AMETEK CTS 3.0 - Manual (Page 72)

Compliance Test System 3.0 User Manual
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5.3.1 Class D Special Current Waveshape
If you elected to test to the IEC 61000-3-2:1998
standard, a unit is considered to be class D
equipment if it meets the power consumption
limits listed above and its current waveform
matches at least 95 % of a specified wave
shape template. This template is aimed at
„capturing‟ high crest factor loads that are known
to generate high harmonic currents. The wave
shape template consists of three time domain
sections, one for each 1/3 period of the signal
during a positive or negative half-cycle of the
input voltage. The center section is normalized
to, and centered around the peak current value.
The other two sections have a 0.35 times Ipeak
amplitude limit. The actual template is shown in
Figure 5-1.
½
0.35
0
0
1
i
i
pk
M
3 3 3
Figure 5-1: Class D Current Wave Shape
Template