I am using ADE7878 for 3Phase Energy meter purpose. I have calibrated 3voltage channels. Now, i need to calibrate current channels.
Actually I am using 400/1A Current transformer. 1A CT output is given to the 0.3 Ohm resistor to get 0.3V(rms) output. This 0.3V is given to ADE7878 Current channel ADC inputs through filter circuits.
If I calculate the Gain using the formula given in AP1076, Gain register value is exceeding the register value.
I am taking the RMSref value as 4000000.(400A)
RMSref/RMS = 400000/3785635 = 1.056626
Gain = 1.056626-1=0.056626
Gain in Hex = 1073F85 (Decimal - 17252229)
The above value is exceeding the xIGAIN register value.
Please tel me how to solve this.
Waiting for your reply.