I'm using ADE7878A for implementing 3 phase Energy meter. In Datasheet of ADE7878A, there is a type of registers namely AVRMSOS, BVRMSOS and CVRMSOS for offset correction in RMS reading of Voltage(and a similar set of registers for current as well as for active power). Earlier i was just ignoring them all but recently i came to know that it is something which help to achieve accuracy over a large dynamic range.
But i'm not getting them properly. Can anyone help me in understanding how they can be used.