介绍了轻质油品闭口闪点测定过程中检测结果不确定度的评定方法,从测量程序各步骤评定了不确定度的各项来源,对测量过程中的主要不确定度分量进行了合理评定,包括升温速率;温度计的计量性;计算时数字修约等不确定度分量的评定,最后求得闭口闪点检测结果的合成标准不确定度。为实验室在该项检测过程中进一步提高检测数据的准确性作参考。 This paper introduces the evaluation method of the uncertainty of test results in the determination of the closed flash point of light oil products, evaluates the sources of the uncertainty from each step of the measuring procedure, and makes a reasonable assessment of the main uncertainties in the measurement process , Including the rate of heating; the thermometer’s measurement; the calculation of the number of rounding off uncertainty components such as assessment, and finally closed-end flashpoint test results of the synthesis of standard uncertainty. For the laboratory in the testing process to further improve the accuracy of the test data for reference.