Vertical amplifier apparatus with a beam-finding function for an

Details Vertical amplifier apparatus with a beam-finding function for an Vertical amplifier apparatus with a beam-finding function for an

1991-10-16

1992-08-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2972

Patent

active

051382393

ABSTRACT:
A vertical amplifier apparatus with a beam-finding function for an oscilloscope including an analog multiplier and a gain control circuit. The analog multiplier multiplies an input signal to the vertical amplifier by a gain control signal. The gain control circuit outputs a DC voltage as the gain control signal. In a beam-finding mode, the gain control circuit supplies the analog multiplier with the gain control signal whose absolute value is much smaller than that of the gain control signal in a normal mode. This makes is possible to obviate a dedicated beam-finder circuit. In a multi-channel oscilloscope, the beam-finding operation can be performed independently for each channel.

REFERENCES:
patent: 3689752 (1972-09-01), Gilbert
patent: 3949317 (1976-04-01), Crosby
patent: 4224556 (1980-09-01), Muto
patent: 4677340 (1987-06-01), Miller et al.

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