Description:

Flicker measurements assess the effects of continuous voltage fluctuations, reflecting the unstable perceptual effects caused by time-varying light stimulation on human visual perception.

Test standard basis: IEC 61000-3-3/GB 17625.2 Electromagnetic compatibility-Limits-Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current greater than 16A.

IEC standards specify: de does not exceed 3%; dd with a duration exceeding 3% is less than 200ms; dmax does not exceed 4%.

Voltage flicker: There are two main indicators used to assess flicker in power systems. Short-term flicker, Pst, and long-term flicker, Plt.

Short Term Flicker Perceptibility (Pst) is the measure over a short period (within 10 minutes) of how irritating flicker is thought to be and uses Pst=1 as the threshold for flicker perception. Pst simulates the flicker sensation produced by a 60W incandescent lamp operating on a 230V AC voltage in a 50Hz power grid under voltage fluctuation conditions.

Long Term Flicker Perceptibility (Plt) is a further measure for cumulative irritation over a longer period (within 2 hours), and the standard uses PLt=0.65 as the threshold for flicker perception.

Scope of Application:

Electronics and electrical products.

Applicable Countries and Standards:

Image of Testing Equipment: