I need to record Electrode Impedance values, not only on or off state. I would like to implement the DC-Lead-off algorithm and calculate the impedance from the output value. I'm doing this by the following registers:
This enabled lead off detection with DC-Lead-Off circuit and pull-up/down resistors on Channels 1,2,3. Now the differential voltage should correspond to the Impedance between two electrodes. The DC Offset will change. Therefore i calculate like given here: https://www.elektroniknet.de/elektronik/halbleiter/erkennen-von-kontaktfehlern-bei-ekg-geraeten-170157.html
R_in = (2*V_DC*R_Pullup) / (2*V_ref - V_DC)
Is this workflow correct? Is there another possibility to easily record the impedance value?