By the expression electromagnetic compatibility measurements it is here specifically meant measurements aimed at assessing compliance of a device, equipment or system to an electromagnetic compatibility requirement. In this sense electromagnetic compatibility (EMC) measurements are compliance measurements. The scope of this chapter is to introduce the reader to the fundamental measuring instrumentation and measurement methods, defined by the International Electrotechnical Commission (IEC), for compliance assessment of commercial products. The essential metrological requirements specified for the EMC measuring instrumentation and test sites are also recalled and the relevant methods of verification of such requirements are briefly described.