TESTER FOR LIFE OF TRAVELLING-WAVE TUBE

摘要

PURPOSE:To read the tendency to the deterioration in a travelling wave tube quickly by measuring the time to the start of the sharp increase in spiral current and the start of the sharp drop in cathode current after a heater voltage of a travelling-wave tube to be measured is cut off at a desired time. CONSTITUTION:When a heater power source cutting signal is outputted from a controller 1, a microprocessor 14 turns off a switch 23 and a multiplexer 18 is switched over to the position of a cathode current detection resistance 16 and the position of a spiral resistance detection 19 to obtain data of the cathode current and the spiral current through an analog-digital converter 21. Based on the data, time th and tk are measured covering to the passing of the spiral current and the cathode current over the predetermined value after the turning off of the switch 23 with the controller 1. The times tend to be shorter after covering about 1,000hr. Thus, the tendency to the deterioration in the travelling-wave tube 2 can be detected quickly.