Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1983-03-08
1986-03-04
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
307262, 324133, 328148, 340662, 340663, G08B 2100
Patent
active
045742766
ABSTRACT:
An indicating system includes first and second voltage comparators, first and second output circuits which are respectively supplied with output signals of the first and second voltage comparators, and first and second indicating elements which are connected to a common output terminal of the first and second output circuits. A first input terminal of the first voltage comparator is supplied with a first reference voltage, and a second input terminal thereof is supplied with a control signal. A first input terminal of the second voltage comparator is supplied with a second reference voltage, and a second input terminal thereof supplied with the control signal. When the voltage level of the control signal is higher than the first reference voltage, the first output circuit causes a current of a first polarity to flow to the common output terminal. As a result, the first indicating element is lit up, and the second indicating element is not. When the voltage level of the control signal is lower than the second reference voltage, the second output circuit causes a current of a second polarity to flow to the common output terminal. As a result, the second indicating element is lit up, and the first indicating element is not. When the voltage level of the control signal is intermediate between the first and second reference voltages, neither of the first and second indicating elements are lit up.
REFERENCES:
patent: 3663958 (1972-05-01), Crane
patent: 4318092 (1982-03-01), Cowles et al.
"Polarity Indicator"; Elektor (English), vol. 2, No. 7-8, Jul.-Aug. 1976, p. 715.
"In-Circuit dc Current Measurement"; Electronics Industry, vol. 2, No. 11, Dec. 1976, p. 15.
Hitachi , Ltd.
Myer Daniel
Rowland James L.
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