测量结果与被测量真值之差。测量结果是量的实验表现，通常只是对测量所得被测量值的近似或估计。真值是量的定义的完整体现，只有通过完善的测量才能求得，它反映了人们力求接近的理想、目标或客观真理，本质上是不能确定的，实际上用的是约定真值，须以测量不确定度来表征其 The difference between the measured result and the measured true value. The result of the measurement is the experimental performance of the quantity, which is usually only an approximation or estimation of the measured value to be measured. True value is the complete embodiment of the definition of quantity and can only be obtained through perfect measurement. It reflects the ideal, objective or objective truth sought by people, which is inherently indeterminate. In fact, the truth value is agreed to It is characterized by measurement uncertainty