A. Bounouh, F. Lapostolle, S. Lamy
This paper describes the fabrication and charakterization of ultra thin films of NiCr deposited on cylindrical ac-dc resistance standards. The layers are obtained by magnetron sputtering technique and their structural charakterization are carried out by using Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Atomic Force Microscopy (AFM). A first set of resistance sticks has been obtained with a good homogeneity of thickness. The layer thickness varies from 8 nm to 70 nm and correspond to a wide range of resistance values, from 1 kΩ to 100 kΩ.
XVIII IMEKO World Congress
· TC4
· 2006
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Luca Callegaro, Vincenzo D’Elia
The need for accurate calibration of current meters in the picoampere range is continuously increasing. A traceable current source for calibration of meters in the 100 fA – 100 pA current range is here presented. The source is based on a low-frequency generator ramp generator, which charges and discharges a gas-dielectric capacitor. Current traceability is given by the measurement of voltage parameters with a sampling voltmeter, and by calibration of the capacitor at audio frequency. The source has been employed in the EUROMET.EM-S24 "Comparison of small current sources" supplementary...
XVIII IMEKO World Congress
· TC4
· 2006
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Luca Callegaro, Gian Carlo Bosco, Franco Cabiati, Vincenzo D’Elia
The realization of inductance unit and scale at the Istituto Elettrotecnico Nazionale Galileo Ferraris (IEN), the Italian national metrology institution, has evolved during the last 35 years. An historical survey of realization and dissemination methods, and a graphical analysis of the stability of the mantained national inductance standard, is here reported. Results confirm the high stability of artifact standards.
XVIII IMEKO World Congress
· TC4
· 2006
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Xumo Li
Specially designed bridges are used for standard platinum resistance thermometer (SPRT) calibration to achieve lowest uncertainty. Such bridges are expensive and their measuring speeds are slow. A new type of instrument reported a few years ago was compared against the bridge to see if it is possible to use the new instrument instead of the bridge for SPRT calibration in some cases. Four SPRTs were calibrated at the triple point of water and the freezing points of tin and zinc using a Model 6010T Bridge and the new instrument (Model 1590) simultaneously. At these calibration points the...
XVIII IMEKO World Congress
· TC4
· 2006
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Woo Gab Lee, Jin Wan Chung
Mass comparators have been available for weighing a magazine of weights automatically. The comparators however allow loading of only 3 weights at a time. Therefore new calibration designs for those cases are to be sought, having least amount of uncertainty. Least squares methods with restrictions are used in finding mass calibration designs. Elementary weighings are formed and efficient designs are searched. The comparison is to be made between the searched ones and calibration designs supplied from the manufacturer.
XVIII IMEKO World Congress
· TC3
· 2006
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Luciano Bruno Faruolo, José Luiz Fernandes, Marina Brochado
The present paper shows the advantages and disadvantages of road vehicles weighing. By considering the use of Weigh-in-Motion (WIM) instruments and applying the Monte Carlo`s simulation method, it is possible to demonstrate some factors that actually interfere in the measurement process of road vehicles weighing. This process is one contribution to metrology for the sustainable development, as long as it collaborates for the maintenance, life time and security of the highways.
XVIII IMEKO World Congress
· TC3
· 2006
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Takanori Yamazaki, Satoki Yokoyama, Satoshi Kaneko, Ryuta Sato
This paper provides more details of dynamic behaviors of the feed drive system which consists of an AC servo motor and rolling elements etc. In the feed drive system, the nonlinear behaviors of the internal structure of the rolling element have an crucial influences on precise control performance. Our special interest is how to verify the fundamental data of dynamic behaviors of the feed drive system in the vicinity of a microscopic displacement. Experimental data show that the driving torque curve becomes distorted as the input amplitude of sinusoidal wave to the system gets larger, but the...
XVIII IMEKO World Congress
· TC3
· 2006
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Aimo Pusa, Michael Sachs
The article gives an overview about the present state of torque calibration facilities in the MIKES-RAUTE Mass and Force Laboratory in Lahti, Finland. The laboratory utilises four high-level torque calibration devices in a range from 0,1 N·m to 20 kN·m. Also in use are several facilities for the calibration and testing of torque wrenches and other torque devices. The main components of the calibration devices are described briefly. Beside that the main steps of the development history of the devices during the past 10 years – as a reaction to the needs of the customers – are presented.
XVIII IMEKO World Congress
· TC3
· 2006
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Jorge C. Torres-Guzmán, Claudia Santo, Daniel A. Ramírez-Ahedo, Juan Ch. Villarroel-Poblete
This force comparison was performed among IDIC (Chile), LATU (Uruguay) and CENAM (Mexico), national laboratories within the Interamerican Metrology System (SIM) region. Each laboratory used its national standard for the established measuring range. The comparison started in August 2002 and finished in September 2004. This comparison is the second part of a SIM primary standards comparison carried out with the participation of INMETRO (Brazil), INTI (Argentina) and SIC (Colombia), having CENAM as pilot laboratory, (SIM comparison number SIM 7.7). This comparison has an overlap with the force...
XVIII IMEKO World Congress
· TC3
· 2006
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Jorge Antônio da Paz Cruz, Luis Carlos Cabral de Freitas, Cláudio Afonso Koch, Ademir Chagas, Adriana da Cunha Rocha
The main purpose of this work is to present the modifications and improvements performed on the 10kN deadweight machine installed at the Force, Torque and Hardness Laboratory of the National Institute of Metrology, Standardization and Industrial Quality – INMETRO. This work is also an extension of a previous IMEKO paper where this same machine has been characterized. A series of modifications were implemented in the machine along the years. These modifications consisted mainly of switching the loading frame from two columns one to a set of three columns. Also, the installation of a mass...
XVIII IMEKO World Congress
· TC3
· 2006
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