Mathematical theory of measurement problems: applications. Determination and adjustment of calibration intervals for means of measurementAuthor(s): Levin S.
Issue: KIPiS 2020 #5
The experience of calibration intervals determination shows that there are several factors that may affect the results. In the following article professor S. Levin provides the detailed information concerning these factors, and demonstrates the results of the main methodological aspects of the compositional approach to determine the calibration intervals.
Mathematical theory of measurement problems: applications. «Cosmically jerk» or rang inversion — the reason for «dead end» in cosmologyAuthor(s): Levin S.
Issue: KIPiS 2020 #4
Accumulated experience in measuring instruments calibration taking into account inadequacy errors has made it possible to identify an essential factor of the «dead end» in cosmology. But strictly speaking there is no «dead end». There is usual discordance of mathematical models built basing on measurement data from various sources aggravated by violations of the conditions for statistical methods applicability when inadequacy errors of mathematical models can be no longer neglected.
KIPiS 2020 #3
2020 has caused many changes in all spheres of live. The majority of events and conferences earlier planned for this year have to be postponed for 2021. Nevertheless Rosstandart and other organizations decided to hold MetrolExpo conference but in absolutely new online format. This event got name Metrol- LIVE and was held on May 20 when the whole world was celebrating World Metrology day. Digitalization and its influence on the metrology, possible results and future prospects connected therewith became the main topics. Also it was followed by the skills contest for students where they could share their knowledge and master their skills in metrology industry.
Mathematical theory of measurement problems: applications. Catastrophically phenomenon «1985-1986», Risk management and ISO/IEC 17025–2019Author(s): Levin S.
Issue: KIPiS 2020 #3
On September 1, 2019 ISO/IEC 17025–2019 came into force. This standard describes the general competence requirements for testing and calibration laboratories. In the present article professor S. Levin unites catastrophic historical facts, risk management analysis and this standard and considers whether this interconnection is actually possible and correct.
Issue: KIPiS 2020 #2
Metrology is a fundamental science about the methods and means to reflect the physical objects nature with the help of mathematical models. And for metrology the problem of inadequacy has always been the central one. The present article by Professor S. Levin keeps very interesting centuries-old history facts that will help you to better understand this problem.
Measurements for global trade (message from the director of the BIPM and director of the BIML to World Metrology Day 2020)Issue: KIPiS 2020 #2
The theme for World Metrology Day 2020 is Measurements for global trade. And this theme was chosen to create awareness of the important role measurement plays in facilitating fair global trade, ensuring products meet standards and regulations, and satisfying customer quality expectations. Indeed more widely metrology, the science of measurement, plays a central role in scientific discovery and innovation, industrial manufacturing and international trade, in improving the quality of life and in protecting the global environment. Read the following message from Martin Milton (Director of the BIPM) and Anthony Donnellan (Director of the BIML) to World Metrology Day 2020 and get to know their opinion about the important role of precise measurements and metrology for global trade affairs.
Mathematical theory of measurement problems: applications. Once again about «reliability» in metrologyAuthor(s): Levin S.
Issue: KIPiS 2019 #5
The latest issue of «Chief metrologist» magazine for 2018 contains rather interesting discussion concerning the use of «reliability» term in metrology. Although a wide range of regulatory documents keep this term can it be considered correct in its full meaning? Present article by professor Levin S. is dedicated to this matter and will inform you of more details upon this term use.
Mathematical theory of measurement problems: applications. New «Guide OIML G 19: The role of measurement uncertainty in conformity assessment in legal metrology»Author(s): Levin S.
Issue: KIPiS 2019 #4
Discussion concerning GUM Guide unexpectedly continued in 2016 with the promised philosophical arguments of article published in 2007 as an announcement of the Guide criticizing the «inaccuracy » of measurements when type approval testing, verification and measuring instrument calibration. According to the plan the Guide was supposed to comply with ISO/IEC 17025, but the risk assessment for the «instrument cluster in the sense of statistical analysis» is beyond the scope of application. And now it is not clear whether this is in compliance with ISO/IEC 17025- 2017 where risk assessment issues came to the fore including the risk of «statistical assumptions»...
15th jubilee Forum «Precision measurements — The basis of quality and safety». On the threshold of global changes!Author(s): Afonskaya, Tatiana , Afonskiy, Alexander, Borovskaya M.
Issue: KIPiS 2019 #3
Several days prior to World Metrology Day, on May 15-17, on VDNH there was 15th Moscow International Innovation Forum and Exhibition «Precision measurements — The basis of quality and safety» held. This is the most important event for all metrologists and those who connected life with this science and its development. Evolution of the International System of Units became the crucial topic of discussion at this year event. Find more details in the present review.
Mathematical theory of measurement problems: applications. Calibration both space and terrestrial — the scale factor and measurement planAuthor(s): Levin S.
Issue: KIPiS 2019 #3
Recently calibration measuring task attracts the increasing attention of metrologists, not only because in practice calibration is made in accordance with the methods of measuring instruments verification or it is limited by the protocol of their joint measurements with the standard use. There are some other circumstances existing. Thus, as an example, calibration laboratories force to calibrate measuring instruments according to the international guidelines that in fact do not guarantee the main purchase achievement of the Federal Law «On Ensuring the Uniformity of Measurement» which is to protect the rights and legal interests of citizens, organizations and the state from unreliable measurement results… Find more details in the article written by Professor S. Levin.
Isaev L., Kalinin M.
Issue: KIPiS 2019 #1
As you know among seven main SI units the most vulnerable is kilogram since it’s a physical object made by humans and it can be destroyed or damaged. The definitions of ampere, mole, and candela depend on the kilogram definition. Over the past hundred years of comparisons the stability of the kilogram prototype nominal value in comparison to the national standards demonstrated their masses discrepancy by 50 μg. How this problem has been solved you will learn from the present article.
Mathematical theory of measurement problems: applications. The main measurement task of measuring instrument type approval testingAuthor(s): Levin S.
Issue: KIPiS 2018 #5
According to the Federal Law «On ensuring the uniformity of measurements » any measuring instrument type must be approved by means of control tests for further application in the state regulation field. Such tests should confirm the specified accuracy and the interval between verification processes. Verification methods should be also tested. For the type approval testing the identification of standardized metrological characteristics is considered the most important, and approbation is more often limited to checking the possibility of verification operations. But in fact the situation can be quite different. For more details read the present article written by Professor Levin S.F.
Mathematical theory of measurement problems: applications. Uncertainty conception — Theory of accuracyAuthor(s): Levin S.
Issue: KIPiS 2018 #4
Targets of measurement tasks form the definition of «uncertainty». At the moment the revision of Guide to the expression of uncertainty in measurement (GUM) keeps more broaden interpretation of this term but anyway the problems of uncertainty conception, model structure and definitional uncertainty, are still considered open and require more attentive investigation. Professor Levin S. shares his point of view upon this problem in his new article.
Precision measurements — The basis of quality and safety! 14th Moscow International Innovation Forum and Exhibition prior to World Metrology DayIssue: KIPiS 2018 #3
Several days prior to World Metrology Day, on May 15-17, on VDNH there was 14th Moscow International Innovation Forum and Exhibition «Precision measurements — The basis of quality and safety» held. This is the most important event for all metrologists and those who connected life with this science and its development. Constant evolution of the International System of Units is not only the theme of World Metrology Day but also one of the key topics discussed within the Forum.
Mathematical theory of measurement problems: applications. Statistical procedures of the control at high-precision measurementsAuthor(s): Levin S.
Issue: KIPiS 2018 #3
The main target of Federal Law 102 dated from June 26, 2008 «On ensuring uniformity of measurements» is to protect the rights and legitimate interests of citizens, society and the government from the negative consequences of inadequate measurement results. Therefore there should be certain procedures controlling the measurements. Professor S. Levin dedicated the present article to the statistical procedure of control at high-precision measurements
Mathematical theory of measurement problems: applications. Calibration space both terrestrial — metrological and scientific deadlock?Issue: KIPiS 2018 #2
The experiences made starting from 1986 up to 2014 showed that the estimations of the fundamental gravitational constant «G» have got different results. That could happen due to the incorrect confidential intervals taken which caused the discrepancy between the estimations. Further on such estimation discrepancy was called «metrological and scientific deadlock». Professor Levin S. suggests to take a closer look at this problem in the present article.
Mathematical theory of measurement problems: applications. Calibration of measuring instrument — three decisions of the one measuring problemAuthor(s): Levin S.
Issue: KIPiS 2018 #1
Practicing metrologists often do not have enough examples of the reference documents use to solve their measurement tasks. One of such tasks is the calibration of measuring devices. The difficulty is caused by National State Standard 8.820–2013 which equaled different accuracy standards like uncertainty of measurement, precision and inaccuracy. In practice the same measuring methods may bring to various calibration results. In the present article professor Levin S. suggests three different solutions for one measurement task.
Mathematical theory of measurement problems: applications. Calibration or verification? «Problems» of inaccuracy to uncertainty calculationAuthor(s): Levin S.
Issue: KIPiS 2017 #6
This year on April 19 there came Government resolution ¹737 «Concerning the confirmation of the Strategy to assure the measurement uniformity in Russian Federation up to 2025». As a result Federal Service for Accreditation set the requirement for the calibration laboratories to express the measurement capabilities through «uncertainty» when forming the accreditation scopes. The present article describes the influence it may cause to the measurement results and the possible problems that may appear when calculating the inaccuracy to uncertainty…
Mathematical theory of measurement problems: applications. Metrology: definitions and terms, phraseological units and catachresesAuthor(s): Levin S.
Issue: KIPiS 2017 #1, KIPiS 2017 #2
Nothing characterizes the science more than its terminology. And at the same nothing causes so many discussions like terms and definitions. In fact incorrect definitions in the metrology lead to the incorrect determination of the measurement task sometimes resulting in the wrong and nonsense method choice to solve this task. More details concerning this problem you will find within the present article written by Professor S. Levin.
Mathematical theory of measurement problems: applications. Measurement task to check the compliance of measuring instruments to the specified requirementsAuthor(s): Levin S.
Issue: KIPiS 2016 #6
Test procedures of measuring instruments consider the meeting of a set of conditions and terms as well as the parameters selection. Read the present article to know about the particular problems that can be faced while checking the measuring instrument compliance, how to solve this measurement task and also how to ensure the correctness of the test results.
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