On the project, MCU manages two ADE7953 ICs that provide 4 current channels. I set to use line cycle accumulation mode to measure the active energy and apparent energy. To calibrate the meters, accurate voltage and current source are used. I have a question on Wh/LSB calculation during active energy calibration:
On AN-1118 Application Note, page 11, on section "Establishing the Wh/LSB constant", it mentioned that it is for the first meter only. I wonder what does "first meter only" mean. I think Wh/LSB must be calculated using accurate current source (set source to provide constant watts and read AENERGYA value) and MCU firmware used this value to calculate the active energy (Wh/LSB * AENERGYx) when line cycle accumulation mode IRQ triggered, is it right? Usually I provides the calibration program for the production to calibrate the boards. But Wh/LSB calculation should not be part of the calibration program, is it right? On Figure 8 (Active Energy Calibration Flow -Registers), what the action "Set Wh/LSB" is to do, calculating Wh/LSB or something else?
Thank you very much for the help!