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ADE9153A how to demo autocalibration function ?

Dear ,

        I checked the arduino code for ADE9153A.below link.

But I don't know how to use this code to demo autocalibration funciton.

       when connect to power, the output power data is correct.

after press autocalibration button to finish  autocalibration.The output power data is same.

       So would you let me know how to demo this autocalibration function ?

How does this autocalibration function work?