Foreign potential checker

Details Foreign potential checker Foreign potential checker

1976-01-22

1977-02-01

Olms, Douglas W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 62, H04B 346

Patent

active

040063194

ABSTRACT:
The disclosure relates to a monitoring system and method for determining the magnitude of the equivalent voltage source impedance and the magnitude of the equivalent voltage source voltage on a telephone line and switching network of a telephone system. The monitoring system measures the Thevenin source voltage and source impedance to ground on the line by applying two independent voltage conditions to the line and senses the resulting steady state voltages thereby produced in a sensing resistor. The magnitudes of the sensed steady state voltage are thereafter utilized for obtaining the Thevenin source voltage and source impedance magnitudes.

REFERENCES:
patent: 3711661 (1973-01-01), Garrett et al.
patent: 3731189 (1973-05-01), Sharaf et al.
patent: 3821641 (1974-06-01), Portoulas

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