  In-circuit impedance provides key information for many EMC applications. The
inductive coupling approach is a promising method for in-circuit impedance
measurement because its measurement setups have no direct electrical contact
with the energized system under test, thus greatly simplifying the on-site
implementation. This paper presents and summaries the latest research on the
inductive coupling approach and its EMC applications. First of all, three
common measurement setups for this approach and their respective pros and cons
are discussed. Subsequently, their EMC applications are introduced. Finally,
recommendations for future research are listed.
