Ade7758 calibration vrms

Hi

I am working on ade7758 .

I can read and write in registers and i have no problem .i can read all of the default value correctly.

I can get vrms value but it is not calibration.

I get offset value for vrms and set in register.i turn it into real value but i have a problem

When

Vref=220>>>>vade=220

But ehen

Vref=25>>>>vade=23

I dont know why!!!can you help me

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