An improved device for measuring the time of occurrence of a pulse centroid, particularly for irregularly shaped electrical pulses. An electrical pulse is fed to a first integrator whose output is fed to a summing network and a second inverting integrator. The output from the second integrator is also fed to the summing network. The output of the summing network is then fed to a zero crossing detector which provides an output related in time to the time of occurrence of the pulse centroid.