Our contribution deals with the human skin voltage chart measurement. The human skin has a certain impedance or resistance - it can be easily described and simulated using a substitute electric circuit. But the skin also contains parts with measurably lower impedance and different electric properties – we can show them clearly by measurement of voltage chart. We have concentrated our effort on finding and following the measurement of active points on certain part of the skin's surface, to acknowledge their existence and positions through a measuring process. The parameters of the measured voltage chart are influenced by the amplitude, frequency and the shape of the measuring electric signal. We focused our research effort in this paper to measure the frequency influence and then the influence of the shape of the driving signal.