Instrument Functions
R&S
®
FSVA/FSV
343Operating Manual 1176.7510.02 ─ 09
OBW
Activates measurement of the occupied bandwidth according to the current configura-
tion and opens a submenu to configure the measurement. The occupied bandwidth is
displayed in the marker display field and marked on the trace by temporary markers.
For details see Chapter 3.3.5.4, "Measuring the Occupied Bandwidth", on page 340.
This measurement is not available in zero span.
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 the Marker to Trace soft-
key in the "Marker" menu).
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:POWer:SELect on page 703
CALCulate<n>:MARKer<m>:FUNCtion:POWer:RESult? on page 700
CALCulate<n>:MARKer<m>:FUNCtion:POWer[:STATe] on page 704
% Power Bandwidth (span > 0) ← OBW
Opens an edit dialog box to enter the percentage of total power in the displayed fre-
quency range which defines the occupied bandwidth. Values from 10% to 99.9% are
allowed.
Remote command:
[SENSe:]POWer:BANDwidth|BWIDth on page 850
Channel Bandwidth (span > 0) ← OBW
Opens an edit dialog box to enter the channel bandwidth for the transmission channel.
The specified channel bandwidth is used for optimization of the test parameters (for
details see "Optimized Settings for CP/ACLR Test Parameters" on page 336). The
default setting is 14 kHz.
For measurements in line with a specific transmission standard, the bandwidth speci-
fied by the standard for the transmission channel must be entered.
Remote command:
[SENSe:]POWer:ACHannel:BANDwidth|BWIDth[:CHANnel<channel>]
on page 842
Adjust Ref Lvl (span > 0) ← OBW
Adjusts the reference level to the measured total power of the signal. the softkey is
activated after the first sweep with active measurement of the occupied bandwidth has
been completed and the total power of the signal is thus known.
Adjusting the reference level ensures that the signal path will not be overloaded and
the dynamic range not limited by too low a reference level. Since the measurement
bandwidth for channel power measurements is significantly lower than the signal band-
width, the signal path may be overloaded although the trace is distinctly below the ref-
erence level. If the measured channel power is equal to the reference level, the signal
path cannot be overloaded.
Remote command:
[SENSe:]POWer:ACHannel:PRESet:RLEVel on page 847
Measurement Functions
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