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English version of VDA dictionary


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U

Uncertainty balance (for one measurement or one calibration) /5/

Table summarising estimate results, or statistical analyses of uncertainty elements which contribute to the uncertainty of measurement results.

Uncertainty interval

Such intervals near tolerance limits where conformity or nonconformity cannot be clearly demonstrated due to measurement uncertainty. If the measurement results Y (the measure values y, including the extended measurement uncertainty U) include a tolerance limit, conformity or nonconformity cannot be demonstrated.

Unit (entity)

Anything that can be described or considered separately.

Upper concentration limit (at OPZ)

Such concentration for which the coincidence error exceeds 5 %.

Urea

An organic compound represented with chemical formula (NH2)2CO