The R&S ZNB4 from Rohde & Schwarz is a 50 Ohm, vector network analyzer that operates from 9 kHz to 4.5 GHz. It has a dynamic range of 122 dB, a directivity of 35 dB and harmonics of -20 dBc. It takes less than 5 ms for measurement and has 5 ms of switching time between channels. The R&S ZNB4 is ideal for commercial, military, aerospace applications and has a large 12.1" touch screen interface which makes it easy to control and review test results. This VNA is available with 2/4 Ports and has N type female connectors. Other interface options are GPIB, LAN and a USB port.