Consistency of the National Realization of Dew-Point Temperature Using Standard Humidity Generators

The comparison of two high-range standard humidity generators used by Instituto Nacional de Tecnica Aeroespacial to realize dew-point temperature in the range from -10 degrees C to +95 degrees C has been performed using state-of-the art transfer standards and measurement procedures, over their overlapping range from -10 degrees C to +75 degrees C. The aim of this study is to investigate the level of agreement between the two generators, to determine any bias, and to quantify the level of consistency of the two realizations. The measurement procedures adopted to minimize the effect of the influence factors due to the transfer standards are described, and the results are discussed in the context of the declared calibration and measurement capabilities (CMCs).