A system for detecting skin contact comprises a signal generator (9) for generating an electric trigger signal； a reference circuit (10) comprising a capacitance (CREF) and a resistance (RPREF) for generating a reference signal in dependence on the trigger signal； a probe (11) touchable by a skin for measuring a skin response signal in dependence on the trigger signal； and a comparator (4) for comparing the skin response signal with the reference signal. The capacitance (CREF) of the reference circuit (10) represents a lower bound of skin capacitance, and the resistance (RPREF) of the reference circuit represents an upper bound of skin resistance.
