Chapter 3 91
Mode
Occupied Bandwidth Measurement
Mode
Occupied Bandwidth Measurement
To configure measurement settings, select Occupied BW and then press Meas Setup.
Pressing
Control/Sweep enables you to pause or restart a measurement, or toggle between
continuous and single measurement, refer to “Control/Sweep” on page 98.
Occupied BW—OBW Measurement Description
Occupied Bandwidth integrates the power of the displayed spectrum and puts markers at
the frequencies between which a selected percentage of the power is contained. The
measurement defaults to 99% of the occupied bandwidth power. The power-bandwidth
routine first computes the combined power of all signal responses contained in the trace.
For 99% occupied power bandwidth, markers are placed at the frequencies on either side of
99% of the power. 1% of the power is evenly distributed outside the markers. The
difference between the marker frequencies is the 99% power bandwidth and is the value
displayed.
The occupied bandwidth measurement can be made in single or continuous sweep mode.
The center frequency, reference level, and channel spacing must be set by the user.
To configure measurement settings, select
Occupied BW and then press Meas Setup.
Pressing
Control/Sweep allows you to restart a measurement, refer to “Control/Sweep” on
page 98.
Remote Measurement Results
To query the results of the measurement, the desired measurement has to be configured,
initiated and then the measurement results can be queried using the CALCulate:DATA?
command.
If you execute the remote command CALCulate:DATA? when the Occupied Bandwidth
(OBW) measurement is active, the query will return 6 comma-separated scalar results in
the following order:
Mode Spectrum Analyzer
Remote Command :CONFigure:OBWidth
Example CONF:OBW
Remote Command
Notes
You must be in the Spectrum Analyzer mode to use this command.
Use INSTrument:SELect SA to set the mode.
Key Path
Meas, Occupied BW
Result # Field Name Description
1 Time Stamp Seconds Time of measurement, instrument clock
in seconds
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