Experimental Evaluation of Instrumental Corrections for an Electrically-calibrated Absolute Radiometer

Results are presented on the experimental evaluation of the instrumental corrections required by various imperfections in the measuring process for Istituto Elettrotecnico Nazionale electrically-calibrated absolute radiometers. Time constant, linearity, lead-heating effect and response variations across the surface have been evaluated using an ad-hoc algorithm implemented for measuring the low radiant powers involved in the measurements.