Abstract: The invention relates to a method and a system for photodetection in which measurement signals during photon-counting operation and current operation can be tapped off in parallel at a photomultiplier through two channels, one of which is a photon-counting (pulse-counting) channel and the other an analog signal transfer channel. The signals are stored continuously and processed in a microprocessor. The two-channel operation allows the dynamic range of the photomultiplier to be expanded, in which, for each time interval, the measured value for the light to be measured is selected on the basis of an adjustable range limit from the channel that operates as a photon counter or the channel that is operated in the current mode.

Abstract: The invention concerns a measuring device for carrying out of chemiluminescence and/or fluorescence measurements of fluid samples, which in sample containers (22) of a sample plate (24) are contained. For analysis of a measurement light exiting from an upper measurement opening (26) of a sample container (22) found in a measurement position, a photo-multiplier (12) is provided, which for achievement of a flat device construction is provided lying down. In order that the measurement light is redirected into the entry window (36) of the photo-multiplier (12) there is provided a reflector (16) before the photomultiplier (12) in the carrier body (14) which covers over at least the measurement opening (26) of the sample container (22) to be measured, at a distance (FIG. 1).