Impedance measurement in operating conditions for PLC applications
Résumé
The influence of the electromagnetic environmentof the indoor power line grid (Houses’ Power Grid) isincreasingly important on the Power Line Communicationtransmission. The household equipment operating changesconsiderably the network impedance. Several procedures exist toevaluate the network impedance. Two impedance measurementtechniques seem to be the most adequate and allow tocharacterize loads under their operating conditions. The first oneuses current injection and reception probes and the second oneuses capacitive coupling. With a proper pre-measurementcalibration process, the proposed methods allow to measure theevolution of the impedance versus frequency of the active loads(TV screen, Fluorescent lamp…). This study deals with theanalyses of these two methods in order to evaluate theiradvantages and disadvantages. The measurements are carried innarrowband and broadband in the frequency range of 10 kHz to100 MHz.