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Session Topic: 3A, Quality Session

   

Paper Title: NISTIR 6855: Overview of the Recommended Guide for Determining and Reporting Uncertainties for Balances and Scales

   

Date & Time: TUESDAY, August 6, 2002

 

8:30 - 10:00am - PARALLEL SESSIONS - SESSION 3

   

Speaker: Val Miller NIST

Email: val.miller@nist.gov

   

As scale and balance service organizations have become ISO 9000 registered or accredited to ISO Guide 25 and ANSI/NCSL Z540-1-1994, now implemented as ISO/IEC 17025, the number of requests for assistance in calculating the uncertainty of a scale or balance calibration have dramatically increased. It has become evident that a practical guide is needed to explain the calculation of uncertainty in a manner usable by field service personnel who are not trained statisticians. ISO/IEC 17025 states that a calibration laboratory or testing laboratory performing calibrations shall have and shall apply a procedure to estimate the uncertainty of measurement for all calibrations. This guide will attempt to clarify the concepts of calculating scale or balance calibration uncertainty, by providing specific examples, and making the interpretation of the various methodologies understandable to field personnel.

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