1.1 This specification covers various classes of weights and mass standards used in laboratories. Weights used for commercial measurements are excluded, except that one class of standards designed for the calibration of commercial test weights is included. Tolerances and design restrictions for each class are described in order that both individual weights or sets of weights can be chosen for appropriate applications (see Note). In general, this specification replaces, in function, National Bureau of Standards Circular 547, Section 1, which is out of print. Note-Although metric weights are almost exclusively used in laboratories, tolerances are given in this specification for nonmetric weights in U.S. customary units for all classes. It is anticipated that as metrication, even in test laboratories, proceeds further, the nonmetric tables given in this specification will become obsolete. 1.2 This specification recognizes International Recommendation No. 1 (cylindrical weights from 1 g to 10 kg of average precision) and International Recommendation No. 20 (weights of classes of precision E1, E2, F1, F2, and M1 from 50 kg to 1 mg). Where appropriate, it is recommended that these International Recommendations be used. |
OIML D 28 | Conventional Value of the Result of Weighing in Air (2004) |
OIML R111–1e04 | Weights of classes E1, E2, F1, F2, M1, M1-2, M2, M2-3 and M3 Part 1: Metrological and Technical Requirements (2004) |
VIM: JCGM 200:2012 | International Vocabulary of Metrology-Basic and General Concepts and Associated Terms |
GUM: JCGM 100:2008 | Evaluation of Measurement Data-Guide to the Expression of Uncertainty in Measurement |
EURAMET/cg-18/V. 3.0 | Guidelines on the Calibration of Non-Automatic Weighing Intruments (2011) |
CIPM-2007 | Revised Formula for the Density of Moist Air, A. Picard, R. S. Davis, M. Glaser, and K. Fujii |
NISTIR 6969 | Selected Laboratory and Measurement Practices to Support Basic Mass Calibrations (2012) |
NISTIR 5672 | Advanced Mass Calibration and Measurement Assurance Program for State Calibration Laboratories (2012) |
NIST SP 1038 | The International System of Units (SI) - Conversion Factors for General Use (May 2006) |
NIST SP 811 | Guide for the Use of the International System of Unit (SI) 2008 Edition |
NIST Handbook 143 | State Weights and Measures Laboratories Program Handbook (2007) |
NIST Technical Note 1297 | (1994) Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results |
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