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