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Table 3
Uncertainty budget of the two-temperature generator at +10 °C dew-point temperature.
| Method of estimation | Standard uncertainty | Sensitivity coefficient | Divisor | Distribution | Value | Symbol | Source |
|---|---|---|---|---|---|---|---|
| Standard deviation of measurements | 0.0013 | 1 | 1 | Normal | 0.0013 | First SPRT Rep. | Repeatability for first SPRT |
| Standard deviation of measurements | 0.0002 | 1 | 1 | Normal | 0.0002 | Second SPRT Rep. | Repeatability for Second SPRT |
| Calibration certificate | 0.001 | 1 | 1 | Normal | 0.002 | u(t s sprt cal) | First SPRT calibration |
| Difference between maximum and minimum value of measurements | 0.0035 | 1 | √3 | Rectangular | 0.006 | u(t s stab) | First bath stability |
| Calibration certificate | 0.001 | 1 | 1 | Normal | 0.002 | u(t s sprt cal) | Second SPRT calibration |
| Difference between maximum and minimum value of measurements | 0.00578 | 1 | √3 | Rectangular | 0.01 | u(t s stab) | Second bath stability |
| Digital indicator = 0.5 of resolution | 0.00006 | 1 | √3 | Rectangular | 0.0001 | u(t s ind res) | SPRT resolution (indicator unit) |
| Calibration certificate | 0.00025 | 1 | 1 | Normal | 0.0005 | u(t s cal) | Bridge calibration |
| The temperature difference between bath temperature that containing the saturator and the air temperature inside the saturator |
0.0050 | 1 | 1 | Normal | 0.0050 | u(t s sat eff) | Saturator efficiency |
| The temperature difference between saturator inlet and exit |
0.00578 | 1 | √3 | Rectangular | 0.01 | u(t s sat hom) | Saturator homogeneity |
| Difference between maximum and minimum value of measurements | 0.00279 | 1 | √3 | Rectangular | 0.0048 | u(t s sat stab) | Saturator temperature stability |
| The temperature difference between bath temperature that contains the test chamber and the air temperature inside the test chamber | 0.0055 | 1 | 1 | Normal | 0.0055 | u(t s cham eff) | Test chamber efficiency |
| The temperature difference between test chamber inlet and exit |
0.01 | 1 | √3 | Rectangular | 0.01 | u(t scham hom) | Test chamber homogeneity |
| Difference between maximum and minimum value of measurements | 0.003 | 1 | √3 | Rectangular | 0.0005 | u(t s cham stab) | Test chamber temperature stability |
| Calibration certificate | 0.03 | 1 | 1 | Normal | 0.06 | u(t m cal) | Dew-point hygrometer |
| Digital indicator = 0.5 of resolution | 0.0057 | 1 | √3 | Rectangular | 0.005 | u(t mhygro res) | Resolution of hygrometer |
| 0.33 | Combined uncertainty | ||||||
| ±0.0659 | Expanded uncertainty (k = 2) |
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