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Expanded uncertainty (k = 2) in radiance temperature for the Cs or Na pressure-controlled heatpipe blackbody source at 800 °C. The uncertainty is given for two different target diameters of the radiation thermometer
| Factor | Radiation thermometer target diameter (mm) | |
|---|---|---|
| 1.0 | 10 | |
| BB Emissivity | 0.02 | 0.02 |
| Au/Pt thermocouple | 0.01 | 0.01 |
| Digital voltmeter & ice bath | 0.00 | 0.00 |
| Pressure stability | 0.02 | 0.02 |
| RT noise | 0.02 | 0.02 |
| BB radiance uniformity | 0.06 | 0.57 |
| Total | 0.07 | 0.57 |
