Tektronix WCA200A, User Manual

Page: 233 / 454

Time Analysis (Time Mode)
WCA230A & WCA280A User Manual
3- 107
Figure 3--75 shows an example of the phase noise measurement. The Integrated
Phase Noise in the measurement results indicates a phase noise value obtained
by integrating C/N in the random jitter measurement range illustrated in
Figure 3--74. The Random Jitter in the measurement results indicates a jitter
value equivalent to the integrated phase noise.
Spectrum
C/N versus Offset frequency
Measurement results
G
Carrier frequency
G
Channel power
G
Integrated phase noise
G
Random Jitter
G
Maximum periodic jitter
Current trace (green)
Averaged trace by the
Median filter (yellow)
Figure 3- 75: Phase noise measurement
Selecting Trace 2.
In the C/N versus Offset frequency graph, Trace 1 (yellow)
represents a trace averaged by the Median filter and Trace 2 (green) represents a
Max-Min waveform by default. You can change Trace 2 using the Trace/Avg
menu.
To change Trace 2, press the TRACE/AVG key and set the following items:
Trace 2...
Selects Trace 2.
H
Max-Min. Default. Shows the maximum and minimum C/N values at
alternate frequency points; its advantage is its resemblance to an analog
display.
H
Reference.
When loaded as Trace 2, displays the waveform as the reference,
which has been saved using Save Trace 1 .
H
Off.
Displays no waveform.