A multi-channel photometer system was installed and put into operation on ASDEX Upgrade in 2008 for studying fast dynamics of broad-band plasma radiation on the microsecond time scale. Linear arrays of silicon photodiodes commonly used for Absolute power measurement in the eXtreme UltraViolet spectral range (AXUV) are encapsulated by pinhole cameras. The plasma is observed by 200 lines of sight, at four different toroidal positions. The AXUV standard detectors have been developed by International Radiation Detectors, Inc [1]. AXUV diodes are characterised by an extremely thin passivation layer, which enables photons of the vacuum-ultraviolet spectral region (VUV) to reach the depletion layer for electron-hole-pair generation. The spectral sensitivity covers the entire energy range from the X-ray down to the visible part of the spectrum. An improvement of the time resolution down to 2μs enlarges the insights into radiation dynamics of fast plasma phenomena like minor and major disruptions, sawteeth and edge localised modes, which are not accessible with usual resistive foil bolometers (1ms time resolution). In this contribution, a short introduction of the diagnostic is followed by the presentation of first measurements taken during disruption mitigation experiments. The analysis is focussed on the asymmetric evolution of toroidal and poloidal emission after the massive injection of gaseous impurities.