Conformance tests on mobile phones call for utmost RF accuracy. ETSI test specification ETR028 [1], for example, deals with the subject of “uncertainties in the measurement of mobile-radio equipment”. In conformance test systems a reasonable compromise has to be found between measurement uncertainty, costs, automation and test time. This article shows, by way of example, how measurement uncertainties in conformance test systems from Rohde & Schwarz can be determined.
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