Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Stephan Schlamminger (Fed)


Stephan Schlamminger received a diploma in physics from the University of Regensburg, Germany, in 1998 and a Ph.D. degree in experimental physics from the University of Zurich, Switzerland, in 2002. The topic of his thesis work was the determination of the gravitational constant. From 2002 to 2010, he worked at the University of Washington on an experimental test of the equivalence principle. In 2010, he came to the National Institute of Standards and Technology to work on the watt balance (now Kibble balance). He became the group leader of the fundamental electrical measurement group in 2016. From 2017 to 2018, he taught physics at the Regensburg University of Applied Science. Since the Fall of 2018, he has been working as a physicist in the Fundamental Electrical measurement group within the Physical Measurement Laboratory at the National Institute of Standards and Technology on topics related to the realization of the unit of mass and impedance measurements.

His research interests include precision mechanical and electromechanical measurements, signal conditioning, and data analysis. He contributed to the 2019 revision of the International System of Units (SI) and is interested in precisely determining the gravitational constant.


Measuring the frequency of a pendulum

Jon R. Pratt, Stephan Schlamminger, Charles Condos, Jack Manley, Dalziel Wilson
We previously reported the use of a chip-scale torsion pendulum as a clock gravimeter, exploiting the parametric coupling of its frequency to the local

New Method for Determining Time Constant of Resistors

Yicheng Wang, Dean G. Jarrett, Andrew D. Koffman, Stephan Schlamminger
We report a new method for determining the time constant of ac resistors with values around 10 kΩ, using a digital impedance bridge for comparison of two

A Macroscopic Mass From Quantum Behavior In An Integrated Approach

Frank Seifert, Alireza Panna, Lorenz Keck, Leon Chao, Shamith Payagala, Dean G. Jarrett, Dipanjan Saha, Randolph Elmquist, Stephan Schlamminger, Albert Rigosi, David B. Newell, Darine El Haddad
The revision of the International System of Units (SI) on May 20th, 2019, has enabled new improved experiments to consolidate and simplify electrical and

Patents (2018-Present)

Created June 4, 2019, Updated December 8, 2022