Pub Date : 2020-03-28DOI: 10.51843/wsproceedings.2017.07
S. Giblin, J. Tompkins
New technology, the ultra stable low-noise current amplifier and the electron pump, provide new methods for making traceable measurements of small DC electric currents. We review four traceability routes for small current measurements and discuss the merits of each one. We present three case studies of small current calibrations, highlighting the role of noise and drifting instrument offsets. We show how the Allan deviation is used as a statistical tool for designing a calibration cycle to correctly eliminate drifting instrument offsets from calibration data. We also present a simplified noise model for a low-current ammeter which predicts a lower limit to the achievable statistical uncertainty in a calibration.
{"title":"From Counting Electrons to Calibrating Ammeters: Improved Methodologies for Traceable Measurements of Small Electric Currents ","authors":"S. Giblin, J. Tompkins","doi":"10.51843/wsproceedings.2017.07","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.07","url":null,"abstract":"New technology, the ultra stable low-noise current amplifier and the electron pump, provide new methods for making traceable measurements of small DC electric currents. We review four traceability routes for small current measurements and discuss the merits of each one. We present three case studies of small current calibrations, highlighting the role of noise and drifting instrument offsets. We show how the Allan deviation is used as a statistical tool for designing a calibration cycle to correctly eliminate drifting instrument offsets from calibration data. We also present a simplified noise model for a low-current ammeter which predicts a lower limit to the achievable statistical uncertainty in a calibration.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133422873","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}
Pub Date : 2017-08-31DOI: 10.51843/wsproceedings.2017.29
G. Harris, Flora Mercader, Adriana Veraza, Salvador Echeverría Villagómez
2016 was an exciting year for international collaboration on metrology education and training. This paper provides a 3-part look at how a Fulbright Specialist grant supported collaboration between the United States and Mexico. Part 1 describes the experience of Georgia Harris (NIST)as a Fulbright Specialist, from the application process to the implementation activities in Mexico and shares insight about lessons learned and benefits to NIST. In Part 2, Flora Mercader and Adriana Veraza describe the application process within the University to obtain approvals for the grant, the implementation process, how additional parties were engaged for participation, some immediate benefits, some expected long-term impacts, and lessons learned. Part 3 includes Salvador Echeverria's description of CENAM’s involvement in the courses conducted at the University as well as the sessions held at CENAM, immediate benefits that were observed, and provides insight for ongoing collaboration for metrology education and training in Mexico. Recommendations and additional ideas for international collaboration and future work on measuring the impact of collaborative efforts are proposed.
{"title":"Metrology Outreach and Training: A Fulbright Experience in Mexico","authors":"G. Harris, Flora Mercader, Adriana Veraza, Salvador Echeverría Villagómez","doi":"10.51843/wsproceedings.2017.29","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.29","url":null,"abstract":"2016 was an exciting year for international collaboration on metrology education and training. This paper provides a 3-part look at how a Fulbright Specialist grant supported collaboration between the United States and Mexico. Part 1 describes the experience of Georgia Harris (NIST)as a Fulbright Specialist, from the application process to the implementation activities in Mexico and shares insight about lessons learned and benefits to NIST. In Part 2, Flora Mercader and Adriana Veraza describe the application process within the University to obtain approvals for the grant, the implementation process, how additional parties were engaged for participation, some immediate benefits, some expected long-term impacts, and lessons learned. Part 3 includes Salvador Echeverria's description of CENAM’s involvement in the courses conducted at the University as well as the sessions held at CENAM, immediate benefits that were observed, and provides insight for ongoing collaboration for metrology education and training in Mexico. Recommendations and additional ideas for international collaboration and future work on measuring the impact of collaborative efforts are proposed.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129946026","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}
Pub Date : 2017-08-12DOI: 10.51843/wsproceedings.2017.43
Wei Ren, T. Doiron, J. Stoup, E. Stanfield
The National Institute of Standards and Technology (NIST) Dimensional Metrology Group (DMG) develops and delivers unique and critical high-value dimensional measurements that promote industry innovation, ensure product quality, and are not commercially available. In some cases, we need to use multiple measuring systems to provide our customers with the needed measurement results. This paper is the story of one of these measurements that involved a number of different instruments and is typical of the complexity of many of our customer requests. Recently, NIST provided a measurement solution for characterizing the gap width of a new biotechnology absorbance spectrometry standard reference material (SRM). This SRM is a reduced path length validation absorption standard for Ultraviolet (UV) visible spectroscopic measurements. The SRM consists of a series of very small rectangular glass containers called cuvettes and has been developed for the biotechnology community’s daily measurements of samples where the sample amount available is very limited: typically, samples include DNA, RNA, or an antibody. Identification of the exact substance by spectrometry measurements is based on how the substance absorbs light. The dimension of the gap between the inside walls of the cuvette is a critical characterization, therefore measurement of the gap width with low uncertainty is required.
{"title":"Characterization of the Dimensions of Internal Gap in a Glass Artifact Using a Laser Triangulation Probe","authors":"Wei Ren, T. Doiron, J. Stoup, E. Stanfield","doi":"10.51843/wsproceedings.2017.43","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.43","url":null,"abstract":"The National Institute of Standards and Technology (NIST) Dimensional Metrology Group (DMG) develops and delivers unique and critical high-value dimensional measurements that promote industry innovation, ensure product quality, and are not commercially available. In some cases, we need to use multiple measuring systems to provide our customers with the needed measurement results. This paper is the story of one of these measurements that involved a number of different instruments and is typical of the complexity of many of our customer requests. Recently, NIST provided a measurement solution for characterizing the gap width of a new biotechnology absorbance spectrometry standard reference material (SRM). This SRM is a reduced path length validation absorption standard for Ultraviolet (UV) visible spectroscopic measurements. The SRM consists of a series of very small rectangular glass containers called cuvettes and has been developed for the biotechnology community’s daily measurements of samples where the sample amount available is very limited: typically, samples include DNA, RNA, or an antibody. Identification of the exact substance by spectrometry measurements is based on how the substance absorbs light. The dimension of the gap between the inside walls of the cuvette is a critical characterization, therefore measurement of the gap width with low uncertainty is required.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121401547","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.22
E. Auden
Abstract: We present the uncertainty analysis for an electric field mill calibration system used at the Sandia Primary Standards Laboratory. The uncertainty analysis incorporates contributions from DC voltage supplied by a high voltage amplifier; the distance between an electrically isolated charge plate and the ground plate of a stainless steel test structure; type A measurement uncertainty; and uncertainty associated with operator variation, including cable arrangement, electrical connections, and the angle at which the field mill is loaded into the test structure.
{"title":"Uncertainty Analysis of an Electric Field Mill Calibration System","authors":"E. Auden","doi":"10.51843/wsproceedings.2017.22","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.22","url":null,"abstract":"Abstract: We present the uncertainty analysis for an electric field mill calibration system used at the Sandia Primary Standards Laboratory. The uncertainty analysis incorporates contributions from DC voltage supplied by a high voltage amplifier; the distance between an electrically isolated charge plate and the ground plate of a stainless steel test structure; type A measurement uncertainty; and uncertainty associated with operator variation, including cable arrangement, electrical connections, and the angle at which the field mill is loaded into the test structure.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"19 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":"127737439","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.16
Roberto Benitez
Nowadays, inter disciplinarity is a common characteristic in many work fields leading to the creation of work teams with the capacity of performing their duties and collaborating with people from other areas of study. The aim of this project is to remark the importance of the linking between Metrology and Biomedical Engineering (BE), so the combination of both fields can enlarge the useful life of medical devices by developing new methods and technologies to provide preventive maintenance and calibration of biomedical equipment. Since medical staff hugely depends on device measurements and displays, it creates a bigger uncertainty that only a team familiar with both metrology and biomedical knowledge can work on. For this, an important linking on BE undergraduate and graduate students along with a Calibration Laboratory is formed to achieve the demanding projects from health industry. To quantify and qualify the interest and knowledge of BE students, a total of 40 students were surveyed on a period of 5 days. Promising results were shown regarding on good basic knowledge of metrology concepts and encouraging interest by 60% of students. With these results, we can assure most students are willing to learn about metrology applied in the health industry for their consideration that it would bring a better and accurate performance of medical devices. Results showed a 65% of interest on including courses about metrology in their career curriculum. ETALONS -Calibration Laboratory- has already begun to recruit undergraduate students for the opportunity of internships, as well as participating along with Tecnológico de Monterrey (ITESM) for seminaries, congress conferences, metrology workshops, etc. On the other hand, seeing the promising interest of BE students for metrology, ETALONS has decided to propose a topic course for the BE curriculum on metrology focused on health industry as well as a project for the Innovation Week (Semana i) that ITESM carries out every year internally. According to this activities, students can have the convenience to learn, work and apply their knowledge on a company specialized on metrology and calibration services with a special department focused on BE.
如今，跨学科是许多工作领域的共同特征，这导致了工作团队的建立，这些团队有能力履行自己的职责，并与来自其他研究领域的人合作。该项目的目的是指出计量学和生物医学工程(BE)之间联系的重要性，因此这两个领域的结合可以通过开发新的方法和技术来提供生物医学设备的预防性维护和校准，从而扩大医疗设备的使用寿命。由于医务人员在很大程度上依赖于设备测量和显示，这就产生了更大的不确定性，只有熟悉计量学和生物医学知识的团队才能解决这个问题。为此，在BE本科生和研究生之间建立了一个重要的联系，并形成了一个校准实验室，以实现健康行业的苛刻项目。为了量化和确定BE学生的兴趣和知识，共对40名学生进行了为期5天的调查。在计量概念的基础知识和鼓励60%的学生的兴趣方面显示出良好的结果。有了这些结果，我们可以保证大多数学生都愿意学习计量在健康行业的应用，因为他们考虑到这将带来更好、更准确的医疗器械性能。结果显示，65%的学生有兴趣在他们的职业课程中加入计量课程。ETALONS -校准实验室-已经开始招收本科生实习机会，并与Tecnológico de Monterrey (ITESM)一起参加神学院，大会会议，计量研讨会等。另一方面，看到BE学生对计量学的浓厚兴趣，ETALONS决定为BE课程提出一个以健康行业为重点的计量主题课程，以及ITESM每年内部开展的创新周(Semana i)项目。通过这些活动，学生们可以方便地在一家专门从事计量和校准服务的公司工作，并将他们的知识应用到一个专门从事BE的部门。
{"title":"Relationship between Biomedical Engineering and Metrology for Project Development","authors":"Roberto Benitez","doi":"10.51843/wsproceedings.2017.16","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.16","url":null,"abstract":"Nowadays, inter disciplinarity is a common characteristic in many work fields leading to the creation of work teams with the capacity of performing their duties and collaborating with people from other areas of study. The aim of this project is to remark the importance of the linking between Metrology and Biomedical Engineering (BE), so the combination of both fields can enlarge the useful life of medical devices by developing new methods and technologies to provide preventive maintenance and calibration of biomedical equipment. Since medical staff hugely depends on device measurements and displays, it creates a bigger uncertainty that only a team familiar with both metrology and biomedical knowledge can work on. For this, an important linking on BE undergraduate and graduate students along with a Calibration Laboratory is formed to achieve the demanding projects from health industry. To quantify and qualify the interest and knowledge of BE students, a total of 40 students were surveyed on a period of 5 days. Promising results were shown regarding on good basic knowledge of metrology concepts and encouraging interest by 60% of students. With these results, we can assure most students are willing to learn about metrology applied in the health industry for their consideration that it would bring a better and accurate performance of medical devices. Results showed a 65% of interest on including courses about metrology in their career curriculum. ETALONS -Calibration Laboratory- has already begun to recruit undergraduate students for the opportunity of internships, as well as participating along with Tecnológico de Monterrey (ITESM) for seminaries, congress conferences, metrology workshops, etc. On the other hand, seeing the promising interest of BE students for metrology, ETALONS has decided to propose a topic course for the BE curriculum on metrology focused on health industry as well as a project for the Innovation Week (Semana i) that ITESM carries out every year internally. According to this activities, students can have the convenience to learn, work and apply their knowledge on a company specialized on metrology and calibration services with a special department focused on BE.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"1 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":"132378917","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.05
J. Fuehne
The Purdue Polytechnic Institute is one of ten colleges on the campus of Purdue University in West Lafayette, Indiana. Also included in the Institute is an outreach effort that includes ten locations spread throughout the state of Indiana to engage local communities and industries and to provide an alternative to the main campus for traditional and non-traditional students in those geographic areas. One of those areas is Columbus, Indiana, about an hour south of Indianapolis, and this paper relates experiences from that location. The Purdue Polytechnic Institute is using modernized teaching methods that are "research-proven, state-of-the-art teaching methods that are different, fun, challenging and more effective." One element of this is to bring these methods to a first-semester class so that the newest students can experience these methods and understand what to expect over their time with the Polytechnic Institute. Purdue Polytechnic Columbus is unique among the outreach locations due to a partnership with diesel-engine manufacturer Cummins Inc. that has led to an environmentally-controlled metrology lab located within the university facility. The lab contains a calibrated coordinate measuring machine, calibrated tensile tester, a surface finish instrument, a roundness tester and a plethora of donated hand tools including calipers, micrometers, height gauges, bore gauges, PI tapes, sine blocks, and several sets of gauge blocks. This new class attempts to integrate nearly all facets of the metrology lab into the learn-by-doing activities to provide a fun, unparalleled experience for the first-time students. Activities described in the paper include micrometer calibration using gauge blocks, a study of springs using a height gauge and mass standards, pressure and force measurements of footballs, load-displacement characteristics of various bandages, and calculation of volume and surface area of various objects using calipers, micrometers, and rulers. In all cases, students are required to summarize data by developing graphs and tables using spreadsheet software.
{"title":"A New, Gateway Class Emphasizing Metrology","authors":"J. Fuehne","doi":"10.51843/wsproceedings.2017.05","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.05","url":null,"abstract":"The Purdue Polytechnic Institute is one of ten colleges on the campus of Purdue University in West Lafayette, Indiana. Also included in the Institute is an outreach effort that includes ten locations spread throughout the state of Indiana to engage local communities and industries and to provide an alternative to the main campus for traditional and non-traditional students in those geographic areas. One of those areas is Columbus, Indiana, about an hour south of Indianapolis, and this paper relates experiences from that location. The Purdue Polytechnic Institute is using modernized teaching methods that are \"research-proven, state-of-the-art teaching methods that are different, fun, challenging and more effective.\" One element of this is to bring these methods to a first-semester class so that the newest students can experience these methods and understand what to expect over their time with the Polytechnic Institute. Purdue Polytechnic Columbus is unique among the outreach locations due to a partnership with diesel-engine manufacturer Cummins Inc. that has led to an environmentally-controlled metrology lab located within the university facility. The lab contains a calibrated coordinate measuring machine, calibrated tensile tester, a surface finish instrument, a roundness tester and a plethora of donated hand tools including calipers, micrometers, height gauges, bore gauges, PI tapes, sine blocks, and several sets of gauge blocks. This new class attempts to integrate nearly all facets of the metrology lab into the learn-by-doing activities to provide a fun, unparalleled experience for the first-time students. Activities described in the paper include micrometer calibration using gauge blocks, a study of springs using a height gauge and mass standards, pressure and force measurements of footballs, load-displacement characteristics of various bandages, and calculation of volume and surface area of various objects using calipers, micrometers, and rulers. In all cases, students are required to summarize data by developing graphs and tables using spreadsheet software.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"106 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":"133433007","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.44
Tyler Roach
Periodic calibration does not prevent out-of-tolerances from occurring, but with a well-managed recall program, the risk can be minimized. Managing calibration recall intervals can be a perplexing task and sometimes seem somewhat arbitrary. Do I use the manufacturer's recommended interval? Do I use the ever so popular, yet arbitrary 12-month interval? Or, do I just use the interval that was used last time my unit was calibrated? Selecting an interval that is too long could save on excessive calibration costs, however it could also introduce the additional unwanted risk of using an out of tolerance item. An interval that is too short would eliminate that risk, but calibration costs will rise. The goal is to have the perfect Goldilocks situation to find an interval that is just right. One that will reduce calibration costs, yet still give you confidence that it will still be in-tolerance at the next calibration event. A simple examination of past calibration history, combined with a few strategic confidence checks will make managing recall intervals logical and cost effective.
{"title":"Logical And Cost Effective Calibration Intervals","authors":"Tyler Roach","doi":"10.51843/wsproceedings.2017.44","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.44","url":null,"abstract":"Periodic calibration does not prevent out-of-tolerances from occurring, but with a well-managed recall program, the risk can be minimized. Managing calibration recall intervals can be a perplexing task and sometimes seem somewhat arbitrary. Do I use the manufacturer's recommended interval? Do I use the ever so popular, yet arbitrary 12-month interval? Or, do I just use the interval that was used last time my unit was calibrated? Selecting an interval that is too long could save on excessive calibration costs, however it could also introduce the additional unwanted risk of using an out of tolerance item. An interval that is too short would eliminate that risk, but calibration costs will rise. The goal is to have the perfect Goldilocks situation to find an interval that is just right. One that will reduce calibration costs, yet still give you confidence that it will still be in-tolerance at the next calibration event. A simple examination of past calibration history, combined with a few strategic confidence checks will make managing recall intervals logical and cost effective.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"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":"129436952","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.39
Hsiu-lin Lin
Under ISO/IEC 17025, the laboratories are generally required to participate in interlaboratory comparisons or proficiency testing to maintain their high competence and assure the quality of results for establishing the effectiveness and comparability of calibrations. Participation in proficiency testing to assure the good performance and capabilities is the basic requirement for laboratories in Taiwan to apply for accreditation certification or seek an extension of the certification issued by Taiwan Accreditation Foundation (TAF), the main accreditation body in Taiwan. When the proficiency testing is not available, the calibration laboratories in Taiwan shall participate in the measurement audits under the requirement of TAF. The Center for Measurement Standards of Industrial Technology Research Institute (CMS/ITRI) not only organize the proficiency testing programs regularly but also provide the measurement audits to meet the needs of the calibration laboratories that apply for the new accreditation items. In the last two years, the tests of energy efficiency of compressed air systems were required by law, digital pressure gauge calibration services are urgently demanded in industry. In order to expand their measurement scopes to include the digital pressure gauge calibration, 11 laboratories applied for measurement audits with the CMS/ITRI since there was no proficiency testing program for digital pressure gauge calibration. In these audits, the National Measurement Laboratory (NML) provided the reference values for the digital pressure gauges. In this paper, the results of interlaboratory comparisons for 11 laboratories were analyzed based on the outcomes of the measurement audits. Through the statistical analysis, the comparison results showed reasonable agreements in general among the measurements on digital pressure gauge calibration for most of calibration laboratories. It can also be found in this analysis that the measurement audits can be used in confirming the competence of the laboratories and provide solid proof for accreditation purpose.
{"title":"Calibration Capability Analysis for Digital Pressure Gauge through Measurement Audits: The Alternative to Proficiency Testing ","authors":"Hsiu-lin Lin","doi":"10.51843/wsproceedings.2017.39","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.39","url":null,"abstract":"Under ISO/IEC 17025, the laboratories are generally required to participate in interlaboratory comparisons or proficiency testing to maintain their high competence and assure the quality of results for establishing the effectiveness and comparability of calibrations. Participation in proficiency testing to assure the good performance and capabilities is the basic requirement for laboratories in Taiwan to apply for accreditation certification or seek an extension of the certification issued by Taiwan Accreditation Foundation (TAF), the main accreditation body in Taiwan. When the proficiency testing is not available, the calibration laboratories in Taiwan shall participate in the measurement audits under the requirement of TAF. The Center for Measurement Standards of Industrial Technology Research Institute (CMS/ITRI) not only organize the proficiency testing programs regularly but also provide the measurement audits to meet the needs of the calibration laboratories that apply for the new accreditation items. In the last two years, the tests of energy efficiency of compressed air systems were required by law, digital pressure gauge calibration services are urgently demanded in industry. In order to expand their measurement scopes to include the digital pressure gauge calibration, 11 laboratories applied for measurement audits with the CMS/ITRI since there was no proficiency testing program for digital pressure gauge calibration. In these audits, the National Measurement Laboratory (NML) provided the reference values for the digital pressure gauges. In this paper, the results of interlaboratory comparisons for 11 laboratories were analyzed based on the outcomes of the measurement audits. Through the statistical analysis, the comparison results showed reasonable agreements in general among the measurements on digital pressure gauge calibration for most of calibration laboratories. It can also be found in this analysis that the measurement audits can be used in confirming the competence of the laboratories and provide solid proof for accreditation purpose.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"48 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":"133951928","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.17
Diaz J. César
The application of metrology in daily activities is undeniable, specifically has become increasingly important on applications in industry, scientific and also in education. Currently in Mexico the Industrial Engineering degree is offered as a new option. Graduates have been widely accepted by industry, calibration laboratories and research laboratories. Universidad Politécnica de Santa Rosa Jáuregui is the first university to offer the major in Metrological Engineering, whose curriculum is specifically focused on careers in scientific, legal or industrial metrology. In our curriculum, we have designed in opportunities to participate in research and development projects. In this paper, we present four such projects. Also offers different research and development projects, the present addresses four projects carried out and the results that have had as input in the training of the student. The inclusion of learning based projects with the focus on student growth has also been considered. The development of didactic prototypes of the seven base units, the proposal for the development of an application of a mobile laboratory with adaptable metrological modules, the development of an integral hydro static weighing system and finally the development of Fixture & Gage devices for the measurement of automotive components as part of the studentsˆ participation in competitions with other universities.
{"title":"The Inclusion of Didactic Metrological Activities in Education","authors":"Diaz J. César","doi":"10.51843/wsproceedings.2017.17","DOIUrl":"https://doi.org/10.51843/wsproceedings.2017.17","url":null,"abstract":"The application of metrology in daily activities is undeniable, specifically has become increasingly important on applications in industry, scientific and also in education. Currently in Mexico the Industrial Engineering degree is offered as a new option. Graduates have been widely accepted by industry, calibration laboratories and research laboratories. Universidad Politécnica de Santa Rosa Jáuregui is the first university to offer the major in Metrological Engineering, whose curriculum is specifically focused on careers in scientific, legal or industrial metrology. In our curriculum, we have designed in opportunities to participate in research and development projects. In this paper, we present four such projects. Also offers different research and development projects, the present addresses four projects carried out and the results that have had as input in the training of the student. The inclusion of learning based projects with the focus on student growth has also been considered. The development of didactic prototypes of the seven base units, the proposal for the development of an application of a mobile laboratory with adaptable metrological modules, the development of an integral hydro static weighing system and finally the development of Fixture & Gage devices for the measurement of automotive components as part of the studentsˆ participation in competitions with other universities.","PeriodicalId":432978,"journal":{"name":"NCSL International Workshop & Symposium Conference Proceedings 2017","volume":"141 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":"115070136","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}
Pub Date : 1900-01-01DOI: 10.51843/wsproceedings.2017.19
Dennis Jackson
The accuracy of a calibration or testing scenario is often measured using the Test Uncertainty Ratio (TUR) which is the ratio of the specification to be tested to the calibration process uncertainty. As a result of improvements in the state of the art in Test, Measurement, and Diagnostic Equipment (TMDE), it is often difficult to meet TUR requirements. When a TUR requirement can't be met, what then? As a result of the transition to the use of the Probability of False Acceptance (PFA) as a primary metric for calibration testing, there are many appropriate strategies for dealing with this situation. A common approach is to simply apply a guard band to the test tolerances. However, it has been found that this is not always appropriate. In fact, there is a fairly narrow set of situations in which guard bands should be employed. This paper discusses alternatives that should be considered in addition to guard bands.
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