For conducted emissions testing, a LISN (line
impedance stabilization network) is required. A
LISN is used for two main reasons. Firstly, it is
used to filter any noise from the mains power
that is fed to the DUT. Secondly, it filters RF
noise from the DUT that would normally be
coupled to the mains power and passes it to the
spectrum analyzer.
A limiter is also usually used to attenuate the
signal input to the spectrum analyzer to safe
levels.
> EMI Test[F1] and choose a
frequency band to test at. The test frequency
that is chosen determines whether the test is a
radiated or conducted test, based on what
standard you wish to use.
2. Press Amb.Noise Reject[F1] to turn on ambient
noise rejection. This function will essentially set
the RBW to 9kHz and lower the noise floor for
bandwidths between 30MHz and 3GHz. This
will allow an open environment to emulate an
anechoic chamber.
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