D. Tarach et G. Trenkler, HIGH-ACCURACY N-PORT IMPEDANCE MEASUREMENT BY MEANS OF MODULAR DIGITAL AC COMPENSATORS, IEEE transactions on instrumentation and measurement, 42(2), 1993, pp. 622-626
The automatic measuring arrangement described provides impedance measu
rement in the low frequency range with relative errors of only a few p
arts per million. In contrast to former publications, all components o
f the designed arrangement are of modular construction, which results
in a variable structure of the measuring arrangement and permits measu
rement of nearly any n-port device.