Harmonic

Total harmonic distortion calculator

Total harmonic distortion calculator
  1. What is THD and how it is calculated?
  2. What is a good THD value?

What is THD and how it is calculated?

The total harmonic distortion (THD or THDi) is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency. Distortion factor, a closely related term, is sometimes used as a synonym.

What is a good THD value?

Measuring THD

For best results, the voltage THD should not exceed 5%, and the current THD should not exceed 20% of the fundamental frequency.

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