Articles – Page 20 – Cal Lab Magazine

A Comparison of Deadweight Testers and Digital Pressure Calibrators

June 27, 2018 Office

by Sean Nielson When choosing which instrument to use when calibrating pressure, the two most popular choices are deadweight testers and digital pressure gauges/calibrators with a pressure comparator. Each has its advantages and disadvantages. The […]

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 […]

A Risk Based Approach to Calibration Laboratory Infrastructure Modernization

June 27, 2018 Office

by Kevin R. Abercrombie Laboratories are often faced with budget constraints that limit the amount measurement system infrastructure upgrades that can be accomplished in any fiscal year. This paper describes a risk based approach to […]

Calibrating a Micropipette

April 3, 2018 Office

by Martin de Groot This paper discusses the calibration of pipette, with particular attention to the type that is used and calibrated most frequently. This is the so-called air-displacement pipette, single channel, adjustable volume pipet. […]

An Introduction to the Differences Between the Two Most Recognized Force Standards

April 3, 2018 Office

by Henry Zumbrun Morehouse has been performing both ASTM E74 and ISO 376 calibrations for more than fifteen years. We have been calibrating in accordance with the ASTM E74 standard since its introduction in 1974, […]

Creating a Taxonomy for Metrology

April 3, 2018 Office

by Michael Schwartz This paper covers the progress of the MII (Measurement Information Infrastructure) effort to create a standard for expressing a calibration laboratory capabilities, ISO/IEC 17025 Scope of Accreditation (SoA) in a XML formatted […]

Basic Rise Time Measurements

December 14, 2017 Office

by Jerry Eldred Although rise time is a common calibration measurement in pulse/function generators and some oscilloscopes, it is often not well understood. Making a good rise time measurement is somewhat similar to home stereo […]

Large Volume Cone Differential Pressure Meters

December 14, 2017 Office

by Richard Steven & Joshua Kinney Cone DP meters are a member of the generic DP flow meter family. Used extensively throughout different industries for quarter of a century, the cone meter is now a […]