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IEC 60060-1 Waveform Tolerance Checker
Enter the measured front time T1 and tail time T2 of a recorded lightning impulse. The tool validates against the IEC 60060-1 standard envelope, including the 2025 revision for Um > 800 kV.
Time to reach peak from 30%
Time to half value
Highest system voltage; matters for > 800 kV
Reference — IEC 60060-1 tolerance envelope
LI: T1 nominal 1.2 µs ±30% (0.84 – 1.56 µs); T2 nominal 50 µs ±20% (40 – 60 µs).
LI with Um > 800 kV (2025 revision): T1 front-time positive tolerance extends to +100% (i.e. 0.84 – 2.4 µs).
SI: T1 nominal 250 µs ±20%; T2 nominal 2,500 µs ±60%.
LI: T1 nominal 1.2 µs ±30% (0.84 – 1.56 µs); T2 nominal 50 µs ±20% (40 – 60 µs).
LI with Um > 800 kV (2025 revision): T1 front-time positive tolerance extends to +100% (i.e. 0.84 – 2.4 µs).
SI: T1 nominal 250 µs ±20%; T2 nominal 2,500 µs ±60%.