Method and apparatus for automatic oscilloscope calibration

Details Method and apparatus for automatic oscilloscope calibration Method and apparatus for automatic oscilloscope calibration

1985-12-02

1987-11-03

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

315370, 313462, H01J 3126

Patent

active

047045582

ABSTRACT:
A beam detection apparatus for sensing the position of an electron beam within a cathode ray tube is disclosed. The apparatus includes a photodetector for optically detecting the intersections of the electron beam with a graticule line on the faceplate of the cathode ray tube. In a second embodiment, an electrically conductive pattern of reference markers is applied to the graticule for intercepting the beam and a detector is coupled to the conductive pattern for detecting the interception. Calibration circuitry is also included to generate input signals to deflection amplifiers coupled to the cathode ray tube and to evaluate detection signals generated by the beam coinciding with a graticule line. The calibration circuitry compares the input signals to the input signal value represented by the graticule line and adjusts the deflection amplifiers of the cathode ray tube accordingly to cause the beam to coincide with a graticule line bearing a predetermined relationship to the input signal deflecting the beam.

REFERENCES:
patent: 4159484 (1979-06-01), Strathman
patent: 4163250 (1979-07-01), Tomii et al.
patent: 4283655 (1981-08-01), Mossman et al.
patent: 4439735 (1984-03-01), Alvite et al.
patent: 4514756 (1985-04-01), Blank et al.

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