H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/2, 324/58.4
H04M 3/08 (2006.01) G01R 31/08 (2006.01) H04M 3/30 (2006.01)
Patent
CA 1182934
ABSTRACT OF THE DISCLOSURE The test device is based on the detection of the current in a two-wire line, such as a telephone loop, and enables to remote locate a short circuit or analogous. The invention deals with sensing the current at a predetermined line emplacement -upon adding simple switch means- also to control switching of the line, such as a working line, with another two-wire line, such as a spare line, or to select one of two loads terminating the line. The test device is inserted in series-connection on one of the line wires. Its ohmic value is constant in a low current range when the in-line current is less than a predetermined current value, and increases sharply to a higher ohmic value in a high current range when the in-line current is greater than the predetermined current value. Preferably the test device comprises a relay having an operate coil and a resting contact which are series-connected between the terminals of the test device, and a resistor parallel-connected with said contact.
400919
Daniel Michel
Prigent Hubert
Roudeau Maurice
Daniel Michel
Marks & Clerk
Prigent Hubert
Roudeau Maurice
LandOfFree
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