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What is Total Harmonic Distortion (THD)?

April 26, 2017distortion Harmonic THD total

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What is Total Harmonic Distortion (THD)?

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A measure of the degree to which the input current is distorted from a sine wave, measured as a percentage. THD is usually expressed as a percentage of the fundamental frequency line current. THD for 4-foot electromagnetic fluorescent ballasts range from 20% to 40%. For compact fluorescent ballasts, THD levels greater than 50% are common. Good electronic ballast have less than 10% THD.