NCSL International Workshop & Symposium Conference Proceedings 2016最新文献

{"title":"The Influence of Measurement Uncertainty in Conformity Assessment","authors":"I-jhen Lin","doi":"10.51843/wsproceedings.2016.41","DOIUrl":"https://doi.org/10.51843/wsproceedings.2016.41","url":null,"abstract":"Measurement uncertainty plays an important role in conformity assessment. In conformity assessment, a measurement result is used to decide if an item of interest conforms to a specified requirement. For laboratories or end users in society, in order to make sure that services or supplies comply with specified requirements, conformity assessment usually has to be made after purchasing supplies or after periodic calibration of instrument. Based on ISO/IEC 17025 5.10.4.2, the uncertainty of measurement shall be taken into account when making statements of compliance. The accuracy and precision of instruments which have been used during testing or calibration process, would directly affect the measurement results. It is crucial that users shall attach importance to measurement uncertainty when making conformity assessment so that the measurement accuracy and quality could be maintained. In Taiwan, now there are approximately 1900 accredited laboratories including testing, medical, and calibration fields. The testing and calibration reports, which have been issued by TAF accredited laboratories, have been used domestically and worldwide by end users in different areas. It would cause huge impact on the society if incorrect data result has been delivered via testing or calibration reports. In this paper, we will share more detail about how TAF (Taiwan Accreditation Foundation) help and train our accredited laboratories and end users to learn about the significance of measurement uncertainty when making conformity assessment. In addition, some training courses and seminars about conformity assessment were held for assessors not only for laboratory accreditation area, but also for assessors for certification accreditation. We aimed to: (1) promote the importance of calibration and measurement uncertainty, and conformity assessment (2) provide training courses and seminars for laboratories, assessors, and end users (3) clarify ambiguous concept among measurement error, measurement uncertainty, and systematic bias (systematic error) (4) raise the quality and reliability of testing and calibration reports In this paper, we will share why, how, and what we did as well as the results about the impact on our accredited laboratories and society.","PeriodicalId":162467,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2016","volume":"1075 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116022658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unceertainty Score Card With Economic Estimations","authors":"S. Echeverría-Villagómez","doi":"10.51843/wsproceedings.2016.16","DOIUrl":"https://doi.org/10.51843/wsproceedings.2016.16","url":null,"abstract":"A continuous interest of metrologists is that of showing the economic impact of metrology in industrial and commercial processes. A number of papers and studies have been published treating this topic. This paper will present a tool developed for analysis of the technical variables involved in process control, combined with economical values of inputs and outputs, and linked by measurement uncertainty. This is a rather new, though simple approach, because it allows visualizing in a single score card the connections among the technical and economic variables involved in investment decisions. The model developed in this project is a modular tool in four layers. Below these layers are listed and later briefly described: 1. Engineering - Specifications. 2. Process - Manufacturing. 3. Measurement - Uncertainty. 4. Economic - Management.","PeriodicalId":162467,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2016","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114533883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the Test Measurand and the Profound Impact on Calibration, Verification, and Uncertainty ","authors":"J. Salsbury","doi":"10.51843/wsproceedings.2016.31","DOIUrl":"https://doi.org/10.51843/wsproceedings.2016.31","url":null,"abstract":"In September 2015 a new international standard was published that will likely have far reaching impact in the calibration and test world. This standard, ISO 14253-5, is entitled \"Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 5: Uncertainty in verification testing of indicating measuring instruments\". While this standard was developed by experts in dimensional metrology, the general concepts need to be deeply considered by anybody involved with conformance testing of any type of measuring instrument to stated specifications. This paper begins with a summary of the primary concepts in ISO 14253-5 - the definition of the test measurand and the measurement uncertainty associated with verification testing, which the standard has termed the \"test value uncertainty\". This standard is the first formal attempt internationally to define the measurand in conformance testing, and the resulting impact to uncertainty can be significant. This paper will then go beyond the scope of ISO 14253-5 and show how the same principles apply to verification testing of material measures (i.e. artifacts and standards). This paper will then carefully analyze the test measurand and discuss the broad and critical ramifications on the definitions and concepts of calibration and verification. This paper will show how many of the generally accepted notions on the differences between calibration and verification should be carefully considered, and possibly reconsidered. It is the purpose of this paper to introduce the important concepts of ISO 14253-5, evaluate the broader impact, and foster further discussion within NCSL International.","PeriodicalId":162467,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2016","volume":"8 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123522409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calibration Due Dates - Daily or End of the Month?","authors":"Harry C Spinks","doi":"10.51843/wsproceedings.2016.45","DOIUrl":"https://doi.org/10.51843/wsproceedings.2016.45","url":null,"abstract":"Much of the test equipment in-use today requires periodic calibration. This is done to ensure a high probability that the equipment will remain in tolerance by the due date or end of the calibration interval. The majority of calibration intervals are monthly with common intervals every 3 months (3, 6, 9, 12, etc.) The calibration interval is based on many factors which this paper will not address. But when, exactly, should the equipment be due? And by due calibration, we mean that it is taken out of service to be calibrated. The purpose of this paper is to examine when (specifically) the equipment is required to be removed from service for calibration. Two of the most popular methods is the day of the month (daily) and end of month due date. But which is better for you? This paper will examine the pros and cons of each method so you can decide which is best for your situation.","PeriodicalId":162467,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2016","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127249100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}