Phase Noise Display - Tektronix SPECMON3 Manual

RF Measurements
Parameters Tab
The Parameters tab enables you to specify several parameters that control signal acquisition for the
CCDF Display.
Setting
Single
Total Time
Continuous
Span
xxx
Single
To have statistically meaningful results, CCDF works best when calculated on at least 1 ms of data.
Depending on the Analysis Time setting, the CCDF display may present error messages:
If the Actual Analysis Time is greater than 1 ms, the CCDF Display will calculate the trace without
any problems.
If the Actual Analysis time is less than 1 ms, the CCDF Display will measure the data as best if
can, but if it receives fewer than 20 samples, the CCDF display will clear the trace and report "Not
enough samples".

Phase Noise Display

Phase Noise measures and graphs the power in a 1 Hz bandwidth referenced to the carrier power. This is
repeated for many frequency points across a user-adjustable span.
To show the Phase Noise display:
182
Description
When Single is selected, the CCDF measurement is based on the Analysis Time
parameters set on Analysis control panel (Setup > Analysis > Analysis Time), shared by
all displays. In Single, CCDF is time-correlated with the other open displays.
When Total Time is selected, you can adjust its value. The value set here does not affect
the Analysis Length value set in the Analysis control panel. If the Total Time value is
longer than the Analysis Length, CCDF uses multiple acquisitions to collect signal data.
When Continuous is selected, the CCDF measurement combines each new record
(Actual Analysis Length) into the existing result. It does not erase and start over until
user presses STOP or CLEAR.
Specifies the range of frequencies used for analysis.
SPECMON3 & SPECMON6 Printable Help
Parameters Tab