Connections to the body for electrocardiography (ECG) and electroencephalography (EEG)
Chapter 28, Problem 46(choose chapter or problem)
Connections to the body for electrocardiography (ECG) and electroencephalography (EEG) are normally made with metal electrodes and conductive gels to ensure good electrical contact. An alternative is the capacitively coupled noncontact electrode, which uses a conductor near but not contacting the skin, to form a capacitor. Clothing can serve as the capacitors insulation, eliminating skin contact. A particular EEG instrument calls for capacitive electrodes with maximum reactance at a typical EEG beta wave frequency of 25 Hz. Whats the minimum electrode capacitance?
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