Phasor impedance measuring test set

Details Phasor impedance measuring test set Phasor impedance measuring test set

1981-04-08

1983-09-13

Chin, Gary

Boots, shoes, and leggings

324 57R, 324 62, G01R 2700

Patent

active

044046367

ABSTRACT:
Test set apparatus for measuring the phasor impedance of a circuit under test, such as a telephone line. The test set apparatus also calculates for display the return loss of a circuit under test, against predetermined values of resistance or certain RC networks.
To measure phasor impedance, the test set apparatus includes a signal generator providing a measurement frequency signal to a constant current source having an individual battery power source. The current source is connectable to measurement terminals, which provide for connection of a circuit under test, and produces measurement current flow through the circuit under test. During an impedance measurement, the battery-powered current source is connected to the measurement terminals and isolated from ground, thereby permitting operation of the test set apparatus to measure the impedance to a balanced circuit in the presence of externally-induced longitudinal voltages.

REFERENCES:
patent: 3284705 (1966-11-01), Dobson
patent: 3624496 (1971-11-01), Feinstein
patent: 3678379 (1972-07-01), Arvay et al.
patent: 3786349 (1974-01-01), Devenyi
patent: 3904859 (1975-09-01), Poncelet
patent: 3986108 (1976-10-01), Thomas
patent: 4013949 (1977-03-01), Ice
patent: 4196475 (1980-04-01), Hall
Telephone Engineer & Management, "The ABC's of . . . Cable Fault Locating".
Cable Analyzer by Micro Computer Systems, Inc., Greensboro, N.C.

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