The Keysight 83651B is a dedicated source optimized for use with Keysight/Agilent 8510 systems. It combines the high performance and accuracy of a synthesized source with the speed and versatility of a sweep oscillator. The Keysight 83651B provides broadband frequency coverage (45MHz to 50GHz) and precise 1Hz frequency resolution. This source does not have modulation capabilities or a front panel keyboard and display. The 83651B comes with a rear-panel output.