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sci.harmonic-distortion-THD Calculator
Calculates total harmonic distortion THD = √(V₂²+V₃²+...)/ V₁ from harmonic voltage or current amplitudes and overall signal quality. THD < 5% is the IEEE 519 limit for industrial power systems — variable frequency drives and switch-mode power supplies are major harmonic sources.
Inputs
V1 V
Reference formula or conversion factor shown for context.
V3 V
Reference formula or conversion factor shown for context.
V5 V
Reference formula or conversion factor shown for context.
V7 V
Reference formula or conversion factor shown for context.
V9 V
Reference formula or conversion factor shown for context.
Results
THD voltage (%)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
true RMS voltage (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
crest factor
A dimensionless multiplier applied in the calculation.
harmonic RMS (excl. fundamental)
Sample size or count used in the calculation.
THD = √(ΣVh²)/V1 × 100%
Reference formula or conversion factor shown for context.
IEEE 519 limit
Reference formula or conversion factor shown for context.