Signal Generator / Synthesized Sweeper 45MHz - 20GHz Unit sold with a 90 day warranty The Agilent (now Keysight) 83621B is a dedicated source optimized for use with Keysight 8510 systems. It combines the high performance and accuracy of a synthesized source with the speed and versatility of a sweep oscillator. 83621B provides broadband frequency coverage (45 MHz to 20 GHz) and precise 1 Hz frequency resolution. This source does not have modulation capabilities or a front panel keyboard and display. 83621B comes with a rear panel output. Dedicated source for Keysight 8510 systems 1 Hz resolution Synthesized 45 MHz to 20 GHz coverage