Impedance balancing analysis for power-line interference elimination in ECG signal

This paper describes an analysis of skin-electrode impedance balance for power-line interference elimination from ECG signal. This work is based on previous authors and conducted in three steps: The first step consists analysis of impedance balancing system. The second one is to examine the measurement system of power-line interference elimination using a physical model. And finally, we use the previous condition for checking of power-line interference elimination validity in real ECG signal recording. Result has shown that skill-electrode impedance balance can be achieved by using an impedance controller so that interference can be eliminated to very low value. In other word, to reduce skin-electrode unbalance that skin abrasion is unnecessary. Thus, this work is improvement method of previous authors and it is very important for safety in measurement system of biopotential signals.