Measurements and Results
R&S
®
FSW
213User Manual 1173.9411.02 ─ 43
Measurement principle
The bandwidth containing 99% of the signal power is to be determined, for example.
The algorithm first calculates the total power of all displayed points of the trace. In the
next step, the points from the right edge of the trace are summed up until 0.5 % of the
total power is reached. Auxiliary marker 1 is positioned at the corresponding frequency.
Then the points from the left edge of the trace are summed up until 0.5 % of the power
is reached. Auxiliary marker 2 is positioned at this point. 99 % of the power is now
between the two markers. The distance between the two frequency markers is the
occupied bandwidth which is displayed in the marker field.
OBW within defined search limits - multicarrier OBW measurement in one sweep
The occupied bandwidth of the signal can also be determined within defined search
limits instead of for the entire signal. Thus, only a single sweep is required to determine
the OBW for a multicarrier signal. To do so, search limits are defined for an individual
carrier and the OBW measurement is restricted to the frequency range contained
within those limits. Then the search limits are adapted for the next carrier and the OBW
is automatically recalculated for the new range.
For step-by-step instructions, see
"How to determine the OBW for a multicarrier signal
using search limits" on page 217.
Prerequisites
To ensure correct power measurement, especially for noise signals, and to obtain the
correct occupied bandwidth, the following prerequisites and settings are necessary:
●
Only the signal to be measured is displayed in the window, or search limits are
defined to include only one (carrier) signal. An additional signal would falsify the
measurement.
Occupied Bandwidth Measurement (OBW)
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