Information

EMI Pre-Compliance Guide RIGOL Technologies
RIGOL Technologies CO., LTD. 09.09.2021
Figure 6: Physical connections for conducted emission EMC testing
The ground connection of LISN (and DUT if possible) needs to be connected to the horizontal
ground plane.
In the example below the conducted emission test was performed on a power supply (Phase)
of a test device using a 50µH AC LISN
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. First test was performed with integrated LISN limiter
and the second test in figure 7 was performed without limiter. The limit lines and detectors
are selected for standard EN55022, Class B. The test result is including correction values of
LISN. This test uses two limit lines. First one is for average detector and second (blue) limit
line is for QP detector. For information only, the peak detector was also activated for final
measurement, because the peak detector displays always the worst case value. This power
supply is very close below the limit margin, but it passed. Higher peaks can be analyzed via
measure meter.
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TEKBOX TBLC08