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Standards

Calibration services

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Displaying 276 - 300 of 332

Natural Gas Flow Calibration Service

August 1, 2008
Author(s)
Aaron N. Johnson
This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine turbine meter

A Regional Comparison of Calibration Results for Type K Thermocouple Wire From 100 C to 1100 C

June 5, 2008
Author(s)
K Garrity, Dean C. Ripple, M Araya, C R. Cabrera, L Cordova Murillo, M E. de Vanegas, D J. Gee, Edwin Guillen, S Martinez-Martinez, Edgar Mendez-Lango, L Mussio, S G. Petkovic, K N. Quelhas, G Rangugni, O Robatto, E Von Borrries Rocha
Under the auspices of the Inter-american Metrology System (SIM), the National Institute of Standards and Technology (NIST) initiated a regional comparison for type K thermocouples from 100 deg. C to 1100 deg. C, with 11 participating countries. Each

Prototype Cantilevers for AFM Lateral Force Measurement

June 2, 2008
Author(s)
Richard S. Gates, Mark Reitsma
One of the major difficulties in calibrating the lateral forces measured with optical lever Atomic Force Microscopy is in determining the lateral optical lever sensitivity. Novel cantilevers have been designed and fabricated to simplify this measurement

Automated Continuous-Flow Gravimetric Hygrometer as a Primary Humidity Standard

May 1, 2008
Author(s)
Christopher W. Meyer, Joseph T. Hodges, R W. Hyland, Gregory E. Scace, J Valencia-Rodriguez, James R. Whetstone
A new primary gravimetric hygrometer has been completed at the National Institute of Standards and Technology (NIST). This apparatus determines the humidity in a steadily flowing gas stream by first separating the water from the carrier gas using

Capacitors and Electromagnetic Resonators for Gas Metrology

May 1, 2007
Author(s)
Michael R. Moldover, James W. Schmidt
Gas-filled capacitors are being used as primary thermometers and they show promise as primary pressure standards and for measuring the Boltzmann constant. With these metrological applications in mind, we discuss the advantages and disadvantages of audio

Prototype Cantilevers for SI Traceable NanoNewton Force Calibration

September 20, 2006
Author(s)
Richard S. Gates, Jon R. Pratt
A series of extremely uniform prototype reference cantilevers has been created that can be used to calibrate the spring constants of atomic force microscope (AFM) cantilevers and other micromechanical structures. By utilizing optimal combinations of

Determination of SPRT Realization Uncertainties Between Points

September 6, 2006
Author(s)
Christopher W. Meyer, Dean C. Ripple
Calibrated Standard Platinum Resistance Thermometers (SPRTs) are used to realize the International Temperature Scale of 1990 (ITS-90) from 13.8033 K to 1234.93 K. The SPRTs are calibrated at a series of fixed points, each assigned a temperature on the ITS

NIST Calibration Services for Water Flowmeters Water Flow Calibration Facility

August 1, 2006
Author(s)
Iosif I. Shinder, Iryna V. Marfenko
This document describes the Water Flow Calibration Facility (WFCF) at the National Institute of Standards and Technology (NIST). This facility has three parallel pipelines with diameters of 100, 200 and 400 mm and three weighing systems with capacities of

The Calibration of Vacuum Gauges

March 1, 2006
Author(s)
Patrick J. Abbott
Vacuum gauges are used to measure pressures below the local atmospheric pressure. The success of many processes relies on an accurate vacuum pressure measurement, making calibration of vacuum gauges essential. This paper discusses the issues related to
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