The R&S ZVB4 from Rohde & Schwarz is a Vector Network Analyzer with Frequency 300 kHz to 4 GHz, IF Bandwidth 1 Hz to 500 kHz, Output Power typ. -45 dBm to 15 dBm, Power Sweep Range >50 dB, Dynamic Range typ. 100 dB to 130 dB. Tags: Vector Network Analyzer. More details for R&S ZVB4 can be seen below.