Test point mounted circuit condition indicator

Details Test point mounted circuit condition indicator Test point mounted circuit condition indicator

1979-02-14

1981-04-21

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324 51, 324120, 324122, 340654, G01R 1916, G01R 3102

Patent

active

042635500

ABSTRACT:
Indicating devices for mounting on a test point in an alternating current distribution system provide a visual indication of either voltage level or fault occurrence in the system. The indicating devices are contained in a housing which includes an electrically-conductive rubber outer shell adapted to snap-fit over the test point, and a non-conductive inner housing within which the indicating devices are contained. The indicating devices include a bridge-type rectifier which is coupled to a conductor of the system through the test point terminal, and to ground through the electrically-conductive outer shell. In a voltage indicator application, the rectifier circuit charges a capacitor across which a neon lamp visible through a window in the end of the housing is connected, the rate at which the neon lamp flashes providing an indication of the voltage level on the conductor. In a fault indicator application, the rectifier charges a capacitor which provides current for tripping an indicator flag to a fault-indicating position following a fault, and to a reset position upon restoration of alternating current in the system.

REFERENCES:
patent: 3390331 (1968-06-01), Brown et al.
patent: 3524133 (1970-08-01), Arndt
patent: 3524178 (1970-08-01), Stratton

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