3.5.2 THD

Due to the limit of the code size, THD is not provided directly by the metrology firmware, but you can get them by the following formulas:

Where:

I₁ is the amplitude of fundamental harmonic current
V₁ is the amplitude of fundamental harmonic voltage
I_rms is the all harmonics current RMS value
V_rms is the all harmonics voltage RMS value
I_{1 rms} is the fundamental harmonic current RMS value
V_{1 rms} is the fundamental harmonic voltage RMS value

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