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In this work we show an approach for the calibration of barometers developed in conjunction between the National Metrological Institute (INM) that uses a barometric chamber, with the Institute of Hydrology, Meteorology and Environmental Studies of Colombia (IDEAM) that uses an automated calibration system at the Instruments and Methods of Observation. The INM-IDEAM calibration method a reference pressure value is stablished between 400 hPa to 1100 hPa, and then record the pressure on the test and reference instruments at steps of 60s or less, if the configuration of the instruments allows it, by no less than two hours, the process is repeated for our the interest points in the interval. After that, the mean difference between the value recorded by the reference standard and the device under test is calculated as the calibration error and the standard deviation of the error are the repeatability is a component for the uncertainty estimation. The results obtained by this method allows to look up the recommendations of the World Meteorological Organization Guide to Meteorological Instruments and Methods of Observation, WMO-No. 8 and the results are more suitable with the long-term, high-quality and uninterrupted measuring of the atmospheric pressure that the barometers make in their daily use. We also calibrate the instruments using the standard calibration procedure that is performed at several pressure points by increasing and decreasing pressures in four measuring series, standard calibration process of increasing and decreasing. The standard calibration pressures has the issue that the reference pressure is hard to reproduce with the INM and IDEAM systems, leading to an increase of the calibration uncertainty. An comparison of the two methods is made.
Topic : Theme 1: Atmospheric Chemistry and Physics.
Reference : T1-A37
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