Modified Substitution

1 Page 1 SOP 8 – 2019 Page 1 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 SOP 8 Recommended Standard Operating Procedure for Medium Accuracy Calibration of Mass Standards by... Open at page → 2 Page 2 SOP 8 – 2019 Page 2 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Prerequisites Valid calibration certificates with appropriate values and uncertainties must be avai... Open at page → 3 Page 3 SOP 8 – 2019 Page 3 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Table 2. Stabilization time. Temperature Range for the Artifact Minimum Equilibration Time Inside u... Open at page → 4 Page 4 SOP 8 – 2019 Page 4 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Procedure - Option A, Use of Single-Pan Mechanical Balance Select a reference standard of the same... Open at page → 5 Page 5 SOP 8 – 2019 Page 5 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 laboratory, as a rectangular distribution may be included in the uncertainty calculations. Readjust... Open at page → 6 Page 6 SOP 8 – 2019 Page 6 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Procedure - Option B, Use of Full Electronic Balance Select a reference standard of the same nomina... Open at page → 7 Page 7 SOP 8 – 2019 Page 7 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Procedure - Option C, Use of Equal Arm Balance Select a reference standard of the same nominal valu... Open at page → 8 Page 8 SOP 8 – 2019 Page 8 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Drift Evaluation Drift effects will normally be very small. If the drift exceeds 5 % to 10 % (limit... Open at page → 9 Page 9 SOP 8 – 2019 Page 9 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Table 3. Example of weighing sequence. Measurement No. Weights on Pan Observation 1 S O1 2 S + sw O... Open at page → 10 Page 10 SOP 8 – 2019 Page 10 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Table 4. Symbols used. Symbol Description CMi Conventional mass of weight i Ns Nominal value of th... Open at page → 11 Page 11 SOP 8 – 2019 Page 11 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 A t-test may be incorporated to check the observed value of the check standard against the accepte... Open at page → 12 Page 12 SOP 8 – 2019 Page 12 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Standard deviation of the measurement process from control chart performance (See SOP No. 9.) The... Open at page → 13 Page 13 SOP 8 – 2019 Page 13 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Table 5. Example uncertainty budget table. Uncertainty Component Description Symbol Source Typical... Open at page → 14 Page 14 SOP 8 – 2019 Page 14 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 conventional mass correction value plus the expanded uncertainty must be less than the applicable... Open at page → 15 Page 15 SOP 8 – 2019 Page 15 of 15 This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.6969 - 2019 Appendix - Modified Substitution Data Sheet Laboratory data and conditions: Operator Before After... Open at page →