Atec Rohde-Schwarz-FSL3-FSL6 - Manual (Page 13)

Spectrum Analyzer ¸FSL 13
Burst power measurement: time domain power
This feature allows the burst power to be measured in the time
domain. Display lines delimit the evaluation area, thus making
it possible to determine the power during the 147 useful bits of
a GSM burst, for example.
Occupied Bandwidth (OBW)
OBW is a measure of the bandwidth occupied by the signal.
The ¸FSL determines this value from the total power within
the span and the individual external power values, for example
0.5% of the power. The remaining value then corresponds to
99% of the bandwidth. The fully synchronous frequency sweep
and the high number of trace points make this measurement
very precise.