internal consistency In statistics and research, internal consistency is a measure based on the correlations between different items on the same test (or the same subscale on a larger test). It measures whether several items that propose to measure the same general construct produce similar scores. that facilitated comparison of results from other participating laboratories. The final report of the comparison has been approved by the CCT CCT Circuit CCT Commission Canadienne du Tourisme (Canadian Tourism Commission) CCT Correlated Color Temperature CCT Common Customs Tariff (EU) CCT Certificate of Completion of Training , and an abridged version has been published in Metrologia magazine. Within these documents, the differences in the realizations of the various fixed points in this range of the ITS-90 and the uncertainties of those differences are given for the 15 standards laboratories participating in the comparison. CONTACT: Gregory Strouse, (301) 975-4803; gregory.strouse@nist.gov. |
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