(Calib.) Artículos
URI permanente para esta colecciónhttps://inta.metricsalad.com/handle/123456789/65
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Examinando (Calib.) Artículos por Materia "Calibration"
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Publicación Restringido Practical Calibration of Platinum Resistance Thermometers in the Range −190 °C to 0 °C(Springer Link, 2011-10-22) De Lucas Veguillas, Javier; Benyon Puig, RobertThe results obtained in the characterization of a low-temperature comparator and its performance in relation to the calibration of metal and borosilicate sheathed standard platinum resistance thermometers (SPRTs) calibrated at the International Temperature Scale of 1990 (ITS-90) fixed points, are presented and discussed. The principal influence quantities are addressed and the estimation of measurement uncertainty supporting the calibration and measurement capability (CMC) accredited by Entidad Nacional de Acreditación (ENAC), the Spanish Accreditation Body, are presented and discussed.Publicación Restringido The Calibration of Data Loggers for the Characterization of Sterilization Autoclaves(Springer Link, 2011-10-16) De Lucas Veguillas, Javier; Elvira, Gregorio; Fuentes, H.; Benyon Puig, RobertAn experimental setup established for the calibration of temperature and pressure data loggers for use in the characterization of autoclaves and steam sterilizers is described. The results obtained on two devices in the range of 25 °C to 125 °C at absolute pressures from 100 kPa to 375 kPa are presented and discussed in the context of the manufacturer’s specifications and their suitability for on-site characterization of the temperature and pressure conditions during the normal operational cycles. The recommendations on the calibration of these devices and the estimation of the contributions to the expanded uncertainty of measurement for the characterization of autoclaves are addressed.Publicación Acceso Abierto Uncertainty in the Calibration Transfer of Solar Irradiance Scale: From Absolute Cavity Radiometers to Standard Pyrheliometers(Multidisciplinary Digital Publishing Institute (MDPI), 2022-04-02) Balenzategui, José Lorenzo; Molero, María; Silva, José Pedro; Fabero, Fernando; Cuenca, José; Mejuto, Eduardo; De Lucas Veguillas, JavierIn this work, the method for calculation of uncertainty of pyrheliometers’ responsivity during their outdoor calibration process in the laboratory is exposed. It is applied first for calibration of standard pyrheliometers by comparison to cavity radiometers, and after for calibration of an end-user pyrheliometer against that standard pyrheliometer. The dissemination of the WRR irradiance scale is illustrated in practice and the increasing uncertainty in the traceability chain is quantified. The way of getting traceability to both WRR scale and to SI units in the current situation, where the shift between these radiometric scales is pending to be solved, is also explained. However, the impact of this gap between scales seems to be more important for calibrations of reference Class A pyrheliometers than in the final determination of DNI irradiance, because in this case, the cumulative uncertainty is large enough as to not significantly be affected for the difference. The way to take into account different correction terms in the measurement model function, and how to compute the corresponding uncertainty, is explained too. The influence of temperature of some pyrheliometers during calibration process and the potential impact on the DNI irradiance calculated with these instruments is exemplified.
