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SIGLENT
SDS2000X User Manual 177
Current Harmonics
Switching power supplies draw a range of harmonics from the AC mains.
Standard limits are set for the power of the harmonics that travel back to the power
distribution grid. These reflected harmonics can cause problems with other devices on the
grid.
Use the current harmonics analysis to perform the pre-compliance test of IEC61000-3-2
(Class A, B, C (no support) or D) standard. The analysis presents up to 40 harmonics for a
given input signal.
1. Press the Utility button on the front panel to enter the UTILITY function menu.
2. Press the Next Page softkey to enter the second page of the UTILITY function menu.
3. Press the Power Analyze softkey to enter the ANALYSIS function menu.
4. Press the Analysis softkey, and then turn the universal knob to select Harmonics
and press down the knob to confirm.
Figure 104: ANALYSIS Function Menu
5. Connect probes to the device-under-test and to the oscilloscope as well.
a. Connect the current probe to the live wire of the AC input with the direction of the
arrow pointing towards the current flow.
b. Connect the voltage and current probes to the desired oscilloscope channels.
6. Press the Signal softkey to enter the SIGNAL menu.
Figure 105: Harmonics SINGAL Menu
7. Press the Voltage and Current softkeys and then turn the universal knob to select the
channels.
8. Press the Cycles softkey, and then turn the universal knob in order to set the number
of cycles on the screen’s display.
9. Press the Auto Setup softkey to automatically set the appropriate time/div and volt/div
for the measurement.
10. Press the return button to return to the ANALYSIS function menu.
11. Press the Settings softkey to enter the SETTINGS menu.
Figure 106: Harmonics SETTING Menu
12. Press the Line Freq softkey, and then turn the universal knob to select the
appropriate line frequency 50Hz, 60Hz or 400Hz.
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