by Henry Zumbrun What can happen when we use an accuracy specification and assume all the measurements are centered in relation to the specification limits? It is a typical problem in the metrology community, where […]
by Christopher Grachanen Once in a while, during your normal workday, you stumble across a best practice that a client, vendor, supplier or competition has incorporated which really stands out as a superior practice worthy […]
I began my career in Quality Assurance in the Metrology Industry working for a leader in the Global Metrology marketplace. I also worked for a brief stint in the Aerospace manufacturing sector. In my Metrology […]
by Hening Huang This paper is the second one (Part II) in a series of two papers (Part I and Part II) designated to provide practitioner’s perspective on the GUM revision. Part I has discussed […]
by Hening Huang As a practitioner in the field of measurement science, the author strongly concurs in the need for revision of the GUM (Guide to the Expression of Uncertainty in Measurement), as it has […]
A much enlarged second edition of Measurement Uncertainty: A Reintroduction, by Antonio Possolo (NIST) and Juris Meija (NRC Canada) was released April 6, 2022. An inter-American collaboration, the publisher is Sistema Interamericano de Metrologia (SIM) […]
The PSL Uncertainty Calculator is developed by the Primary Standards Lab at Sandia National Laboratories to calculate the combined uncertainty of a system of multiple input parameters. In general, a measurement value is calculated from […]
by Hening Huang This technical note reports a case study that addresses a challenge of interlaboratory consensus building called for by Possolo (2020). The consensus value is estimated as a weighted-average (WA) and the associated […]
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