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Phase Shifting for EM Calibration

I am trying to design a 3phase energy meter with MSP430.

I need to calibrate it and I have a phantom load with range of 0-100A and auto transformer for 0-220VAC .

How can I adjust the phase angle / PF  so as to calibrate the circuit at UPF and 0.8 lag & 0.5 lead ?

 

Guidance is appreciated

 

Deepak

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