  In-circuit impedance measurement provides useful information for many EMC
applications. The inductive coupling approach is a promising in-circuit
impedance measurement method due to its non-contact characteristics and simple
on-site implementation. Many measurement setups of this approach were reported.
However, a comprehensive survey and comparison of these setups have not been
found in the literature. This paper reviews these setups in terms of their
characteristics, limitations, and applications. In addition, recommendations
for future research are also presented.
