WRR

the World Radiometric Reference, which provides the basis for all measurements byradiometers in the world. Every five years, many of the bestabsolute cavity radiometers undergoan intercomparison at PMOD/WRC (Davos, Switzerland). The moststable, accurate, and precise instruments provide the World Radiometric Reference for the comingyears. Any credible radiometer measurement must be traceable to the WRR.