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5 合成标准不确定度的评定5 1 无关输入量(1)合成标准不确定度ｕｃ(ｙ)是合成方差ｕｃ2 (ｙ)的正平方根 ,它由下式确定 :ｕｃ2 (ｙ) =∑Ｎｉ=1 ｆ ｘｉ2 ｕ2 (ｘｉ) (15)注 :①其中 ｆ是式 (2 )中函数 ,各ｕ(ｘｉ)是 (Ａ类评定的 )标准不确定度或 (Ｂ类评定的 )标准不确定度
5 Evaluation of Synthetic Standard Uncertainty 5 1 Irrelevant Input (1) Synthetic Standard Uncertainty uc (y) is the square root of the synthetic variance uc2 (y), which is determined by: uc2 (y) = ΣNi = 1 f xi2 u2 (xi) (15) Note: (1) where f is a function in Eq. (2) and u (xi) is the standard uncertainty (assessed for Class A) or the standard uncertainty