Some Issues in Magnetic Measurement of Mass Standards

Abstract

Magnetic interactions may lead to errors in precision mass metrology. There are two factors named magnetic susceptibility and magnetic polarization which need to be determined before mass metrology. First four methods are compared and analyzed suitable range, requirement, uncertainty and note in comparison process. Then uncertainty factors are given out, and description of differences between normal weights and micro-gram standards are presented in the paper. It is easy to become magnetized if the weight is not well protected in manufacture or daily using. So it is important to control its safe and perform periodic self-verification on it.

Dissemination of Micro-Gram Weights from 500 μg to 50μg Based on Automatic Mass Measuring System

“…The growing and evolving dynamics in mass and force measurements has inevitably necessitated the need for high precision and accurate results. As a result, measurements in micro-gram(s) and nano-Newtons levels have increasingly attracted potential research interests [1]. However, at the moment, such results have no measurement assurance since traceability to the International System of Units (SI) has not yet been developed [2].…”

Calibration of Weights and Weight Sets Based on Micro-Mass Standard Measurement System

“…Measurements of small forces (micro and nano-Newton levels) are increasingly being embraced in various disciplines [1], such as nano/bio-mechanical testing and medicine [2] [3]. In realizing these small forces, most National Metrology Institutes (NMIs) use mass artifacts (of 0.5 mg) to generate a force of 5×10 -6 N [4] [5] [6].…”