Cathode ray oscilloscope with a dual control knob assembly for e

Details Cathode ray oscilloscope with a dual control knob assembly for e Cathode ray oscilloscope with a dual control knob assembly for e

1983-04-15

1985-10-01

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

G01R 1322

Patent

active

045448850

ABSTRACT:
A cathode ray oscilloscope having a vertical or signal amplifier connected between a signal input terminal and a cathode ray tube for amplifying an input signal to be observed or measured. Upon disconnection of the vertical amplifier from the input terminal the cathode ray tube exhibits on its screen a bright horizontal line representative of a zero signal level. For the easy adjustment or setting of this zero signal level there is provided a one-hand-operable dual control knob assembly typically in the form of a concentric arrangement of first and second knobs. The first knob is to be pushed for activating a zero level switch, thereby to disconnect the vertical amplifier from the signal input. Sleeved upon the first knob, the second knob is to be turned for operating a potentiometric vertical position adjuster thereby to cause the bright line to move up and down on the cathode ray tube screen. The manipulation of only the first knob results in the appearance of the bright line on the screen, thus making possible the ready reconfirmation of the zero signal level.

REFERENCES:
patent: 3312925 (1967-04-01), Frantz
patent: 4363018 (1982-12-01), Matsui et al.
patent: 4398170 (1983-08-01), Nishikawa
patent: 4420663 (1983-12-01), Larson et al.
Tektronix General Products Catalog, 1980, p. 79.
IBM Technical Disclosure Bulletin, Kuntzelman, H., "Keyboard Transducer," May 1965, p. 1170.

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