Ronde & Schwarz 1304.0004.03, User Manual

Page: 155 / 1076

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
155 User Manual 1178.3370.02 ─ 09
7.2.6.2 OBW Results
As a result of the OBW measurement the occupied bandwidth ("Occ Bw") is indicated
in the marker results. Furthermore, the marker at the center frequency and the tempo-
rary markers are indicated.
The measurement is performed on the trace with marker 1. In order to evaluate
another trace, marker 1 must be placed on another trace (see
Assigning the Marker to
a Trace ).
The OBW calculation is repeated if the Search Limits are changed, without performing
a new sweep. Thus, the OBW for a multicarrier signal can be determined using only
one sweep.
Centroid frequency
The centroid frequency is defined as the point in the center of the occupied bandwidth,
calculated using the temporary OBW markers T1 and T2. This frequency is indicated
as a function result ("Occ Bw Centroid") in the marker table.
Frequency offset
The offset of the calculated centroid frequency to the defined center frequency of the
R&S
FPL1000 is indicated as a function result ("Occ Bw Freq Offset") in the marker
table.
Remote command:
The determined occupied bandwidth can also be queried using the remote command
CALC:MARK:FUNC:POW:RES? OBW
or
CALC:MARK:FUNC:POW:RES? AOBW
. While
the
OBW
parameter returns only the occupied bandwidth, the
AOBW
parameter also
returns the position and level of the temporary markers T1 and T2 used to calculate the
occupied bandwidth.
CALC:MARK:FUNC:POW:SEL OBW
, see
CALCulate<n>:MARKer<m>:FUNCtion:
POWer<sb>:SELect
on page 632
CALCulate<n>:MARKer<m>:FUNCtion:POWer<sb>[:STATe]
on page 632
CALC:MARK:FUNC:POW:RES? OBW
, see
CALCulate<n>:MARKer<m>:FUNCtion:
POWer<sb>:RESult?
on page 630
CALC:MARK:FUNC:POW:RES? COBW
, see
CALCulate<n>:MARKer<m>:FUNCtion:
POWer<sb>:RESult?
on page 630
7.2.6.3 OBW Configuration
Access : "Overview" > "Select Measurement" > "OBW" > "OBW Config"
Measurements and Results