BS 7996:2018 – TC:2020 Edition
$217.84
Tracked Changes. Torque measuring devices. Calibration and classification using continual torque application. Method
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 102 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 63 | Foreword |
| 65 | 1 Scope 2 Normative references 3 Terms, definitions, abbreviations and symbols |
| 68 | 4 Preparation for calibration 4.1 Reference standard |
| 69 | Table 1 — Uncertainty of calibration torques 4.2 Condition and identification of a torque measuring device |
| 70 | 4.3 Resolution of the indicator |
| 71 | 4.4 Lower limit of calibration, Tmin 4.5 Rate of applied torque |
| 72 | 4.6 Number of calibration orientations (see Annex A) 5 Preliminary procedure 5.1 Alignment 5.2 Temperature considerations |
| 73 | 5.3 Instrumentation set-up 5.4 Preloading procedure 6 Calibration procedure 6.1 Selection of calibration torques |
| 74 | 6.2 Application of calibration torques 6.3 Torque application rate validation 7 Calculation of results 7.1 Determination of deflection, d |
| 75 | 7.2 Determination of relative repeatability, R1 7.3 Determination of relative reproducibility, R2 |
| 76 | 7.4 Determination of relative errors of interpolation, Eit and Eitd 7.5 Determination of relative residual deflection, R0 |
| 77 | 7.6 Determination of relative reversibility, R3 7.7 Determination of relative errors of indication, Ei and Eid 7.8 Determination of uncertainty of measurement and relative measurement uncertainty interval 8 Classification of torque measuring devices 8.1 General |
| 78 | 8.2 Determination of a classification and its range |
| 79 | Table 2 — Criteria for classification of torque measuring devices 9 Calibration certificate |
| 81 | Annex A (informative) Orientation diagrams Figure A.1 — Continuous application of torque |
| 82 | Figure A.2 — Examples of preloading and calibration sequences for a torque measuring device |
| 83 | Annex B (normative) Method and examples of determining uncertainty of the calibration results of the torque measuring device |
| 86 | Table B.1 — Summary of worked examples |
| 87 | Table B.2A — Worked example in torque units: 100 N∙m torque measuring device clockwise torque, incremental series only Table B.2B — Worked example in torque units: 100 N∙m torque measuring device clockwise torque, incremental series only Table B.2C — Worked example in torque units: 100 N∙m torque measuring device clockwise torque, incremental series only |
| 88 | Table B.3A — Uncertainties calculated in accordance with B.3 Table B.3B — Uncertainties calculated in accordance with B.3 |
| 89 | Figure B.1 — Worked example in torque units: Deviation as a function of applied torque |
| 90 | Table B.4A — Worked example in mV/V: 2 kN∙m torque measuring device clockwise torque, incremental series and decremental series |
| 91 | Table B.4B — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series |
| 92 | Table B.4C — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series |
| 93 | Table B.5A — Uncertainties calculated in accordance with Annex B |
| 94 | Table B.5B — Uncertainties calculated in accordance with Annex B |
| 95 | Table B.6A — Uncertainty interval calculated in accordance with Annex B Table B.6B — Uncertainty interval calculated in accordance with Annex B |
| 96 | Figure B.2 — Worked example in mV/V: Sensitivity as a function of applied torque Annex C (informative) Bandwidth |
| 97 | Figure C.1 — Examples of level torque signal response (acceptable) and -3 dB response (not acceptable) |
| 98 | Figure C.2 — Illustration of data skew between an instantaneous torque value and the value due to sample points timing |
| 100 | Bibliography |
