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- Darine Haddad, Frank Seifert, +5 authors Stephan Schlamminger
- The Review of scientific instruments
- 2016

A precise instrument, called a watt balance, compares mechanical power measured in terms of the meter, the second, and the kilogram to electrical power measured in terms of the volt and the ohm. Aâ€¦ (More)

- Frank Seifert, Alireza Panna, +7 authors Stephan Schlamminger
- IEEE Transactions on Instrumentation andâ€¦
- 2014

The magnet system is one of the key elements of a watt balance. For the new watt balance currently under construction at the National Institute of Standards and Technology, a permanent magnet systemâ€¦ (More)

- Stephan Schlamminger, Darine Haddad, +5 authors Jon R. Pratt
- 29th Conference on Precision Electromagneticâ€¦
- 2014

In 2013, a new measurement of the Planck constant h was performed using a watt balance at the National Institute of Standards and Technology (NIST). The value is h = 6.626 069 79(30) Ã—â€¦ (More)

- Darine Haddad, B. C. Waltrip, R. L. Steiner
- 2012 Conference on Precision electromagneticâ€¦
- 2012

We give a brief description of a low noise, high resolution programmable current source that was designed for the NIST-3 watt balance to determine the Planck constant h and will be used for theâ€¦ (More)

- Darine Haddad, Frank Seifert, +5 authors Stephan Schlamminger
- IEEE Transactions on Instrumentation andâ€¦
- 2015

In early 2014, construction of a new watt balance, named NIST-4, had started at the National Institute of Standards and Technology (NIST). In a watt balance, the gravitational force of an unknownâ€¦ (More)

- Eric J. Leaman, Darine Haddad, +5 authors David B. Newell
- IEEE Transactions on Instrumentation andâ€¦
- 2015

A new watt balance is being constructed at the National Institute of Standards and Technology in preparation for the redefinition of the International System of Units and the realization of massâ€¦ (More)

- Darine Haddad, Leon S. Chao, Frank Seifert, D. B. Newell, Jon R. Pratt, Stephan Schlamminger
- 29th Conference on Precision Electromagneticâ€¦
- 2014

A redefinition of the International System of Units, the SI, is impending and could occur as early as 2017. After redefinition, a means to realize the unit of mass is required. A watt balance is aâ€¦ (More)

- Edwin R. Williams, Darine Haddad, +5 authors Ruimin Liu
- IEEE Transactions on Instrumentation andâ€¦
- 2009

This paper describes a new method to damp out balance pan oscillations, even when the balance is operated in a vacuum. The key is to tune the wavelength of the damping liquid by adjusting the depth.â€¦ (More)

- Dean G. Jarrett, Rand Elmquist, +5 authors Stephan Schlamminger
- 2016 Conference on Precision Electromagneticâ€¦
- 2016

Scaling from the quantum Hall resistance to 100 Î© standard resistors used by the NIST-4 watt balance involves multiple resistance standards and bridges to provide the lowest possible uncertainty.â€¦ (More)

- Darine Haddad, Richard Steiner, Elissa H. Williams, R. Liu
- CPEM 2010
- 2010

The paper describes a technique to simultaneously measure the tilt angles of the induction coil used in the watt balance experiment and correct its position from the Abbe offset error. The same threeâ€¦ (More)