Within the framework of EUROMET Project No. 308, a set of five metallic wires of diameters between 0,05 mm and 1 mm was circulated and calibrated by the national metrology institutes of the United Kingdom, Switzerland, Germany and France. Diametral measurements were made in the middle of each wire in four different directions approximately 45 apart with the aim of assessing variations in diameter. No special measurement procedure was prescribed: each participating laboratory had to follow its own measurement procedure. The comparison reflects the state-of-the-art for small external diameter measurement in the Western European national metrology institutes.
Using techniques for the propagation of distributions to estimate uncertainties is becoming increasingly popular in metrology. Here we describe the calculation for the estimation of uncertainties in hygrometry using this method. This work is based on investigations on the two-temperature moist gas generator at Laboratoire National d'Essais.After a brief introduction on the calibration principles of hygrometers, models and calculation for estimating uncertainties using a Monte Carlo simulation are presented. Results concerning dew point temperature and relative humidity are shown, and compared with results obtained with the law of propagation of uncertainties (traditional method).The importance of the moist gas temperature measurement with regard to the saturator and the test chamber is confirmed. Moreover, results observed with the propagation of distributions and the traditional method are coherent.
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