Open Access
Table 2
Uncertainty budget for HB by GUM without correlated inputs.
| Quantity | Value | Standard uncertainty | Distribution | Sensitivity coefficient | Uncertainty contribution |
|---|---|---|---|---|---|
| Force (F), N | 1835.78 | 1.26 | Normal | 0.054 | 0.034 |
| Ball diameter (D), mm | 2.49900 | 2.16 × 10−3 | Normal | 9.4 | 0.01 |
| Indentation diameter (d), mm | 1.469 | 4.509 × 10−3 | Normal | −150 | −0.34 |
| The expanded uncertainty | ±0.69 HB | Coverage factor 2 at confidence level 95% | |||
| Mean value | 100 HB | ||||
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