76 Chapter 2
One-Button Measurement Functions
MEASURE (Spectrum Analysis Mode)
One-Button Measurement Functions
2.2.10 Burst Power The burst power measurement is an accurate method of determining the average power for
the specified burst. Burst power measures the average power in zero-span mode for the
captured burst. This measurement is primarily for use with time domain modulated
signals (Bluetooth™, GSM /Edge, and NADC). The burst width, if not user defined, is
determined by finding the peak in the captured data, then searching for the first place that
the trace is higher than the threshold level. This is considered to be the start of the burst.
The stop of the burst is the first position in the trace that falls below the threshold level.
The mean carrier power is calculated based on the burst width and the threshold level.
Refer to the following figure for clarification of these parameters.
The burst power measurement acquires data from the “Measured Area” above when a
radio standard is chosen and when Meas Setup, Meas Method, Measured Burst Width is selected.
When Meas Setup, Meas Method, Above Threshold Lvl is selected, the “Measured Area” extends
the burst width delimiter lines to the start and stop points.
The mean carrier power is calculated by:
1. converting each trace point amplitude from dBm into linear power
2. Adding the above amplitudes together and dividing by the number of points included in
the average.
3. This value is then displayed in logarithmic form (dBm).