Test circuit for electrical continuity of a load circuit

Details Test circuit for electrical continuity of a load circuit Test circuit for electrical continuity of a load circuit

1981-12-14

1984-05-08

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340643, 340 80, G08B 2100

Patent

active

044478062

ABSTRACT:
A test circuit is disclosed for testing the continuity of a load circuit, such as a vehicle lamp circuit, and indicating a discontinuity when the load circuit is either energized or de-energized. The test circuit comprises an indicating circuit with an LED and a switching transistor in series and a voltage divider for biasing the transistor to a conductive state. The detecting circuit includes a reed switch which is closed in response to load current for connecting a point on the voltage divider to ground to switch the transistor off. The detecting circuit also includes current blocking means such as a diode for connecting the voltage divider to ground through the load circuit so that the transistor is switched off when there is continuity in the load circuit to ground.

REFERENCES:
patent: 3643247 (1972-02-01), Ratcliffe
patent: 3644886 (1972-02-01), Sabaroff
patent: 3995262 (1976-11-01), France et al.
patent: 4222047 (1980-09-01), Finnegan
patent: 4401972 (1983-08-01), Lupoli

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