Ground path testing

Details Ground path testing Ground path testing

1997-06-23

1999-08-03

Ballato, Josie

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

340649, 379 26, G01R 3102

Patent

active

059330112

ABSTRACT:
A method and device for testing the quality of a ground path, particularly although not exclusively for a telecommunications system. The device has terminals for connection to respective lines, such as tip and ring. A terminal is provided for connection to the local ground. Voltage-sensitive switches of increasing threshold voltage are alternatively connected between the local ground and each of the tip and ring lines via a rotary or other selector switch and the terminals. Current will flow if the local ground potential exceeds the threshold voltage of the voltage sensitive switches. A device responsive to mains frequency, e.g. a butt-in head set, provides an audible sound (mains hum) indicating the ground potential rise exceeds the threshold of the selected voltage-sensitive switch.

REFERENCES:
patent: 1421702 (1922-07-01), McCurdy
patent: 4051333 (1977-09-01), Schomburg
patent: 4197435 (1980-04-01), Jackson et al.
patent: 4638245 (1987-01-01), MacPhee et al.
patent: 4691337 (1987-09-01), Held-Elbert et al.
patent: 5218616 (1993-06-01), Stephens
patent: 5436953 (1995-07-01), Nilson

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