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Displaying 201 - 225 of 275

Tech Note 1458|NIST Measurement Service for DC Standard Resistors

March 8, 2004
Author(s)
Randolph Elmquist, Dean G. Jarrett, George R. Jones Jr., Marlin E. Kraft, Scott H. Shields, Ronald F. Dziuba
At the National Institute of Standards and Technology (NIST), the U.S. representation of the ohm is based on the quantum Hall effect, and it is maintained and disseminated at various resistance levels by working reference groups of standards. This document

A Bridge for Scaling to Higher Resistance from the QHR

August 21, 2003
Author(s)
Randolph Elmquist, Dean G. Jarrett
A two-terminal bridge for resistance scaling directly from the quantum Hall resistance (QHR) to higher-resistance values now provides a secondary starting point in decade scaling at NIST, beginning at the 1 M(Ohm) resistance level. This cryogenic bridge

Changes and Improvements in the 10 k-ohm Special Calibration Service

August 21, 2003
Author(s)
George R. Jones Jr., Marlin E. Kraft, Randolph Elmquist
The 1(ohm) level of resistance has been the source of the lowest standard uncertainties for d.c. resistance calibrations. At the 10 k(ohm) level, equally good transport standards are available and many laboratories also rely on these standards. NIST uses

Using a High-Value Resistor in Single-Electron Counting Measurements

June 1, 2002
Author(s)
Randolph Elmquist, Neil M. Zimmerman, William Huber
An experiment using a high-value cryogenic resistor is proposed, with the aim of improving the experimental link between three quantum electrical standards. This technique is new in its approach and does not require feedback from either a voltage detector

Using a High-Value Resistor in Triangle Comparisons of Electrical Standards

June 1, 2002
Author(s)
Randolph Elmquist, Neil M. Zimmerman, William Huber
We propose an experiment with some advantages over other direct quantum metrology triangle comparisons. First, by using a cryogenic resistor that can be calibrated, the QHR standard needs to be used only for short periods. Second, the experiment does not

The Ampere and Electrical Standards

January 1, 2001
Author(s)
Randolph Elmquist, Marvin E. Cage, Yi-hua D. Tang, Anne-Marie Jeffery, Joseph R. Kinard Jr., Ronald F. Dziuba, Nile M. Oldham, Edwin R. Williams
This paper describes some of the major contributions to metrology and physics made by the NIST Electricity Division, which has existed since 1901. It was one of the six original divisions of the National Bureau of Standards. The Electricity Division

What Metrology Gains With Quantized Resistance Standards

December 1, 2000
Author(s)
Randolph E. Elmquist
The emergence of quantum metrology is expressed in modern electrical standards, primarily through the Josephson effect and the quantum Hall effect. The Josephson and von Klitzing constants that relate to these standards are given in quantum theory by ideal

Comparison of Quantum Hall Effect Resistance Standards of the NIST and the BIPM

January 1, 2000
Author(s)
F. Delahay, Thomas J. Witt, Randolph Elmquist, Ronald F. Dziuba
An on-site comparison of the quantum Hall effect (QHE) resistance standards of the National Institute of Standards and Technology (NIST) and of the Bureau International des Poids et Mesures (BIPM) was made in April 1999. Measurements of a 100 ω standard in

Calculable Coaxial Resistors for Precision Measurements

May 1, 1999
Author(s)
Randolph E. Elmquist
Coaxial straight-wire resistors have been constructed with the purpose of improving comparisons between resistors, capacitors, and inductors in the audio frequency range. The design is based on the principle that a coaxial line with a cylindrical shield