Electricity: measuring and testing – Electric lamp or discharge device – Cathode-ray tube
Patent
1981-05-04
1984-02-21
Tokar, Michael J.
Electricity: measuring and testing
Electric lamp or discharge device
Cathode-ray tube
313477HC, G01R 31024
Patent
active
044332920
ABSTRACT:
A color tube so arranged as to check the operation of an electron gun reserved for a particular type of visual display such as a red warning signal and therefore not normally employed for independent operation. The arrangements contemplated preferably include direct checking for continuity of the corresponding filament circuit by means of a separate output lead from said filament, as well as checking of the emission of the reserved-gun cathode by inserting an additional anode which is intended to form a diode with said cathode. Testing by means of the additional external connections thus formed can take place by detection of current flow.
REFERENCES:
patent: 3623135 (1971-11-01), Doggett et al.
patent: 4066311 (1978-01-01), Poulson
"Thomson-CSF"
Tokar Michael J.
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