NCSL International Workshop & Symposium Conference Proceedings 2016最新文献

{"title":"Characterization of the NIST Magnetic Suspension Mass Comparator Apparatus and Facility ","authors":"E. Mulhern","doi":"10.51843/wsproceedings.2016.27","DOIUrl":"https://doi.org/10.51843/wsproceedings.2016.27","url":null,"abstract":"With the upcoming redefinition of the kilogram set for 2018, National Metrology Institutes are working to identify and reduce uncertainties related to the realization and dissemination of the kilogram. In the current system the kilogram is equal to the mass of the International Prototype Kilogram (IPK) with zero uncertainty. In the \"New SI\", the Watt Balance and Avogadro Experiment will use a fixed value of Planck's constant (zero uncertainty) and realize the kilogram based on that fixed value. The previous uncertainty associated with Planck's constant will essentially be transferred to the kilogram. In addition, the new realization will occur under vacuum and new sources of uncertainty in the dissemination to air will have to be accounted for. At the National Institute of Standards and Technology, the Mass and Force group is developing a unique system for disseminating the kilogram realized in vacuum to air where customers can continue their usage of calibrated masses without affect. Currently, the widely accepted method for vacuum-to-air dissemination involves making measurements in both environments and then building an empirical model to account for the sorption of particles when transferring between vacuum and air. At NIST, a magnetic suspension mass comparator (MSMC) is utilized in order to directly compare a mass in vacuum to a mass in air. In order to meet customers needs it is vital that the uncertainty in our MSMC measurement is well understood so that it can be accounted for. Contributing to the overall uncertainty are uncertainties in the measurement environment, in the suspension apparatus and in the measurement facility itself. To accurately characterize this process, the Mass and Force group has measured the gravitational gradient along the measurement axis, the vibrations of the lab floor and the ambient temperature and humidity stability of the room. Additionally, we have worked to model the stray magnetic fields emanating from the MSMC. This talk will detail the methodology and results of these characterization efforts and explain how each factor influences the final uncertainty budget.","PeriodicalId":162467,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2016","volume":"36 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":"129004228","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}