Characterization device for characterizing a power switch , comprising: - a power supply node , intended to be connected to a first conduction electrode of the power switch to be characterized; - a power supply circuit ; the power supply circuit comprising: - a first DC voltage source generating a first power supply potential; - a first diode connected in series between the first DC voltage source and said power supply node, and connected so that a forward current flows through it from the first voltage source to said power supply node; - a second DC voltage source generating a second power supply potential greater than the first power supply potential; - a first resistor connected in series between the second DC voltage source and said power supply node ; - a voltage-clipping circuit comprising: - a third DC voltage source ; - a second resistor and a second diode which are connected in series between the third DC voltage source and said power supply node, the second diode being connected so that a forward current flows through it from the third voltage source to said power supply node; - a measurement terminal , connected to an intermediate node between the second resistor and the second diode. - a power supply node , intended to be connected to a first conduction electrode of the power switch to be characterized; - a power supply circuit ; the power supply circuit comprising: - a first DC voltage source generating a first power supply potential; - a first diode connected in series between the first DC voltage source and said power supply node, and connected so that a forward current flows through it from the first voltage source to said power supply node; - a second DC voltage source generating a second power supply potential greater than the first power supply potential; - a first resistor connected in series between the second DC voltage source and said power supply node ; - a first DC voltage source generating a first power supply potential; - a first diode connected in series between the first DC voltage source and said power supply node, and connected so that a forward current flows through it from the first voltage source to said power supply node; - a second DC voltage source generating a second power supply potential greater than the first power supply potential; - a first resistor connected in series between the second DC voltage source and said power supply node ; - a voltage-clipping circuit comprising: - a third DC voltage source ; - a second resistor and a second diode which are connected in series between the third DC voltage source and said power supply node, the second diode being connected so that a forward current flows through it from the third voltage source to said power supply node; - a measurement terminal , connected to an intermediate node between the second resistor and the second diode. - a third DC voltage source ; - a second resistor and a second diode which are connected in series between the third DC voltage source and said power supply node, the second diode being connected so that a forward current flows through it from the third voltage source to said power supply node; - a measurement terminal , connected to an intermediate node between the second resistor and the second diode. <EOS>