Specifications

72 Chapter 9
Measuring Digital Communications Signals
Making Statistical Power Measurements (CCDF)
Measuring Digital Communications
Signals
Figure 9-3 Power Stat CCDF Measurement on a W-CDMA Signal
Step 5. Store your current measurement trace for future reference:
Press
Display, Store Ref Trace.
When the power stat CCDF measurement is first made, the graphical
display should show a signal typical of pure noise. This is labelled
Gaussian, and is shown in aqua. Your CCDF measurement is displayed
as a yellow plot. You have stored this measurement’s plot to make for
easy comparison with subsequent measurements.
Step 6. Display the stored trace:
Press
Display, Ref Trace (On).
The stored trace from your last measurement is displayed as a magenta
plot (as shown in Figure 9-4), and allows direct comparison with your
current measurement.
Figure 9-4 Storing and Displaying a Power Stat CCDF Measurement