To prove a part is "bad," the measured value must fall outside the specification zone by a margin at least equal to the expanded measurement uncertainty (
is the definitive international standard for determining whether a product meets its design specifications while accounting for the unavoidable presence of measurement uncertainty. international standard iso 14253 1pdf exclusive
In traditional manufacturing, a part was often accepted if the measured value fell within the tolerance limits. ISO 14253-1 changes this by introducing the concept of "proof beyond a reasonable doubt". Conformity (Passing): To prove a part is "bad," the measured