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7
Absolute Measurement Examples
Microwave Source
Capture
Range
Capture
Range
7-78
E5500 Phase Noise Measurement System Version A.02.00
Figure 7-52 Oscilloscope Display of a Beatnote out of the Agilent 70420A
Monitor Port
Estimate the system's capture range (using the VCO source
parameters entered for this measurement). The estimated VCO
tuning constant must be accurate within a factor of 2. A
procedure for Estimating the Tuning Constant is located in this
chapter.
VCO
Tuning
Constant
= = = =
(
Hz
)
= = = =
(
Hz
)
NOTE: If you are able to locate the beatnote, but it distorts and then
disappears as you adjust it towards 0 Hz, your sources are injection
locking to each other. Set the beatnote to the lowest frequency
possible before injection locking occurs and then refer to Minimizing
Injection Locking in the Problem Solving section of this chapter for
recommended actions.
(Hz/V)
X
Tuning
Range
5
(Hz/V)
X
(V)
5
Document Part No. E5500-90024 Ed. 1.0
(V)
= = = =
________(
Hz
)
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