Specifications

70 Chapter 9
Measuring Digital Communications Signals
Making Burst Power Measurements
Measuring Digital Communications
Signals
NOTE If you set the burst width manually to be wider than the screen’s
display, the vertical white lines move off the edges of the screen. This
could give misleading results as only the data on the screen can be
measured.
NOTE The Bluetooth standard states that power measurements should be
taken over at least 20% to 80% of the duration of the burst.
Step 9. Increase the sweep time to display more than one burst at a time:
Press
Sweep, Sweep Time, 6200, µs (or 6.2, ms).
The screen display shows several bursts in a single sweep as in
Figure 9-2. The burst power measurement measures the mean power of
the first burst, indicated by the vertical white lines.
Figure 9-2 Setting Burst Width (Left) Displaying Multiple Bursts (Right)
NOTE Although the burst power measurement still runs correctly when
several bursts are displayed simultaneously, the timing accuracy of the
measurement is degraded. For the best results (including the best
trade-off between measurement variations and averaging time), it is
recommended that the measurement be performed on a single burst.