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Proceedings of the 17 th International Conference on Force, Mass, Torque and Pressure Measurements, IMEKO TC3, 17-21 Sept. 2001, Istanbul, Turkey 36 Research, Development and Characterization of a Build-up System Prototype up to 600 kN J.Cruz,* V.Prodonoff**, J.Guerhard*** * National Institute of Metrology, Standardization and Industrial Quality (INMETRO) Xerém, Duque de Caxias, RJ, Brazil **Federal Centre of Technological Education Celso Suckow da Fonseca (CEFET/RJ) Rio de Janeiro, RJ, Brazil ***NUCLEBRAS - Weighed Equipments S.A. (NUCLEP) Itaguaí, RJ, Brazil Abstract This paper describes the research, development, construction, validation tests and metrological characterization of a Force Transducers Pyramid prototype (Build-Up System), in the nominal range of 600 kN. This system is used for the standardization and dissemination of the physical magnitude force, propitiating the utilization of alternative system for calibration of force measurement instruments, such as: force transducers, load cells, proving rings and scales of testing machines. In its construction three force transducers, in the nominal range of 200 kN were used, individually calibrated and later together. In its characterization, a force standardization machine in the nominal range of 1000 kN and a hydraulic force generating machine of 1000 kN were used, both installed in the Force and Hardness Laboratory (LAFOR), of the National Institute of Metrology, Standardization and Industrial Quality (INMETRO). By this way it is intended to transfer and to implant this technology widely spread abroad, to the Brazilian metrological force measurement field. 1. Introduction Since the sixties [1,2], in the metrological standardization institutes and in the industrial field, testing machines and machines of force generation that exceed the available measurement range of force transducers, has been needing to be measured and calibrated. In the more developed countries these forces are measured usually by the force transducers method named Build-up Method or Force Transducers Pyramid, in which groups of three or multiple of three transducers are disposed in parallel [3]. This method is quite efficient and