I am trying to calibrate ADE7763 by using a reference meter. But I am not sure what the CF_IB and CF_ref(IB) refer to on eqution(41)? Could anyone help me figure it out?
In equation 41, CF_IB is the CF frequency when the base current of I_b is being put through the ADE7763 meter. Then CF_ref(IB) is the CF frequency of the reference meter with I_b as the current going through it. Equation 41 is finding the error in the energy measurement between the ADE7763 meter and the reference meter with I_b as the current being measured by both.
It is helpful to read the section before it, "Calibrating and Energy Meter", Page 35 - 36, this gives some helpful background and then the example on Page 37 can be used to better understand the gain calibration.
Let me know if you have any more questions.
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