Method for accurate measurement of transmission line impedance b

Details Method for accurate measurement of transmission line impedance b Method for accurate measurement of transmission line impedance b

1990-02-16

1991-11-05

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324533, 324525, 364482, 36457102, G01R 3108

Patent

active

050633538

ABSTRACT:
A method for measuring the impedance of a transmission line. The length and D.C. loop resistance of the line are measured. A pulse is transmitted along the line, the pulse having a duration greater than the time required for it to propogate from its source to the end of the transmission line and reflect back to the source. The transmitted and reflected pulses are monitored and the resultant readings converted to a gross impedance measurement. The measurement is then corrected for the "dribble up" effect. The magnitude of the correction is a function of D.C. loop resistance of the line. The corrected measurement is an accurate measurement of line impedance.

REFERENCES:
patent: 3500204 (1970-03-01), Stromer
patent: 4087658 (1978-05-01), Hoppough
patent: 4870532 (1989-09-01), Beatty, Jr. et al.
Western Electric Technical Digest No. 14, Apr. 1969, Circuit for Remote Measurement of the Absolute Value of an Impedance or Admittance, Marvin et al.

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