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304 Chapter5
One-Button Measurement Functions
MEASURE (Spectrum Analysis Mode)
One-Button Measurement Functions
5.1.4 Occupied BW
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.
For more information see
“Meas Setup (Occupied Bandwidth—OBW)” on page 451.
The occupied bandwidth function also indicates the difference between the analyzer center
frequency and the center frequency of the channel, referred to as “Transmit Freq Error.”
The 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, press
Meas Setup after selecting Occupied BW.Pressing
Radio Standard after Mode Setup has been selected will access all the Radio Standards
available for which this measurement can be applied. Pressing
Meas Control enables you to
pause or restart a measurement, or toggle between continuous and single measurement.
Key Path:
MEASURE
Remote Command:
Remote Command Notes: The results for both values are returned in Hz.
Example: FETC:OBW? or MEAS:OBW? or READ:OBW? command returns scalar
results of occupied bandwidth and transmit frequency error.
FETC:OBW:OBW? or MEAS:OBW:FERR? or READ:OBW:FERR? commands
Measurement Results Available
Command Results Returned
:CONFigure:OBW
:INITiate:OBW
Not Applicable
:FETCh:OBW?
:MEASure:OBW?
:READ:OBW?
Returns two values that correspond to the Occupied BW and
Transmit Frequency Error in Hertz.
:FETCh:OBW:OBWidth?
:MEASure:OBW:OBWidth?
:READ:OBW:OBWidth?
Returns a single value that corresponds to the Occupied BW in
Hertz.
:FETCh:OBW:FERRor?:MEASu
re:OBW:FERRor?
:READ:OBW:FERRor?
Returns a single value that corresponds to the Transmit
Frequency Error in Hertz.
:FETCh:OBW:XDB?
:MEASure:OBW:XDB?
:READ:OBW:XDB?
Returns a single value that corresponds to the x dB BW in
Hertz.