Open Access
Table 2
Uncertainty budget for the resistor 10 MΩ.
| Uncertainty sources |
Probability distribution | Divider | Uncertainty contribution by voltage, Ω | Uncertainty contribution by current, Ω |
|---|---|---|---|---|
| Repeatability (Type A) | Normal | 1 | 59 | 144 |
| Applied signal calibration (B1) | Normal | 2 | 0.6 | 0.3 |
| Calibration of Rs (B2) | Normal | 2 | 45 | 45 |
| Drift of Rs (B3) | Rectangular |
|
0.3 | 0.3 |
| Temperature coefficient of Rs (B4) | Rectangular |
|
12 | 12 |
| DMM ratio accuracy (B5) | Normal | 2 | 1 | 1 |
| Combined standard uncertainty (Uc ) | ± 75 Ω | ± 151 Ω | ||
| Effective degrees of freedom | ∞ | ∞ | ||
| Expanded uncertainty (U exp.) at confidence level 95%, (k = 2): | ± 150 Ω = 15 μΩ/Ω | ± 302 Ω = 30.2 μΩ/Ω | ||
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