Patent ID: 7501846

Claim:
A measurement apparatus that measures a current consumed by an electronic device, comprising: a power supply output terminal connected to the electronic device; a power supply voltage output section that outputs a power supply voltage; a diode switch section having two diodes connected in parallel between the power supply output terminal and the power supply voltage output section so as to rectify in the direction opposed to each other that applies between the power supply output terminal and the power supply voltage output section a current consumed by the electronic device when the electronic device is in operation; a rest time drive section that provides the current consumed by the electronic device to the power supply output terminal so as to keep a voltage of the power supply output terminal the same as the power supply voltage when the electronic device is in resting state, said rest time drive section comprising a voltage follower circuit comprising an operational amplifier to which the power supply voltage output from the power supply voltage output section is input; and a switch disposed between an output end of the voltage follower circuit and the power supply output terminal that closes when the electronic device is in resting state, and opens when the electronic device is in operation; and a rest time current measurement section that measures an output current value of the rest time drive section.