Abstract:Abstract:The working principle and components of smoke point automatic instrument was introduced,the calibration method of smoke point automatic instrument was established.The main calibration items include the indication error and the repeatability.According to the requirements of GB/T 382-2017 test method for smoke point of kerosene and aviation turbine fuel and the experimental data,the calibration items and technical speci?cations were:the indication error not more than ±(1.5% Measuring point+0.5)mm、the repeatability not more than 1mm.The uncertainty of single sampling measurement error was evaluated,the greatest impact on the uncertainty of results is the repeatability uncertainty.When the measuring point of smoke point was 20mm, the relative expanded uncertainty was Urel=3.8%(k=2).