Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-06-16
1981-12-22
Robinson, Thomas A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57SS, H04B 346
Patent
active
043072674
ABSTRACT:
Apparatus and method (FIG. 1) for testing inductively loaded telephone transmission lines for immittance irregularities approximate a ladder network of series inductors and shunt capacitors equivalent to the input impedance of the transmission line from the pole and zero frequencies of the differential phase versus frequency characteristic thereof. The differential phase function is obtained (FIGS. 5 and 6 combined or FIGS. 5 and 7 combined) as the Hilbert transform of the logarithmic difference between a direct and delayed impedance measurement extending over a swept-frequency range in the voice-frequency band. Inductance values of the ladder network are proportional to the inductances of the line loads and the capacitor values are proportional to the distances between load inductors spaced along a transmission line.
REFERENCES:
patent: 3751606 (1973-08-01), Kaiser, Jr.
patent: 3904839 (1975-09-01), Peoples
patent: 4087656 (1978-05-01), Blum et al.
patent: 4087657 (1978-05-01), Peoples
patent: 4087658 (1978-05-01), Hoppough
patent: 4229626 (1980-10-01), Peoples
"Introduction to Modern Network Synthesis", Van Valkenburg, John Wiley & Sons 1960, pp. 128-131.
Bell Telephone Laboratories Incorporated
Kearns Joseph P.
Robinson Thomas A.
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