K-factor relates the heating effect of a distorted current in a transformer to a sinusoidal current with the same RMS magnitude — it describes a transformer’s ability to serve non-linear loads without exceeding rated temperature rise limits.

**updated equation. Fixed. Applies to PM8xxx and PM55xx**
The K-factor is equal to the sum of the squares of the harmonic currents multiplied by the squares of the harmonic order. The meter uses the following equation to calculate K-factor:Where K is the K-factor, h is the harmonic order and Ih is the true RMS current of harmonic order h.

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