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Refer to
familiar with the relationship between the PLL capture range and the peak
tuning range of the VCO.)
If the center frequencies of the sources are not close enough to create a beatnote within
NO T E
the capture range, the system is not able to complete its measurement.
The beatnote frequency is set by the relative frequency difference between the
two sources. If you have two very accurate sources set at the same frequency,
the resulting beatnote is very close to 0 Hz.
Searching for the beatnote requires that you adjust the center frequency of one
of the sources above and below the frequency of the other source until the
beatnote appears on the oscilloscope's display. See
If incrementing the frequency of one of the sources does not produce a
beatnote, you need to verify the presence of an output signal from each source
before proceeding.
0 V
E5505a_oscillo_disp_beatnote
25 Feb 04 rev 1
Figure 57 Oscilloscope display of beatnote from test set monitor port
Agilent E5505A User's Guide
Chapter
14, "Evaluating Your Measurement Results" if you are not
-1V/div
Expanding Your Measurement Experience
Figure
57.
4
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