Influence Factors and Uncertainty Analysis of Relative Humidity Measured by Psychrometer

Abstract Based on the measurement principle of psychrometer and experimental data, influence wind speed humidity is analyzed, uncertainty measured by evaluated GUM method. The research results show that under condition high temperature humidity, relative not sensitive to speed. When 90%RH air 85°C, difference calculated using different coefficients 0.03% RH. With decrease dry-bulb gradually increases. 20%RH 20°C, 2.64% main introduced coefficient which a function Measurement decreases with increase while at same temperature.