NIST-DOE CALIBRATION COOPERATION LOWERS UNCERTAINTY FOR STEP GAGE CALIBRATION.A NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. scientist, and the staff of the Department of Energy (DOE) Oak Ridge Oak Ridge, city (1990 pop. 27,310), Anderson and Roane counties, E Tenn., on Black Oak Ridge and the Clinch River; founded by the U.S. government 1942, inc. as an independent city 1959. Metrology Center have analyzed 5 years of measurements of their check standards and customer step gages Gages Devices for determining the relative size or shape of objects. The function of gages is to determine whether parts are within or outside of the specified tolerances, which are expressed in a linear unit of measurement. and revised the error budget for the calibration calibration /cal·i·bra·tion/ (kal?i-bra´shun) determination of the accuracy of an instrument, usually by measurement of its variation from a standard, to ascertain necessary correction factors. . The uncertainty is length dependent, but as an example--for a full meter, the uncertainty is 0.4 [micro]m, a significant reduction from the previous 0.7 [micro]m. The reduction is primarily due to a number of small process improvements. The new uncertainty is available on most one-dimensional calibrations up to 1.5 m. |
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