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Impedance Measurement Waveforms

Question asked by larryvarn on Jul 5, 2017
Latest reply on Jul 19, 2017 by mark.ramos


I'm using the 2-wire example in the IAR studio as my starting point; using the switch mux config board for a 2-wire bioimpedance measurement.   I have installed 1 uF blocking caps on the input and output from the AFE to the electrodes.  My question - when i observe the waveforms using a scope, i see what appears to be an approximately 1V amplitude pulse of duration perhaps 10 ms, with the measurement sinusoid riding on it.   Is there any way to reduce or eliminate this pulse - since I'm planning to use this on a cardiac probe we don't want to introduce any sudden DC levels into the tissue (high-frequency sine waves are OK however).

When i check the program in the IAR studio, it seems to be set for DAC attenuation mode and about 12mV amplitude sine wave.