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Displaying 2351 - 2375 of 5221

A Digital-to-Analog Converter with a Voltage Standard Reference

July 1, 2012
Author(s)
Alain Rufenacht, Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
Commercially available 20-bit digital to analog converters (DACs) have the potential to impact the field of low frequency voltage metrology. We measured a linearity of ±6 µV (±0.6 µV/V full scale) over the 10 V range for such a DAC with a Zener voltage

A Direct Comparison System for Power Calibration up to 67 GHz*

July 1, 2012
Author(s)
Thomas M. Wallis, Thomas P. Crowley, Denis X. LeGolvan, Ronald A. Ginley
A direct comparison system for calibration of power sensors with 1.85 mm precision coaxial connectors up to 67 GHz has been developed. The comparison is implemented in two frequency bands. Between 10 MHz and 50 GHz, power sensors with 2.4 mm coaxial

Calibration Techniques for Scanning Microwave Microscopy

July 1, 2012
Author(s)
Thomas M. Wallis, Atif A. Imtiaz, Alexandra Curtin, Pavel Kabos, H. P. Huber, Joseph J. Kopanski, F. Kienberger
Two techniques are described for calibrating a scanning microwave microscope (SMM). The first technique enables spatially-resolved absolute capacitance measurements on the attofarad-to-femtofarad scale. The second technique enables profiling or dopant

Flat frequency response in the electronic measurement of the Boltzmann constant

July 1, 2012
Author(s)
Jifeng Qu, Samuel Benz, Yang Fu, Jianqiang Zhang, Horst Rogalla, Alessio Pollarolo
A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with integration period of

Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards

July 1, 2012
Author(s)
Charles J. Burroughs, Alain Rufenacht, Samuel P. Benz, Paul D. Dresselhaus
The amplitudes of stepwise-approximated sine waves produced by programmable Josephson voltage standards (PJVSs) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a method

Standardizing Rectangular Metallic Waveguides for Terahertz Applications

July 1, 2012
Author(s)
Ronald A. Ginley, N M. Ridler
This paper describes an on-going activity to develop an international document standard for defining rectangular metallic waveguides for use in the submillimeter-wave/terahertz frequency range. The IEEE's Microwave Theory & Techniques Society (MTT-S) is

Testing Phasor Measurement Units using the IEEE 1588 Precision Time Protocol

July 1, 2012
Author(s)
Julien M. Amelot, Gerard N. Stenbakken
As the electric power grid is changing to a smarter more dynamically controlled system, there is increasing need for measurements that show the global status of the system for wide-area monitoring and control. These measurements require time
Displaying 2351 - 2375 of 5221
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