1.80 measurement function Function of quantities, the value of which, when calculated using known quantity values for the input quantities in a measurement model, is a measured quantity value of the output quantity in the measurement model. Note 1: If a measurement model h(Y, X1, …, Xn) = 0 can explicitly be written as Y = f(X1,…, Xn), where Y is the output quantity in the measurement model, the function f is the measurement function. More generally, f may symbolize an algorithm, yielding for input quantity values x1,…, xn a corresponding unique output quantity value y = f(x1,…, xn). Note 2: A measurement function is also used to calculate the measurement uncertainty associated with the measured quantity value of Y. Source: [VIM 2.49].
 1.80 measurement function Function of quantities, the value of which, when calculated using known quantity values for the input quantities in a measurement model, is a measured quantity value of the output quantity in the measurement model. Note 1: If a measurement model h(Y, X1, …, Xn) = 0 can explicitly be written as Y = f(X1,…, Xn), where Y is the output quantity in the measurement model, the function f is the measurement function. More generally, f may symbolize an algorithm, yielding for input quantity values x1,…, xn a corresponding unique output quantity value y = f(x1,…, xn). Note 2: A measurement function is also used to calculate the measurement uncertainty associated with the measured quantity value of Y. Source: [VIM 2.49].

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