  We consider the differential conductance of a periodically driven system
connected to infinite electrodes. We focus on the situation where the
dissipation occurs predominantly in these electrodes. Using analytical
arguments and a detailed numerical study we relate the differential
conductances of such a system in two and three terminal geometries to the
spectrum of quasi-energies of the Floquet operator. Moreover these differential
conductances are found to provide an accurate probe of the existence of gaps in
this quasi-energy spectrum, being quantized when topological edge states occur
within these gaps. Our analysis opens the perspective to describe the
intermediate time dynamics of driven mesoscopic conductors as topological
Floquet filters.
