  We have measured the Kondo effect in a quantum ring connected to three
terminals. In this configuration non-linear transport measurements allow to
check which lead contributes to the Kondo density of states (DOS) and which
does not. When the ring is connected to two strongly and one weakly coupled
leads, the measurement of the differential conductance through the weakly
coupled lead allows to probe directly the Kondo DOS. In addition, by applying a
bias between the two strongly coupled leads, we show the splitting of the
out-of-equilibrium DOS.
