Single Substitution

1 Page 1 SOP 7 – 2019 Page 1 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 SOP 7 Recommended Standard Operating Procedure for Weighing by Single Substitution Using a Single... Open at page → 2 Page 2 SOP 7 – 2019 Page 2 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Verify that the operator is experienced in precision weighing techniques and has had specific tra... Open at page → 3 Page 3 SOP 7 – 2019 Page 3 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 When steps specific to a particular balance are required, they are given in subsections of the pr... Open at page → 4 Page 4 SOP 7 – 2019 Page 4 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Symbols Table 2. Symbols used in this procedure. Symbol Description S standard weight X weight ca... Open at page → 5 Page 5 SOP 7 – 2019 Page 5 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Table 3. Cleaning stabilization. Weight class F1 F2 to M3 After cleaning with alcohol 1 to 2 days... Open at page → 6 Page 6 SOP 7 – 2019 Page 6 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 2.5.1.5 Conduct preliminary measurements to obtain an approximate value for the difference betwee... Open at page → 7 Page 7 SOP 7 – 2019 Page 7 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 2.5.1.7 Adjust the single pan balance or the combination balance so the first two readings of the... Open at page → 8 Page 8 SOP 7 – 2019 Page 8 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Table 6. Optional Sequence B. Measurement No. Weights on Pan Observation 1 X + tx O1 2 S + ts O2... Open at page → 9 Page 9 SOP 7 – 2019 Page 9 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 3.2.2.1 Optional Sequence A (SXX) ( ) 21 32 1 1 1 1 ( ) 1 sX SX a sw swaa a St t St t X a X M M M... Open at page → 10 Page 10 SOP 7 – 2019 Page 10 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 If requested, the apparent mass versus the reference density of brass may be calculated. This va... Open at page → 11 Page 11 SOP 7 – 2019 Page 11 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Where SOP 9 is followed, and check standards are used for 2 to 3 nominal values per balance, mor... Open at page → 12 Page 12 SOP 7 – 2019 Page 12 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Table 7. Example uncertainty budget table. Uncertainty Component Description Symbol Source Typic... Open at page → 13 Page 13 SOP 7 – 2019 Page 13 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 correction value plus the expanded uncertainty must be less than the applicable tolerance to con... Open at page → 14 Page 14 SOP 7 – 2019 Page 14 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Appendix A Single Substitution Data Sheet (Optional Sequence A, SXX) Laboratory data and conditi... Open at page → 15 Page 15 SOP 7 – 2019 Page 15 of 15 This publication is available free of charge from: https://doi.org /10.6028/NIST.IR .6969 - 2019 Appendix B Single Substitution Data Sheet (Optional Sequence B, XSS) Laboratory data and conditi... Open at page →