Abstract

Isolation in bioelectric recordings is not only of importance for the electrical safety of the patient, but is often supposed to be also beneficial for the suppression of interference. In this paper, the influence of isolation on the reduction of interference is treated. Its effect appears to depend on the isolation capacitance. Interference caused by the capacitances between the input cables and the interference source is not influenced by isolation. An often overlooked source of interference is the voltage across the isolation barrier. The feedthrough of this signal to the output is specified by the isolation mode rejection ratio (IMRR). Measures to reduce this type of interference are discussed.

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