LIFE DETECTING DEVICE OF MAGNETRON

PROBLEM TO BE SOLVED: To provide a portable life detecting device of magnetron which detects the life of magnetron as early as possible. SOLUTION: The life detecting device of magnetron is composed of: a moding detecting means including an antenna 41 which receives microwave power output by the magnetron and a filter 42 which shuts off the microwave power of normal oscillation of magnetron input from the antenna 41, and makes the microwave power of abnormal oscillation of magnetron pass through and outputs it according to the passed microwave power; and a signal processing means including a detection/rectification circuit 44 which detects and rectifies the output of the filter 42 to make it into direct current, a comparison circuit 45 which compares a commutating signal output by the detection/rectification circuit 44 with a reference signal and, when a predetermined comparison result is obtained, outputs a comparison signal, and an alarm display circuit 47 which displays an alarm in response to the comparison signal output by the comparison circuit 45. COPYRIGHT: (C)2011,JPO&INPIT