ASME B89.7.3.3:2002 pdf free download.UIDEINES FOR ASSESSNG THE RELIABILITY OF DIMENSIONAL MEASUREMENT TAINTY STATEMENTS.
The GUM provides a unified, consistent means for calculating mcasurenment unceriainiy. Failure to follow the procedures described in the GUM may result in a substantially different uncertainty statement. Procedures for calculating measurement uncertainty arc well described in the GUM, a nationally and intemationally recognized document. Deviations from this approach,
e.g. algcbraically summing unccrtainty componenis,will lead to disagreemcnts betwecn uncertainty budgets and should be avoided. Common ways of faling to comply with the GUM include not accounting for known systematic errors (GUM 3.2 and F.2.4.5) and not using the law of propagation of uncertainty (GUM 5.1.2) (or some other appropriate means of combining
uncertainty sources such as computer simulation). While it is recommended that corrections for all known systematic errors be applied to the measurement resul, in some cases this is economically undesirable; a discussion of the inclusion of uncorrected systematic errors in
uncertainty statements can be found in Phillips, Eberhardt, and Parry.
4.4 Pooriy Reaiized or incompieteiy Defined
Measurand Measurement results and their uncertainties are associated with a particular measurand. The numerical value associaled with some measurands may be time dependent; i.e.. the value realized by a measurement could change in ime due 10 degradation, temporal insability,
wear, or damage. Two measurements separated in time could realize two diffcrent vaiues for a weil- specified measurand. A cormmon example is damage to the product under consideraion (particularly in uransporl) which systematically changes the value associated with the measurand. (The measurand itscelf, which is a set of specifications, remains unchanged.One
method of detecting this problem involves examining the consistency of repeated measurements separated in time, e.g. before and after transport.
ASME B89.7.3.3:2002 pdf free download
