ADE9078 Calibration

The process of calibration can be broken down to applying a known current and voltage then finding the transfer function for the meter versus the expected transfer function. Take your input current and translate it to the voltage at the input of the ADC. Then do the same with your voltage. From there based on the full-scale values of the ADE9000 you can understand what the expected A/code and V/code of each channel are. Now read back the xRMS registers to get your measured codes and using the xGAIN registers, apply the gain to get the expected codes.

There is nothing that stands out as problematic in you schematic and I have a feeling that this is purely a calibration issue based on how far off the measurements in your screenshot are. The GAIN being applied to each channel really shouldn't exceed +/-50% so that is usually a good indicator if something is going wrong in the calculation of the GAIN value.

The process of calibration can be broken down to applying a known current and voltage then finding the transfer function for the meter versus the expected transfer function. Take your input current and translate it to the voltage at the input of the ADC. Then do the same with your voltage. From there based on the full-scale values of the ADE9000 you can understand what the expected A/code and V/code of each channel are. Now read back the xRMS registers to get your measured codes and using the xGAIN registers, apply the gain to get the expected codes.

There is nothing that stands out as problematic in you schematic and I have a feeling that this is purely a calibration issue based on how far off the measurements in your screenshot are. The GAIN being applied to each channel really shouldn't exceed +/-50% so that is usually a good indicator if something is going wrong in the calculation of the GAIN value.

Thanks dlath for your time 


the process which I worked in Calibration:
1- I  used a Calibration tool for ADE9078  to calculate the Transfer function and again
2- I apply this value voltage is 241V and the nominal current is 0.36A  and I put these values in the excel sheet 

Q1- I want to ask is there a problem because I use less than 1 A to Calibration the current. 

Q2- I don't know how  Enter Meter Constant(impulses/kWHr) is Calculated and If it's true or not in my case.

3- I take the value of  the Transfer function from the sheet and put it in the code  

Serial.print("VA:");
Serial.print(((double)vltgRMSRegs.VoltageRMSReg_A/(0.001009082 * 52866837.00 * sqrt(2)))); //Print AVRMS register
Serial.print(" || CB: ");
Serial.println(((double)curntRMSRegs.CurrentRMSReg_B /(0.0164 * 52866837.00 * 1.414213)));)));

* The full code in the drive link with the Library  

drive.google.com/.../1g5wivGL_gWbV5zt1TCmWGK1X76WoJtjS

4- I upload the code I can Start reading these Values : 

5- then  I take These Values and put it the Calibration sheet to calculate the xGain  

6- I Write these values to ADE908 in the code

	SPI_Write_32(ADDR_AVGAIN,0xF990F992); 
	SPI_Write_32(ADDR_BIGAIN,0XF80A346F);

7- I read these values on the Serial monitor 

it's very close but the main problem was the value didn't change I increase to decree the current and voltage didn't change 

it's just a change between two  values  241VA, 0.38A, or Zero    when I remove all load, and sometimes it didn't change

Finally I solve the Problem , I made a mistake in the PCB desgin ...that I connect the VolReff to the Ground