The aim of this work package is to establish relative primary radiometric temperature scales at the less experienced NMIs/DIs with uncertainties less than 0.6 °C at 1500 °C and 1 °C at 2000 °C. In Task 3.1, three institutes (JV, DFM and TUBITAK) will construct suitable radiation thermometers to be used as interpolating instruments. In addition, appropriate characterisation tools will be established, in particular to measure the SSE property of the radiometers. Task 3.2 will develop the computational tools and implement the actual improved radiometric high-temperature scale above the silver point (961.78 °C) by performing calibration experiments using the fixed-point cells constructed in Task 2.2 and reporting the results in a peer reviewed paper. Task 3.3 will compare the interpolation scales established in Task 3.2 to realisations of the ITS-90.

WP leader: Humbet Nasibli (Tubitak-UME)