Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-04-15
1978-05-02
Olms, Douglas W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57SS, 324 60R, H04B 346
Patent
active
040876578
ABSTRACT:
Equipment and methods are disclosed for testing inductively loaded telephone lines for loading irregularities. In brief, immittance phase measurements are used to determine the approximate frequencies of the poles and zeros of such a line and then a lossless ladder network comprising series inductors and shunt capacitors is synthesized wherein the pole and zero frequencies of the network are substantially equal to those previously determined. The network inductor values relate to the line loading inductor values while the network capacitor values relate to the distances between the loading inductors.
REFERENCES:
patent: 3711771 (1973-01-01), Hume et al.
patent: 3904839 (1975-09-01), Peoples
Brochure on Model T195 by Wilcom Products, Inc.
Introduction to Modern Network Synthesis, by Van Valkenburg, 1960, pp. 126-131.
Bell Telephone Laboratories Incorporated
Logan H. L.
Olms Douglas W.
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