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Title: A Summary Look At Uncertaintids In Dimensional Measurements Made At Nonstandard Temperatures
Author: Dennis A. Swyt
Source: 1994 Measurement Science Conference
Year Published: 1994
Abstract: A recent IS0 proposal to change the international standard reference temperature for dimensional measurements from 20 C to 23 C, while unadopted, is of technical import l. Since referring measurements to a standard temperature serves to reduce actual variations in dimensions of parts due to thermal-expansion effects as well as uncertainty in measurements, a shift in reference temperature can increase each, that is, both variations and uncertainties. This is an extract of an extended NIST paper which looks at possible errors and likely uncertainties in dimensional measurements due to thermal-expansion effects where those measurements are made away from the reference temperature 2, either the specific interval of 3 C due to a change to the proposed 23 C or an arbitrary interval due, for example, to the settling of a temperature control system at other than the standard reference temperature.

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