一、测量误差和两类不确定度1.误差和不确定度由于物理量测量的性质,测量结果必然存在误差δ,其定义:δ=测值-真值 (1)真值就是在某一时刻和某一规定条件下的该物理量客观存在的实际值。它在某些情况下是知道的,例如三角形三角之和是180°。但在一般情况下(包括流量测量在内)是不知道的。由于真值未知,所以,在只有测值时,δ也是未知的。但是,如对某量在同一条件 First, the measurement error and two types of uncertainty 1. Error and uncertainty Due to the nature of the physical measurement, the measurement results must exist error δ, its definition: δ = measured value - true value (1) True value is at a certain moment And the objective value of the physical quantity under certain conditions. It is known under some circumstances, for example the sum of the triangle triangles is 180 °. But under normal circumstances (including flow measurement included) is not aware of. Since the true value is unknown, δ is also unknown at the time of measurement. However, as a certain amount of the same conditions