BS 7882:2017 – TC:2020 Edition
$217.84
Tracked Changes. Method for calibration and classification of torque measuring devices
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 84 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 51 | Foreword |
| 53 | 1 Scope 2 Terms, definitions, abbreviations and symbols |
| 55 | 3 Preparation for calibration 3.1 Reference standard Table 1 — Uncertainty of calibration torques |
| 56 | 3.2 Condition and identification of a torque measuring device 3.3 Resolution of the indicator |
| 57 | 3.4 Lower limit of calibration, Tmin 3.5 Number of calibration orientations (see Annex A) |
| 58 | 4 Preliminary procedure 4.1 Alignment 4.2 Temperature considerations 4.3 Instrumentation set-up 4.4 Preloading procedure 5 Calibration procedure 5.1 Selection of calibration torques |
| 59 | 5.2 Application of calibration torques 6 Calculation of results 6.1 Determination of deflection, d |
| 60 | 6.2 Determination of relative repeatability, R1 6.3 Determination of relative reproducibility, R2 |
| 61 | 6.4 Determination of relative errors of interpolation, Eit and Eitd |
| 62 | 6.5 Determination of relative residual deflection, R0 6.6 Determination of relative reversibility, R3 6.7 Determination of relative errors of indication, Ei and Eid |
| 63 | 6.8 Determination of uncertainty of measurement and relative measurement uncertainty interval 7 Classification of torque measuring devices 7.1 General 7.2 Determination of a classification and its range |
| 64 | Table 2 — Criteria for classification of torque measuring devices 8 Calibration certificate |
| 66 | Annex A (informative) Orientation diagrams Figure A.1 — Example of preloading and calibration sequences for a torque measuring device with round shaft drives, six incremental and decremental torques, classes 0.05 to 5.0 |
| 68 | Annex B (normative) Method example of determining uncertainty of the calibration results of the torque measuring device |
| 71 | Table B.1 — Summary of worked examples Table B.2 — Worked example in torque units: 100 N·m torque measuring device clockwise torque, incremental series only |
| 72 | Table B.2 — Worked example in torque units: 100 N·m torque measuring device clockwise torque, incremental series only (continued) Table B.2 — Worked example in torque units: 100 N·m torque measuring device clockwise torque, incremental series only (continued) Table B.3 — Uncertainties calculated in accordance with B.3 |
| 73 | Table B.3 — Uncertainties calculated in accordance with B.3 (continued) |
| 74 | Table B.4 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series Table B.4 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series (continued) |
| 75 | Table B.4 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series (continued) Table B.5 — Uncertainties calculated in accordance with Annex B |
| 76 | Table B.5 — Uncertainties calculated in accordance with Annex B (continued) Table B.6 — Uncertainty interval calculated in accordance with Annex B |
| 77 | Table B.6 — Uncertainty interval calculated in accordance with Annex B (continued) |
| 78 | Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental and decremental series |
| 79 | Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series (continued) Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series (continued) |
| 80 | Table B.8 — Uncertainties calculated in accordance with Annex B Table B.8 — Uncertainties calculated in accordance with Annex B (continued) |
| 81 | Table B.9 — Uncertainty interval calculated in accordance with Annex B Table B.9 — Uncertainty interval calculated in accordance with Annex B (continued) |
| 82 | Bibliography |
