Table 1.
Quoted uncertainties (3σ) of current NIST measurement services for radiation thermometry, radiometry, and photometry and estimated changes in reported values resulting from a −0.25 K reassignment of the gold-point temperature
| Quantity | Uncertainty | Change of value |
|---|---|---|
| Radiance temperature [4] | ||
| 800 °C | ±0.5 °C | −0.2 °C |
| 1100 | 0.6 | −0.2 |
| 1400 | 0.8 | −0.4 |
| 1800 | 1.3 | −0.6 |
| 2300 | 2.0 | −0.9 |
| Spectral radiance [3] | ||
| 250 nm | ±1.6% | −0.8% |
| 350 | 1.2 | −0.6 |
| 650 | 0.6 | −0.3 |
| 900 | 0.5 | −0.2 |
| 1600 | 0.4 | −0.1 |
| 2400 | 0.4 | −0.1 |
| Spectral irradiance [5] | ||
| 250 nm | ±2.3% | −0.8% |
| 350 | 1.4 | −0.6 |
| 650 | 1.0 | −0.3 |
| 900 | 1.3 | −0.2 |
| 1600 | 1.9 | −0.1 |
| 2400 | 6.5 | −0.1 |
| Luminous intensity [6] | ||
| 2856 K | ±1.0% | −0.4% |
| Luminous flux [6] | ||
| 2856 K | ±1.4% | −0.4% |