Spectrum Analyzer 9kHz-1.8GHz, with option: 041 = HPIB Interface Frequency range: 9 kHz to 1.8 GHz; The HP (now Keysight) 8590 L-Series spectrum analyzers offer a wide range of performance, features, and prices designed to fit your budget. Choose from low-cost, basic performance analyzers or from higher-performance models. Whatever your choice, you'll find 8590 L-series spectrum analyzers easy to use and reliable. Their expandable feature sets allow them to be easily configured to meet your growing measurement needs.