Input voltage waveform distortion

A numerical indicator representing the accuracy (quality) of commercial power. Normally, commercial power is a sine wave, but voltage distortion can occur due to the addition of high-frequency components caused by noise from surges and other sources. In electrical and electronic devices that require highly accurate input voltage, significant distortion may prevent proper operation, so care is needed. One countermeasure is to insert a noise filter designed to handle voltage waveform distortion.