Current monitor circuits

Details Current monitor circuits Current monitor circuits

1975-01-07

1976-06-29

Caldwell, John W.

Communications: electrical

Systems

Call station

307311, 315135, 340248C, G08B 2100

Patent

active

039672573

ABSTRACT:
A visual indicator in parallel with a zener diode, positioned in series with a load is provided to monitor the presence of current flow in a circuit over a range of several orders of magnitude. In addition, a circuit arrangement is described to monitor the continuity and current flow in two separate parallel paths, feeding a common load in order to check the continuity of the circuitry and associated switching devices. For this purpose, a second current monitor, including a series switch, is placed in parallel with a first series arrangement of a current monitor and a switch. Alternate polarity arrangements of the respective zener diodes associated with the corresonding current monitors are illustrated to show the varing modes of operation contemplated by this invention.

REFERENCES:
patent: 3345536 (1967-10-01), Atkins et al.
patent: 3412392 (1968-11-01), Jenkins et al.
patent: 3423636 (1969-01-01), Rowley, Jr.
patent: 3639805 (1972-02-01), Muench et al.
patent: 3651378 (1972-03-01), McWilliams
patent: 3729656 (1973-04-01), Luquain
patent: 3767978 (1973-10-01), Wernli
patent: 3795821 (1974-03-01), Ichiyanagi
IBM Technical Disclosure Bulletin, Vol. 14, No. 5, Oct., 1971, p. 1368.

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