Voltage Fluctuation and Flicker Testing (IEC 61000-3-3)
Voltage fluctuation testing measures the variations your product causes in the supply voltage. Compatible Electronics provides IEC 61000-3-3 testing to ensure your products don't cause visible light flicker from connected lighting.
What is Voltage Flicker Testing?
Voltage fluctuations caused by rapidly varying loads can make lights flicker, which is annoying and can cause health issues for sensitive individuals. IEC 61000-3-3 sets limits on voltage changes, voltage fluctuations, and flicker to prevent these problems.
Key Parameters Measured
Voltage Change Parameters
- dc - Voltage change (steady-state, percentage)
- dmax - Maximum voltage change (percentage)
- d(t) - Relative voltage change characteristic
Flicker Severity
- Pst - Short-term flicker severity (10 minutes)
- Plt - Long-term flicker severity (2 hours)
Standards We Test To
IEC / EN Standards
- IEC 61000-3-3 (all editions including AMD2)
- EN 61000-3-3 - European Harmonized Standard
- KS C 9610-3-3 - Korea Standard
- National variations
Applicability
Equipment with Rated Current ≤16A Per Phase
Single-Phase Equipment
Connected to Public Low-Voltage Supply
Not Subject to Conditional Connection
Limits
Pst
≤ 1.0
Short-term flicker severity
Plt
≤ 0.65
Long-term flicker severity
dc
≤ 3.3%
Steady-state voltage change
dmax
≤ 4%
Maximum voltage change
Products Typically Requiring Testing
Motor-Driven Appliances with Variable Loads
Heating Equipment with Thermostatic Control
Refrigerators & Compressor-Based Equipment
Welding Equipment (Consumer Grade)
Large Household Appliances
Test Duration
⏱️
Pst Measurement
10-minute observation period
🕐
Plt Measurement
2-hour observation period (12 consecutive Pst values)
📊
dc and dmax
Additional measurement time
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