Making The Measurement - Agilent Technologies E5500A User Manual

Making the
Measurement
Document Part No. E5500-90024Ed. 1.0
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 will be very close to 0 Hz.
Searching for the beatnote will require 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 Figure 5-31.
If incrementing the frequency of one of the sources does not produce
a beatnote, you will need to verify the presence of an output signal
from each source before proceeding.
Figure 5-31 Oscilloscope Display of a Beatnote out of the Agilent 70420A
Monitor Port
1
Click the Continue button when you have completed the beatnote
check and are ready to make the measurement.
2
When the PLL Suppression Curve dialog box appears, select View
Measured Loop Suppression, View Smoothed Loop
Suppression, and View Adjusted Loop Suppression. See
Figure 5-32.
E5500 Phase Noise Measurement System Version A.02.00
Expanding Your Measurement Experience
Testing the Agilent 8644B Internal/External 10 MHz
5
5-39