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A bi-lateral intercomparison of erythemal broadband radiometers was performedbetween seven UV calibration facilities. The calibrations provided by theinstruments owners were compared relative to the characterisation andcalibration performed at PMOD/WRC in Davos, Switzerland. The calibrationconsisted in the determination of the spectral and angular response of theradiometer, followed by an absolute calibration performed outdoors relativeto a spectroradiometer which provided the absolute reference.  The characterization of the detectors in the respective laboratories are ingood agreement: The determinations of the angular responses have deviationsbelow ±4% and the spectral responses agree within ±20%. A "blind"intercomparison of the erythemally weighted irradiances derived by therespective institutes and PMOD/WRC showed consistent measurements to within±2% for the majority of institutes. One institute showed slightlylarger deviation of 10%. The differences found between the differentinstrument calibrations are all within the combined uncertainty of thecalibration

Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA