The N9048B from Keysight Technologies is a RF Spectrum Analyzer with Frequency 1 Hz to 44 GHz, Frequency Resolution 1 Hz to 8 MHz, Analysis Bandwidth 40 MHz, Real Time Bandwidth 350 MHz, Video Bandwidth 1 Hz to 3 MHz, 4, 5, 6, 8, 50 MHz. Tags: Analyzer with Screen, PXI. More details for N9048B can be seen below.