Telephone line testing instrument having a supervising capabilit

Details Telephone line testing instrument having a supervising capabilit Telephone line testing instrument having a supervising capabilit

1973-05-04

1976-03-02

Olms, Douglas W.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179175, 307237, H04B 346

Patent

active

039419509

ABSTRACT:
A movable telephone circuit test instrument is provided, indicators mounted thereon which show the communicating state of a telephone circuit being tested. Supervision of the circuit under test is thus provided at the same location as the tester, thereby reducing the number of persons required to carry out the test. The supervising indicating means are preferably light emitting diodes and are provided in a unique driving circuit that includes a variable conductance parallel current path for maintaining the brightness of the light emitting diode substantially constant regardless of the magnitude of current being monitored by the supervising circuits.

REFERENCES:
patent: 2666099 (1954-01-01), Bonner
patent: 3143604 (1964-08-01), Cochran et al.
patent: 3600678 (1971-08-01), Garrett
patent: 3601560 (1971-08-01), Garrett
patent: 3627932 (1971-12-01), Garrett
patent: 3711661 (1973-01-01), Garrett et al.
patent: 3729597 (1973-04-01), Garrett et al.
patent: 3736386 (1973-05-01), Everton

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