Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1975-01-20
1976-07-20
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324 295, 340249, G01R 1916, G01N 2746
Patent
active
039709337
ABSTRACT:
A device for testing the voltage of a voltage source comprises a bridge circuit, a differential switching circuit and an indicator element. The bridge circuit includes a first circuit comprising a first resistor; a second circuit comprising first diode means connected to the first circuit; a third circuit comprising a second resistor connected to the first circuit, the junction between the third and first circuits being connected to one terminal of the voltage source; and a fourth circuit comprising a serial connection of second diode means and a third resistor. One end of the fourth circuit is connected to the third circuit and the other end is connected to the second circuit. The junction between the fourth and second circuits is connected to the other terminal of the voltage source. The third resistor has a resistance value sufficiently great so that the differential voltage between the junction between the first and second circuits and the junction between the third and fourth circuits depends on the source voltage. The differential switching circuit is adapted to change its condition in accordance with the differential voltage between the junction between the first and second circuits and the junction between the third and fourth circuits. The switching circuit has a terminal for outputting the condition thereof. The indicator element is connected to the output terminal to indicate the condition of the differential switching circuit.
REFERENCES:
patent: 2482980 (1949-09-01), Kallmann
patent: 2922104 (1960-01-01), Godshalk et al.
patent: 3068410 (1962-12-01), Galman
patent: 3118137 (1964-01-01), Vincent
patent: 3204193 (1965-08-01), Rhyne
patent: 3256475 (1966-06-01), Kelly
patent: 3263170 (1966-07-01), Schneider
patent: 3452347 (1969-06-01), Stimson
patent: 3789242 (1974-01-01), Cantor
Hamaguchi Ichiro
Toyoda Kenji
Nippon Kogaku K.K.
Strecker Gerard R.
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