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What is active shielding?

Question asked by amf on Dec 3, 2015
Latest reply on Dec 4, 2015 by LiamR

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?