February 2013 – Cal Lab Magazine

Verifying 1 mW 50 MHz Power Reference Output SWR

February 19, 2013 Office

by Charles Sperrazza Verification of the Standing Wave Ratio (SWR) of the 50 MHz 1 mW output power reference is a key step in performing a calibration of a RF power meter. Higher than desired […]

Stating Best Uncertainties Over a Range of Values

February 19, 2013 Office

by David Deaver The Guides to Measurement Uncertainty (GUMs) give very prescriptive methods for calculating measurement uncertainty at individual points. Some laboratories undertake the calculation of uncertainty at many points and state them in their […]

An Uncertainty Analysis for a Positive Displacement Liquid Flow Calibrator Using the Water Draw Technique

February 19, 2013 Office

by Wesley B. England This paper is an uncertainty analysis performed by the Liquid Flow Lab of the Army Primary Standards Laboratory (APSL) for the calibration of positive displacement piston prover using a volumetric water […]