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Measure of Harmonics & Flickers

Measure of Harmonics & Flickers

The formal definition of "flicker" is the "impression of instability of the visual sensation induced by a light stimulus whose luminance or spectral distribution fluctuates over time".
The flicker can be considered as a symptom, deriving from the modulation of a load (the DUT) and the effects that this produces on its supply voltage. While the DUT is connected to a voltage source with a finite impedance, any modulation of the load will cause voltage fluctuations on the supply line.
The EN 61000-3-3 standard focuses mainly on the limitation of such fluctuations and consequent flicker on low-voltage public power systems. Voltage variations produced by electrical and electronic equipment when tested under the specified conditions must not exceed 4%.

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