Designed for engineers characterizing and evaluating passive electronic components and semiconductor devices, Agilent E4990A features frequency range of 20 Hz to 10/20/30/50/120 MHz and 0.045% basic accuracy, while E4991B offers frequency range of 1–500 MHz or 1 GHz/3 GHz and basic accuracy of 0.65%. E4991B additionally provides material measurement options that include temperature characteristics analysis from -55 to 150°C and direct read function of permittivity and permeability.
This story is related to the following:Impedance Analyzers