In an earlier thread, there was a suggestion when measuring very small currents, to use "active shielding":
"For MOhm measurements - leakage currents will have possible effects here and the Eval-ADuCM350EBZ board is not optimised for this range. Suggest using active shielding (at VBIAS) to limit leakage on current carrying signals (T node and N Node)."
Can you expand on this? What exactly are you suggesting should be added to the ADuCM350 eval board?