PURPOSE: A performance diagnostic monitor of magnetron is provided to simultaneously perform dynamic state measurement and the performance assessment of a magnetron oscillator. CONSTITUTION: A driving power measuring unit includes a voltage measuring unit and a current measuring unit. The driving power measuring unit measures the voltage of the drive power and current and the flow-in voltage and the flow-in current flowed in to magnetron. The magnetron oscillator measuring unit comprises an orientation combining unit and an electromagnetic wave measuring unit. The directional coupler distributes the electromagnetic wave emitted from the magnetron oscillator. The electromagnetic wave measuring device measures the graded partial electromagnetic wave.
