256 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz
14 Measure (Spectrum Analysis Mode)
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.
Figure 6 Burst Power Measurement
The mean carrier power is calculated by:
converting each trace point amplitude from dBm into linear power
adding the above amplitudes together and dividing by the number of points included in
the average.
This value is then displayed in logarithmic form (dBm).
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