Comparative Analysis of Approaches to Uncertainty Evaluation of Indirect Correlated Measurements

Two approaches to uncertainty evaluation of indirect correlated measurements are considered: the approach described in the GUM and the approach based on the reduction method. The main expressions for evaluation of the numerical value of the measurand, its standard and expanded uncertainty are given. The advantages of the reduction method are shown. An example of uncertainty evaluation of electrical resistance measuring using the ammeter-voltmeter method is considered.