Information

EMI Pre-Compliance Guide RIGOL Technologies
RIGOL Technologies CO., LTD. 09.09.2021
Documentation
In the EMI mode of RSA5000N / RSA3000N series, the measurements can be stored in
different ways. For example, the complete signal trace can be stored as a * .csv file or a test
report including settings, limits , an image of the graph including meter result and the signal
table can be created as HTML or *.pdf in the analyzer itself or on an external USB stick. It is
possible to modify the header of the test report with information like temperature /
humidity, name of operator or test location, etc.
The next part of this document will go through some measurement examples with conducted
/ radiated emissions and near field probing.
Conducted Emission
As already mentioned, conducted emission is mainly measured up to 30 MHz at lines (e.g.
power, analog / digital signals, etc.). For conducted emission test on power line it is necessary
to supply the DUT with power. At the same time the disturbances from DUT shall be
measured. The problematic is, that also from the power supply disturbances could be send
out which shall not be measured. Another aspect is the impedance matching to avoid a wrong
result based on an impedance mismatch. The solution for this problematic is the usage of a
line impedance stabilization network [LISN]. A LISN blocks all interferences (via inductive
component) from power supply to SA, but supplies a DUT with power. Depending on
inductive size, a LISN can be used for DC (5 µH) or AC (50 µH) power source. The power will
Figure 4: Zoom View of a Peak Signal