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Figure 6-11
NOTE
Graph of Phase Lock Loop Bandwidth Provided by the Peak Tuning
Range
1. Once the beatnote is displayed, press the press [[RANGE ]] , press
[[AUTO RANGE OFF ]] , and press [[SINGLE AUTO RANGE ]] on
the RF analyzer.
2. Set the span width on the RF analyzer to approximately 4 x PLL
bandwidth. Adjust the beatnote to position it near the center of the
display.
If you are not able to tune the beatnote to 2 X PLL bandwidth (center of
display) due to frequency drift, refer to Tracking Frequency Drift in this
section for information about measuring drifting signals. If you are able to
locate the beatnote, but it distorts and then disappears as you adjust it
towards 0 Hz, then 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 this section for
recommended actions.
3. Press the [[ AVG ]] key, and then the RMS key. Wait for the trace to
return and then press [[ MKR ]] and MKR to Peak.
4. Press [[ REL MKR ]] , and MKR REF.
5. Press the [[ DEFINE TRACE ]]press the [[ and the MATH FUNCTION
keys.
Agilent Technologies E5500 Phase Noise Measurement System 6-21
Absolute Measurement Fundamentals
Evaluating Noise Above the Small Angle Line
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