一切测量都不可避免地存在误差,而测量结果便表现为一定范围内的不确定性。因此,一个完整的测量结果不仅要包含被测量的数值和单位,还应包含对测量结果的可信赖程度评定的数值。JJF1059-1999《测量不确定度评定与表示》给出不确定度的定义为:表征合理地赋予被测量之值的分散性, All measurements are inevitably error, and the measurement results showed a certain range of uncertainty. Therefore, a complete measurement should include not only the values ​​and units to be measured, but also the values ​​that should be assessed for the reliability of the measurements. JJF1059-1999 “Measurement Uncertainty Evaluation and Expression” gives the definition of uncertainty is: characterization of the measured values ​​assigned to a reasonable dispersion,