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Fundamental Electrical Measurements Group


The Fundamental Electrical Measurements group supports the nation’s infrastructure by providing calibration services in the general areas of resistance and impedance. As part of this mission, the group maintains an active research program in precision measurements based on fundamental constants in the development of quantum electrical standards.

The FEM group uses physical laws, quantum invariants, and ultra-precision measurement techniques to create and refine a core set of experiments used as the US national standards for the ohm, farad, and, in the near future, the kilogram. The group strives to improve the accessibility, reliability, precision, accuracy, and range of values that can be achieved and disseminated from each standard by advancing the state of the art in optical, mechanical, and, of course, electrical systems used in the realization of these units.


Electronic Kilogram—This project provides the basis for a new definition of mass, based on unchanging quantum properties of nature rather than a physical artifact. This is accomplished through a high-accuracy …

Metrology of the Ohm—Resistance standards traceable to NIST provide references for measurements of current at levels from 3000 A to below 20 fA and are used to support a wide variety of impedance, temperature, strain, …

Quantum Conductance—Graphene, discovered in 2004, has truly extraordinary electronic properties that enable new approaches in many areas where conventional materials are running into obstacles, ranging from the macro …

Farad and Impedance Metrology—This project aims to provide the world’s best basis for accurate impedance measurements by tying the U.S. legal system of electrical units to the International System of Units (SI) through the …


Jon Pratt
301-975-5470 Telephone

100 Bureau Drive, M/S 8171
Gaithersburg, MD 20899-8171