I am trying to calibrate ADE7953.
I tried voltage transformer first with the vp and vn inputs, the readings of Vrms register were linear, and I got satisfactory results.
but when I used voltage network instead of Voltage transformer, I found that Vrms values are not linear!
at input 226 volts ----> Vrms = 7086792
at input 112 volts ----> Vrms = 4682430
at input 57 volts ----> Vrms = 1691471
the results are stange, and I could not get a valid V/lsb constant, because it seems that the results are not consistent.
kindly find the attached schematic for our voltage network.
(note: the jumper in the schematic is for selection between VT and Voltage network )
I do not understand, where is the problem??