Atec Agilent-8563E - Manual (Page 88)

ESG Family Signal Generators Performance Tests
21. Measuring Phase Noise and Residual FM (ESG-AP and ESG-DP Series Signal Generators)
Calibration Guide 4-39
Using an HP/Agilent 8663A Synthesizer
Figure 4-35 shows the results of the same DUT measured with a 8663A Synthesizer. In
this measurement, the DCFM method was also used to phase lock the DUT to the E5500
system. Again, this produces 60 Hz-related spikes as well as other spurs at 20 and
100 kHz. Notice that the phase noise above 10 kHz is also worse than with the
HP/Agilent 8644B. The DCFM method of testing phase noise with an HP/Agilent 8662/3
should not be used.
Figure 4-35