A practical approach to electrode-skin impedance unbalance measurement

E. SPINELLI; M. MAYOSKY

IEEE TRANSACTIONS ON BIO-MEDICAL ENGINEERING

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Año: 2006 vol. 53 p. 1451 - 1453

0018-9294

Unbalance between electrode-skin impedances is a major problem in biopotential recordings, leading to increased power-line interference. This paper proposes a simple, direct method to measure that unbalance at power-line frequency (50–60 Hz), thus allowing the determination of actual recording conditions for biopotential amplifiers. The method is useful in research, amplifier testing, electrode design and teaching purposes. It has been experimentally validated by using both phantom impedances and real electrode-skin impedances.