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Applications
EMI Testing
Measuring Conducted EMI
Emissions
2706 RF Preselector
This chapter briefly describes several applications that can benefit from using the
Preselector.
These include:
H Electromagnetic interference (EMI) testing
H Susceptibility testing
H Benchtop analysis
In each case, you can use the Preselector manually or remotely (with a controller
connected to the IEEE-488 GPIB interface).
The Preselector can increase the accuracy of your EMI compliance tests for
standards such as:
H FCC regulations (USA)
H CENELEC regulations (EC)
H VDE regulations (Germany)
H CISPR (International)
H VCCI standards (Japan)
H MIL-STD-461/462
The Preselector can help your spectrum analyzer measure EMI conducted out of
a device by attenuating strong signals outside the band of interest.
Use a Line Impedance Stabilization Network (LISN) for conducted emissions
tests.
CAUTION. To avoid damage to the spectrum analyzer, always use a transient
limiter with the LISN. Connect the transient limiter between the LISN and the
Preselector. The Preselector alone cannot protect the spectrum analyzer from
power surges.
A LISN provides a known source impedance for the connected power line and
provides access to the RF signals of the device under test.
4–1
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