H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 9/00 (2006.01) G01R 31/44 (2006.01) G08B 29/10 (2006.01)
Patent
CA 2170008
A self-diagnostic circuit for an emergency lamphead is disclosed that is effective during standby operation of the lamphead to indicate whether the lamphead is capable of operating in an emergency mode. The self-diagnostic circuit includes a high-impedance circuit path connected in series with the lamphead and including an indicator, such as an LED, which is energized by a battery current passing through the circuit path and lamphead during the standby mode operation. The battery current is insufficient to illuminate the lamphead, but is sufficient to energize the LED whenever proper electrical continuity exists through the lamphead. A second high-impedance circuit path may be connected in parallel with the lamphead, in order to energize a second LED when proper continuity does not through the lamphead. The self-diagnostic circuit may be incorporated into each of a plurality of remote lampheads in a multiple-lamphead system, and may include a bipolar transistor or FET for isolating the self-diagnostic circuits of the lampheads from each other.
Feldstein Robert S.
Vosika David A.
Finlayson & Singlehurst
Hubbell Incorporated
LandOfFree
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