The quasistatic and nonequilibrium response of an m.o.s. system containing bulk traps under constant gate-current conditions is analysed. It is shown that a particular advantage of the method is that the total semiconductor capacitance can be extracted directly from the curves, thus easing the analysis of quasistatic results for obtaining interface state density. For a specific range of operating conditions the resulting nonequilibrium characteristic is rich in structure, which allows for analysis of the bulk properties of the semiconductor.