Arrangement for checking and indicating the malfunction of a lam

Details Arrangement for checking and indicating the malfunction of a lam Arrangement for checking and indicating the malfunction of a lam

1987-03-20

1989-02-28

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

250551, 324501, H08B 2100

Patent

active

048089753

ABSTRACT:
An arrangement for monitoring malfunctioning display lamps in control, switching, safety and indicator systems, wherein the display lamp, which is provided with a series resistor, is connected in parallel with the series connection of a visual indicator and an electronic circuit and this parallel connection is controlled in dependence on the operating state of the display lamp.

REFERENCES:
patent: 3237099 (1966-02-01), Troll
patent: 3883777 (1975-05-01), Morita
patent: 3984765 (1976-10-01), Rocci, Jr.
patent: 4025845 (1977-05-01), Lhommelet
"Burned-Out Pilot-Lamp Indicators", R. L. Ives; Electronics World, Jun. 1963, p. 40, vol. 69 #6.
"Inexpensive Remote Light Indicator Uses IC Timer", Sarpangal; Electronic Engineering, Mar. 1977, vol. 49 #589.

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