Apparatus for use in determining a characteristic of a cathode r

Details Apparatus for use in determining a characteristic of a cathode r Apparatus for use in determining a characteristic of a cathode r

1975-12-29

1977-05-03

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

250201, 250549, 315 10, G01R 31024

Patent

active

040217248

ABSTRACT:
Test apparatus for a cathode ray tube has optical elements disposed along two optical paths from the screen of a cathode ray tube to two photosensors. One optical path passes through a graticule which has a pattern of light transmissive and non-transmissive areas. The real image of a luminous spot on the screen is accurately positioned on a boundary between two of the areas of the graticule by deriving a control signal from a comparison of the photosensor outputs.

REFERENCES:
patent: 2799825 (1957-07-01), Hardy
patent: 3188477 (1965-06-01), Ault

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