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Standards

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Displaying 626 - 650 of 830

Present Estimates of the Differences Between Thermodynamic Temperatures and the ITS-90

January 29, 2011
Author(s)
Joachim Fischer, M. DePodesta, K. D. Hill, Michael R. Moldover, Laurent Pitre, R. Rusby, Peter Steur, Osamu Tamura, R. White, L. Wolber
In 2005, the Consultative Committee for Thermometry (CCT) recommended the creation of a Mise en pratique for the definition of the kelvin and envisioned that future versions of the Mise en pratique would recommend values of the differences between

Neutron Activation Analysis: A Primary Method of Measurement

January 27, 2011
Author(s)
Robert R. Greenberg, Bode Peter, Fernandes Elisabete
Neutron activation analysis (NAA), based on the comparator method, has the potentials fulfilling the requirements of a primary ratio method as defined in 1998 by the CCQM of the BIPM. This thesis is evidenced in this paper in three Chapters by

GEOMETRICAL MEASUREMENTS OF NIST SRM ROCKWELL HARDNESS DIAMOND INDENTERS

November 21, 2010
Author(s)
Jun-Feng Song, Samuel R. Low III, Xiaoyu A. Zheng
The geometric parameters of 28 candidate Standard Reference Material (SRM) Rockwell hardness diamond indenters are calibrated by an automated system recently developed at the National Institute of Standards and Technology (NIST). The calibration results

Optical fiber power meter comparison between NIST and NIM

November 1, 2010
Author(s)
Igor Vayshenker, Jian Li, L. M. Xiong, Z. X. Zhang, David J. Livigni, Xiaoyu X. Li, John H. Lehman
We describe the results of a comparison of reference standards between the National Institute of Standards and Technology (NIST-USA) and National Institute of Metrology (NIM-China). We report optical fiber-based power measurements at nominal wavelengths of

Maintainers Manual for Version 2.2.1 of the NIST DMIS Test Suite

October 25, 2010
Author(s)
Thomas R. Kramer, John A. Horst
This manual is a maintainers manual for the NIST DMIS Test Suite, version 2.2.1. DMIS (Dimensional Measuring Interface Standard) is a language for writing programs for coordinate measuring machines and other dimensional measurement equipment. The manual is

Users Manual for Version 2.2.1 of the NIST DMIS Test Suite

October 25, 2010
Author(s)
Thomas R. Kramer, John A. Horst
This manual is a users manual for the NIST DMIS Test Suite, version 2.2.1. DMIS (Dimensional Measuring Interface Standard) is a language for writing programs for coordinate measuring machines and other dimensional measurement equipment. The manual

Security Assurance Levels: A Vector Approach to Describing Security Requirements

October 20, 2010
Author(s)
James D. Gilsinn, Ragnar Schierholz
Safety systems have used the concept of safety integrity levels (SILs) for almost two decades. This allows the safety of a component or system to be represented by a single number that defines a protection factor required to ensure the health and safety of

The Roles of the Mise en Pratique for the Definition of the Kelvin

October 16, 2010
Author(s)
Dean C. Ripple, Richard Davis, Bernd Fellmuth, Joachim Fischer, Graham Machin, Terry Quinn, Peter Steur, Osamu Tamura, David R. White
The mise en pratique (“practical realization”) for the definition of the kelvin (MeP-K) was created by the Consultative Committee for Thermometry (CCT) in 2006 to give practitioners of thermometry a guide to the realization of the kelvin, in accord with

Accurate Measurements of Process Gas Flow with Laminar Flow Meters

October 15, 2010
Author(s)
Thiago Cobu, Robert F. Berg, John D. Wright, Michael R. Moldover
We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) with nitrogen at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) over a 10:1 flow range using NIST’s primary flow standards and a physical model. Without additional

Bilateral Comparison Confirms NIMs and NISTs Gas Flow Capabilities

October 15, 2010
Author(s)
Aaron N. Johnson, CHUNHUI LI
The bilateral comparison between NIM and NIST for gas flow was conducted from June 2008 to October 2009. Two critical flow venturis (CFVs) with nominal throat diameters of 10 mm and 20 mm, respectively, were selected as transfer standards. The CFVs were

Properties for Accurate Gas Flow Measurements

October 15, 2010
Author(s)
John D. Wright
Accurate gas properties are needed to take full advantage of the low uncertainties provided by NIST’s Gas Flow Calibration Services. If a flowmeter user and NIST use different values for these properties (molecular mass, compressibility, density, viscosity
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