An ultraviolet calibration center has been established in Davos, Switzerland. It provides a laboratory forcharacterizing the spectral and angular response of broadband radiometers. The absolute calibration of these instruments is performed through the comparison to the reference spectroradiometer QASUME. We present what we believe to be a novel calibration methodology that explicitly includes the information of the angular and spectral response functions. From the results of the latest broadband intercomparison campaign, the typical uncertainties of these instruments could be obtained. Most radiometers have an expanded uncertainty of approximately 7percent. The angular response introduces an uncertainty of 0.9percent-7.2percent, depending on the cosine error of the radiometer.
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