Electricity: measuring and testing – Testing potential in specific environment – Voltage probe
Patent
1988-11-21
1989-08-22
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Testing potential in specific environment
Voltage probe
324500, 324537, 324556, 324133, 340652, G01R 3102
Patent
active
048599328
ABSTRACT:
A multi-function tester (10) for testing electrical continuity and detecting the presence of various types of voltages comprises a bistable flip flop (14) having set and reset input terminals (2, 6) which are driven by voltage changes thereat to change the level of voltage appearing at an output terminal (3), with the set input terminal being coupled to a voltage source (12) through a set resistor (30) and being coupled to a common terminal (26) through a TMOS FET switch (16). An LED (32) is connected between the flip flop output terminal and the common terminal. A storage switch (18) couples and decouples the set and reset terminals. A voltage probe (20) coupled to the DC voltage source, a common probe (22), coupled to the common terminal, and a switch probe (24), coupled to a switching terminal (38) of the TMOS FET are used to place voltage signals on the switching terminal, both directly and through other circuits, for changing a switching impedance of the TMOS FET and thereby changing the voltage at the set and reset input terminals for changing the state of the flip flop and thereby activating and deactivating the LED.
REFERENCES:
patent: 3288929 (1966-11-01), Hutchinson
patent: 3290586 (1966-12-01), Anderson
patent: 3639833 (1972-02-01), Tachick
patent: 3831089 (1974-08-01), Pearce
patent: 4027236 (1977-05-01), Stewart
patent: 4207558 (1980-06-01), Kunzer
patent: 4321530 (1982-03-01), Kelly et al.
patent: 4410850 (1983-10-01), Pesto et al.
Eisenzopf Reinhard J.
Mueller Robert W.
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