measurement uncertainty – Page 4

Two Simple and Practical Methods for Combining Prior Information with Current Measurement in Uncertainty Analysis

October 23, 2020 Office

by Hening Huang This paper presents two simple and practical frequentist methods for combining prior information with current measurement in uncertainty analysis. The first method is based on the “law of combination of distributions” (LCD). […]

A Unified Formula for Uncertainty Estimation in Interlaboratory Studies and Key Comparisons

January 27, 2020 Office

By Hening Huang A variety of statistical methods are available for estimating consensus values in interlaboratory studies (including key comparisons). These methods, although developed based on different approaches and ranging from simple to complex, produce […]

Pass or Fail: With Which Probability?

October 23, 2019 Office

by Manuel Rodríguez In this paper, the Probability of Pass (PoP) and the Probability of Fail (PoF) are derived following a metrological approach, in which concepts such as repeatability, number of effective degrees of freedom, […]

Probability of False Acceptance Estimation for Asymmetrical Tolerances

July 15, 2019 Office

by Pedro Adame One of the newest, hence less studied standards for calibration is the ANSI/NCSL International Z540.3 standard. The main difference with the more known ISO/IEC 17025 standard is the need to estimate and […]

Freeware

The GUM Tree Calculator (GTC)

December 31, 2018 Office

The GUM Tree Calculator (GTC) is a data processing tool with full support for uncertainty calculations involving real and complex quantities. GTC is a stand-alone executable for Windows. It can handle instructions typedat the command […]

Calculating the Frequency Response of an Oscilloscope from a Transition Duration Measurement

November 5, 2018 Office

by Donald Larson Many digital oscilloscopes have the capability of acquiring, displaying, and storing a digitized representation (the waveform) of an electrical signal. This digitization creates data, the waveform samples, that have discrete amplitude values […]

More on the t-Interval Method and Mean-Unbiased Estimator for Measurement Uncertainty Estimation

June 27, 2018 Office

by Hening Huang This paper further explores the t-interval method and the mean-unbiased estimator for uncertainty estimation with a small number of measurements. It describes the logic behind the error bound-based definition of uncertainty, which […]

What is Measurement Risk?

June 21, 2017 Office

by Henry A. Zumbrun Imagine that a satellite is launched into space and communications are intermittent. This happens because the satellite is wobbling, which causes connection problems in the receiver. The cause of the wobbling […]