Conformity Magazine - March 2009 - (Page 34) Damped Oscillatory Wave Specifications The most important parameters for the damped oscillatory wave are the rise time, oscillation frequency, decay, burst duration and burst period. For slow and fast waves, these are as in Figure 5. Damped oscillatory waves from IEC 610004-18 Edition 1 are the same as those in ANSI C37.90 except that the ANSI standard requires only the 1 MHz impulse. Figure 6: Common mode impulses Figure 4: Damped oscillatory wave impulse and burst SLOW WAVE Voltage rise time (T1 in Figure 1) Voltage oscillation frequencies Repetition rate: Decay: 75 ns ± 20 %; 100 kHz and 1 MHz ± 10 %; 40/s for 100 kHz and 400/s for 1 MHz ± 10 %; Pk5 must be > 50 % of the Pk1 value and Pk10 must be 50 % of the Pk1 value and Pk10 must be < 50% of the Pk1 value; 50 ms ± 20% 15 ms ± 20% 5 ms ± 20% 300 ms ± 20 % 3MHz < 330ns 10MHz < 100ns 30MHz 25 % of the Pk1 value and Pk10 must be < 25% of the Pk1 value Burst duration: FAST WAVE Voltage rise time Voltage oscillation frequencies, Repetition rate Decay : Figure 7: Differential mode impulses Burst duration : 3 MHz 10 MHz 30 MHz Burst period: FAST WAVE short circuit: Current rise time Current oscillation frequencies Decay Figure 5: Primary specifications 3 Conformity marCh 2009 Figure 8: Calibration curve for 0.1 Ω measurement shunt
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