3 1 Weighing Design

1 Page 1 SOP 5 – 2019 Page 1 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 SOP 5 Recommended Standard Operating Procedure for Using a 3- 1 Weighing Design 1 Introduction Purp... Open at page → 2 Page 2 SOP 5 – 2019 Page 2 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 The balance that is used must be in good operating condition with sufficiently small process standa... Open at page → 3 Page 3 SOP 5 – 2019 Page 3 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 2 Methodology Scope, Precision, Accuracy This method can be performed on any type of balance or mas... Open at page → 4 Page 4 SOP 5 – 2019 Page 4 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Forceps and gloves must be selected to avoid damage or contamination to mass standards. Stop watch... Open at page → 5 Page 5 SOP 5 – 2019 Page 5 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Symbols Table 2. Symbols used in this procedure. Symbol Description S standard reference weight X w... Open at page → 6 Page 6 SOP 5 – 2019 Page 6 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 the mass of the weight should, if possible, be determined before cleaning. 2.5.1.3 If weights are c... Open at page → 7 Page 7 SOP 5 – 2019 Page 7 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Table 4. Minimum equilibration times. 5 ΔT a Nominal Mass 6 OIML Class E1 (time in h) OIML Class E2... Open at page → 8 Page 8 SOP 5 – 2019 Page 8 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Table 5. Weighing Design Matrix. Weight ID Comparison S X S c a1 + - a2 + - a3 + - Standard (Restra... Open at page → 9 Page 9 SOP 5 – 2019 Page 9 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Table 7. 12 Measurement Observations. Double Substitution Measurement Number Weights on Pan Observa... Open at page → 10 Page 10 SOP 5 – 2019 Page 10 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Calculate the F statistic which compares the observed within process standard deviation, s w, to t... Open at page → 11 Page 11 SOP 5 – 2019 Page 11 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Calculate the least -squares measured difference, d x, for X . 123 x 2a a +a d= 3 −− Eqn. (7) Calc... Open at page → 12 Page 12 SOP 5 – 2019 Page 12 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 SOP 5 weighing design integrates a suitable check standard (See NISTIR 6969, GLP 1, SOP 9, and SOP... Open at page → 13 Page 13 SOP 5 – 2019 Page 13 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Weighing Designs”, for detailed instructions on calculating the uncertainty components which are r... Open at page → 14 Page 14 SOP 5 – 2019 Page 14 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 5.2.1.2 When the laboratory has the confidence associated with a well characterized measurement pr... Open at page → 15 Page 15 SOP 5 – 2019 Page 15 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Table 8. Example Uncertainty B udget Table. Uncertainty Component Description Symbol Source Typica... Open at page → 16 Page 16 SOP 5 – 2019 Page 16 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 6 Certificate Report results as described in NISTIR 6969, SOP No. 1, Preparation of Calibration Ce... Open at page → 17 Page 17 SOP 5 – 2019 Page 17 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Appendix A Observation Sheet for 3-1 Weighing Design When Tare Weights Are Used Laboratory data an... Open at page → 18 Page 18 SOP 5 – 2019 Page 18 of 18 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.5672 - 2019 Appendix B – Flow Chart of the 3-1 Weighing Design Process Calculate dx, Mx, CMx Uncertainty Prepa... Open at page →