Method and apparatus for measuring cathode emission slump

Details Method and apparatus for measuring cathode emission slump Method and apparatus for measuring cathode emission slump

G - Physics

01

R

324/2, 316/3

G01R 31/24 (2006.01) G01R 31/25 (2006.01)

Patent

CA 1103303

METHOD AND APPARATUS FOR MEASURING CATHODE EMISSION SLUMP Abstract A cathode ray tube, having a cathode and first, second and third grid electrodes, is biased "on" to allow an electron current Ik to flow from the cathode to the second and third grid electrodes. During a test period of predetermined length, the peak value of cathode current is stored as a reference measurement Ikp and the cathode current Ik is continuously monitored and compared with Ikp. A failure indication is provided if the magnitude of Ikp - Ik exceeds a predetermined value at any time during the test period.

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