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Maximum DC offset for bio-potentials

Question asked by JKK on Jan 23, 2012
Latest reply on Jan 24, 2012 by Matt.Duff



I wonder if anyone knows of good reference material relating to maximum expected DC offset for bio-potentials. Webster recommends +/-300mV but +/-500mV is mentioned by Bill C in a discussion a while ago and some designs go well over +/-1V (see MS-2178). Typical measured values with large surface area electrodes tend to be much lower than these maximum values so it can be hard to justify the design effort that goes into an amplifier which can tolerate these levels of offset.