Articles Published in Cal Lab Magazine
by Richard Hogan Resolution uncertainty is the uncertainty in measurement contributed by resolution of measurement equipment. Resolution Uncertainty is a factor that contributes to uncertainty in measurement. Its influence should be considered in every uncertainty […]
by H. Zumbrun and A. Zeinali There are several labs operating throughout the world, whom do not follow a designated guideline for calculating measurement uncertainty for force calibrations. Realizing the need for a guidance document, […]
by Roland A. Boucher When the French proposed their first metric system in 1723, they had no idea it had been invented by the ancient Mesopotamians 5000 years earlier. Just as the French proposed to […]
by Hening Huang The Welch-Satterthwaite (WS) formula estimates an “effective degrees of freedom” of an approximate Chi-square distribution formed from a combination of several sample variances of independent normal populations. The effective degrees of freedom […]
By Richard Fertell, Hamed Ershad, York Xu, Osborne Gumbs, Tammy Tran This article is the first of a series describing how to perform liquid flow rate calibrations at fluid temperatures below +5 °C and above […]
by Christopher L. Grachanen On July 22, 2016, the US Bureau of Labor Statistics (BLS) published their second federal register denoting proposed changes and additions for the upcoming 2018 Standard Occupational Classification (SOC) system. The […]
by Dr. George Anastasopoulos As we discussed in my previous relative article “The new ISO/IEC 17025 – What to expect”, ISO/IEC 17025 was first issued in 1999 by the International Organization for Standardization (ISO) and […]
by Ted Doiron While check standards will eventually give the most accurate uncertainty for a calibration procedure, the time and expense can be discouraging. Another common method, standard Gage Repeatability and Reproducibility study does not […]
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