What is the difference between Vector Network Analyzer (VNA) and impedance analyzer

The Vector Network analyzer measures the scattering parameters between the ports in a multi-port network. These could be changed to impedance parameters but will include transfer impedances as well as the input port impedances. An impedance analyzer on the other hand emphasizes the accurate measurement of complex impedance between a pair of terminals. The transfer impedance between the ports is not included in this measurement.

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