16.3.2 Waveform SCC (Surge)
The current transformer is necessary to verify the SCC waveform. It will be connected with pos.6
and pos.7. Then the outgoing BNC output creates the connection to the oscilloscope. The SCC
gets displayed on the oscilloscope and can be compared with the parameter as shown in the
operation menu from the AXOS
8
. It represents the signal in accordance to the IEC 61000-4-4.
The same test procedure gets applied for L, N, PE output at the front view.
Significant: Do not connect the “EUT Supply Input” with external power supply at the rear view,
when using the current transformer. It can be directly purchased through the HAEFELY AG or
contact your sales representative.
Figure 16-2: Current transformer
16.3.3 Electrical fast transient/Burst
The HAEFELY EFT Verification Kit includes a 50 Ω and 1000 Ω attenuator as required in the IEC
61000-4-4 standard. The appropriate attenuator is fitted to the “Burst” coaxial output, and an
oscilloscope is then connected to the output of the attenuator. For measuring the waveform at the
output of the coupling filter, single phase and three phase adapters are available. NOTE: Be sure
to disconnect mains power from the “EUT Supply Input” before connecting the measuring
attenuators. Measuring attenuators are designed for burst voltages only and will be destroyed if
subjected to AC/DC voltage.
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