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.
For more information on an impedance analyzer and to fulfill any requirement of the same in Singapore, you can get in touch with Hioki. We have all types of analyzers, battery testers and earth testers to fulfill the requirement of the tests that are crucial for the safety of humans and equipment being used.