Glossar - Details
Extended measurement uncertainty (measurement uncertainty)
A characteristic value that identifies a range for the measurement result that can be expected to comprise a large proportion of the distribution of values that can reasonably be attributed to the measurand.
Note 1: The proportion can be regarded as the coverage probability or confidence level of the range.
Note 2: To associate a specific level of confidence to the range characterized by the extended measurement uncertainty requires explicit or implicit assumptions about the probability distribution characterized by the measurement result and the combined standard uncertainty. The level of reliability that can be attributed to this range can only be known to the extent that such assumptions are justified.
Information: In the GUM and DIN EN ISO 14253-1, extended measurement uncertainty is represented using the formula symbol U. The latest standards, e.g. 3534-2, refer to the upper tolerance limit as U. In order to avoid confusion, this document uses the symbol UMS for the extended measurement uncertainty where the text refers to a measuring system and UMP where the text refers to a measurement process.
Reference Volume (and volume-specific, additional or differing definitions to the standard):
VDA Volume 5 Measurement and inspection processes, 3rd, revised edition, July 2021
A characteristic value that identifies a range for the measurement result that can be expected to comprise a large proportion of the distribution of values that can reasonably be attributed to the measurand.
Note 1: The proportion can be regarded as the coverage probability or confidence level of the range.
Note 2: To associate a specific level of confidence to the range characterized by the extended measurement uncertainty requires explicit or implicit assumptions about the probability distribution characterized by the measurement result and the combined standard uncertainty. The level of reliability that can be attributed to this range can only be known to the extent that such assumptions are justified.
Information: In the GUM and DIN EN ISO 14253-1, extended measurement uncertainty is represented using the formula symbol U. The latest standards, e.g. 3534-2, refer to the upper tolerance limit as U. In order to avoid confusion, this document uses the symbol UMS for the extended measurement uncertainty where the text refers to a measuring system and UMP where the text refers to a measurement process.
Reference Volume (and volume-specific, additional or differing definitions to the standard):
VDA Volume 5 Measurement and inspection processes, 3rd, revised edition, July 2021