EURAMET project to examine underlying parameters in radiance temperature scale realisation, 156 °C to 1000 °C.

Over the medium temperature range (from 156 ◦ C to 1000 ◦ C), radiation thermometry is usually established within a national metrology institute (NMI) by means of variable temperature blackbody radiation sources, whose temperature is determined using a platinum resistance thermometer or thermocouple, calibrated in terms of the International Temperature Scale of 1990 (ITS-90), positioned in close