So I was reading through this document: http://www.ti.com/lit/an/slua450/slua450.pdf (Theory and Implementation of Impedance track algorithm) and on the description for figure 2 on the bottom of the 2nd page it says, "After the 30 minute relaxation period has passed, the dV/dt < 4microV/s condition is checked. Once it is satisfied, OCV readings are taken."
I am wondering why this dV/dt condition needs to be satisfied to take the OCV reading. I feel like maybe it's obvious and I am just not understanding or there is some math behind it which I can't quite figure out. Either way, any help is appreciated.
Thanks!