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The Keysight 83651B 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. The Keysight 83651B provides broadband frequency coverage (45 MHz to 50 GHz) and precise 1 Hz frequency resolution. This source does not have modulation capabilities or a front panel keyboard and display. The Keysight 83651B comes with a rear panel output.