Estimating the Uncertainty of Spacial and Time Average Measurements

[+] Author and Article Information
J. S. Wyler

Steam Turbine Division, Westinghouse Electric Corp., Lester, Pa.

J. Eng. Power 97(4), 473-476 (Oct 01, 1975) (4 pages) doi:10.1115/1.3446036 History: Received July 24, 1974; Online July 14, 2010


The uncertainty of average measurements has been investigated, and a generalized formula for the standard deviation of spacial and time average measurements has been derived. The special cases of spacial averages and time averages have been considered resulting in recommendations concerning choice of instrumentation and the number of time independent measurements needed. A simplified procedure for estimating the number of additional measurements required to reduce the uncertainty interval to a certain level is also presented.

Copyright © 1975 by ASME
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