spectroscopy here essentially the time between the registered light pulses is determined using the photon counting module 17 individual photons can be counted finally an oversampling module 18 is provided by which an oversampling analysis of the signal can be performed alternatively also a simple integration this may also be performed by another module for an odd even integration the result signals created by the evaluation modules 15 through 18 are transmitted to an fpga 19 here they are held available which signals are called and forwarded for further processing and evaluation is decided according to a selection criterion which is transmitted to fpga 19 by a control unit 21 via an lvds interface 20 the control unit 21 may be integrated into the lsm in the example shown here it represents an external pc the selection criterion is predetermined by the examination method or manually and the fpga 19 is appropriately programmed and or its switching is changed based on the signal using the selection criterion in the present case a user intends to perform a fluorescence life measurement accordingly the selection criterion is automatically predetermined and only the result signal created by the flim module 15 is displayed by the.