Apparatus for applying particular voltages to three-terminal cir

Details Apparatus for applying particular voltages to three-terminal cir Apparatus for applying particular voltages to three-terminal cir

1976-06-28

1977-06-07

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

040285073

ABSTRACT:
Apparatus which may be used in the performance of at least six tests on a telephone subscriber's line is disclosed. The apparatus operates to force the tip and ring leads of a line to particular potential levels and then produces output voltages related to the currents flowing in the tip and ring leads. These output voltages may be processed to perform the following test: dc Thevenin, ac three-terminal admittance, ac foreign emf, percent imbalance, swept loaded loop and detection of unauthorized equipment. The apparatus may be used when performing tests on other three-terminal circuits.

REFERENCES:
patent: 2677102 (1954-04-01), Young
patent: 3411081 (1968-11-01), Schulz
patent: 3582774 (1971-06-01), Forgacs

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