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

1977-03-28

1978-07-18

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 20R, G01R 31024

Patent

active

041018230

ABSTRACT:
A cathode ray tube having a cathode and first, second and third grid electrodes, is biased "on" to allow an electron current I.sub.K 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 I.sub.kp and the cathode current I.sub.k is continuously monitored and compared with I.sub.kp. A failure indication is provided if the magnitude of I.sub.kp - I.sub.k exceeds a predetermined value at any time during the test period.

REFERENCES:
patent: 3878455 (1975-04-01), Ochmann
William Kelvin, Modern Picture-Tube Testers, Radio-Electronics, vol. 12, Dec. 1960, pp. 59-62.

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