Jorge M.E. Saffar, Maria Luísa C. Costa Reis, Eunice M. Ferreira Marques, Daniel S. Alves de Lima
This paper presents the methodology and results of an interlaboratory comparison currently in progress for the validation of forces generated by the 5 kN force standards machine (MCCC) designed and manufactured for the Low Force Laboratory (LBF) of the Aerospace Technical Centre (CTA), Brazil. Reference forces were generated by the 5,2 kN force standards machine of the Isaac Newton Laboratory of the Technological Centre Foundation in the State of Minas Gerais (CETEC). Results obtained in the first phase of the intercomparison have shown that the errors and the best measurement capability are...
XVIII IMEKO World Congress
· TC3
· 2006
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C. Jacques, G.D. Chapman
The mass measurement of the water content of a pycnometer is done in the same way as a mass measurement of a solid artefact. There are many types of pycnometers, among them there are the Gay-Lussac types, and within the latter there are those with an anti-evaporation cap and those without. Pycnometers without a cap let the water evaporate during the measurement process. Yet it is possible to measure the mass of the full pycnometer by extrapolating backward in time from the weighing measurements taken over a period of time. The analysis of the process is presented here as well as the...
XVIII IMEKO World Congress
· TC3
· 2006
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Boris Katz, Liron Anavy, Itamar Nehary
Developed, put into practice and used the universal automatic system MABA-2000 for calibration of force measurement devices in accordance to ISO 376-1999, ISO 7500-1999 and manufacturer requirements. The system includes a set of load cells from 1 kN to 5 MN, amplifier DMP-40 (HBM), computer and accessories. Mathematically proved the possibility of calibration in points, which vary from series to series, proved, and confirmed the application of calculation of formulas accuracy deviation and repeatability in accordance to ISO 7500-1999. This approach increases the productivity and simplifies...
XVIII IMEKO World Congress
· TC3
· 2006
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Jin Wan Chung, Sungjun Lee, Woo Gab Lee
KRISS mass laboratory is studying the adsorption effect of the weight and silicon (Si) surface by using the precise mass comparator which can be used in vacuum and developing the ellipsometric system. For its preliminary study, the mass of Si sphere which is using for the density standard at KRISS density laboratory is measured in air before and after vacuum. Si surface artifacts (SAs) are fabricated and measured dimension and roughness. Preliminary experiments are carried out in vacuum and in air. In this paper, we report on a preliminary study conducted at the KRISS in which we examined...
XVIII IMEKO World Congress
· TC3
· 2006
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Stuart Davidson
The cleaning of primary platinum-iridium mass standards is traditionally achieved using the nettoyage-lavage process developed at the BIPM. This manual cleaning method is notoriously difficult to reproduce, particularly at laboratories other than the BIPM. An alternative, operator independent, method for the cleaning of primary mass standards, using UV activated ozone, has been investigated and the results are reported.
XVIII IMEKO World Congress
· TC3
· 2006
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Michael Kobusch, Thomas Bruns
This paper gives a comprehensive overview about the contributions to the measurement uncertainty of the 20 kN Impact Force Machine at PTB. Various influences resulting from interferometric velocity measurements, data analyses, mass determinations and parasitic forces are described and estimated by theoretical or experimental data if possible.
XVIII IMEKO World Congress
· TC3
· 2006
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Lutz Doering, Erwin Peiner, Michael Balke, Uwe Brand
Traceable measurement of micro forces involved during stylus profiling is described. For this purpose two methods based on a transferable cantilever-type force standard were developed using the cantilever deflection and the output voltage of an integrated piezoresistive strain gauge. Force calibration was performed with commercial stylus instruments in the range of 10 - 200 µN.
XVIII IMEKO World Congress
· TC3
· 2006
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M.M. San Andrés, L.O. Becerra, G. Vallejos, A. Quiroga, R. Chanchay, A. Bermúdez, E. Salazar
The purpose of this report is to show different ways for the analysis of Interlaboratory Comparisons results, evaluated from real results obtained in the Comparison of mass standards within the Program of Cooperation and Technical Attendance UE-CAN in Quality, N^AECR/B7-31/IB/96/0188.
XVIII IMEKO World Congress
· TC3
· 2006
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Luiz Carlos Cabral de Freitas, Stella Regina da Costa, Rafael S. de Oliveira
The purpose of this paper is to show the needs and to propose a new methodology for a better dissemination of torque quantity in Brazil. Starting traceability from the Force, Torque and Hardness Laboratory (LAFOR) in the National Institute of Metrology, Standardization and Industrial Quality (INMETRO), an improvement to the Primary Torque Standard was necessary. In the same way, the acquisition of new transfer and reference standards, together with the development and adoption of new methods for torque calibration systems characterization, are important for a better acting of Inmetro’s...
XVIII IMEKO World Congress
· TC3
· 2006
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Luis O. Becerra, Luz. Ma. Centeno
This paper presents the results obtained from density measurements of pure water produced at CENAM. This water is used as density standard for calibrations services. The measurements were done into a scheme of experimental design in order to find possible sources of variability in the hydrostatic weighing system of the national density standard. The design factors checked were: days after the water is produced, positions of the solid density standards at the hydrostatic weighing system and the spheres used. The variable of interest for the scheme of experimental design was the difference...
XVIII IMEKO World Congress
· TC3
· 2006
· Download