I have a question about the phase calibration of ADE78xx.
In the application note, the calibration is recommended to be performed with PF=0.5.
Why is it the best to perform the calibration with PF=0.5?
Hi Mr. K,
Phase calibration should be performed at a PF = 0.5 because at 0.5 there will be a comparably large active and reactive energy present. The phase calibration is done by measuring the reactive and active energy, calculating the error from the expected and then converting it to a phase error. This means that a large active and reactive energy reading is beneficial, this is accomplished at a PF = 0.5.
In the end it isn't so important that it be exactly PF = 0.5, just that it be near it and the actual PF be known accurately. A PF near 0 or 1 can't be used because the active or reactive energy respectively will be very small and therefore gives a source of error in the phase error measurement.
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