Connecting a potentiometer at the input leads of the AD8232 I was able to see the LOD+ signal toggling hi when the resistance was above 3 Mohm. Knowing the 0.7V comparator threshold from the datasheet, I have estimated the current that is internally generated at 100kHz to be ~200nA in amplitude.
I would like to obtain the continuous impedance response at the interface not just the binary LOD signal.
Is there an easy way to externally demodulate the 100kHz signal that is internally generated for the AC leads off detection?
I have tried to use an instrumentation amplifier externally but I wasn't able to detect the 100kHz signal.