Rohde & Schwarz FSVA - Softkeys for Occupied Bandwidth (OBW) Measurements

Instrument Functions
R&S
®
FSVA/FSV
342Operating Manual 1176.7510.02 ─ 09
Some of the measurement specifications (e.g. PDC, RCR STD-27B) require measure-
ment of the occupied bandwidth using a peak detector. The detector setting of the
R&S FSVA/FSV has to be changed accordingly then.
A remote control programming example is described in Chapter 4.3.5, "Occupied
Bandwidth Measurement", on page 1025.
To determine the occupied bandwidth
1. Press the OBW softkey to activate the measurement of the occupied bandwidth.
The corresponding submenu is displayed.
2. Press the "% Power Bandwidth" softkey to enter the percentage of power (see "%
Power Bandwidth (span > 0)" on page 343).
3. To change the channel bandwidth for the transmission channel, press the "Channel
Bandwidth" softkey (see "Channel Bandwidth (span > 0)" on page 343).
4. To optimize the settings for the selected channel configuration, press the Adjust
Settings softkey. For details see also "Optimized Settings for CP/ACLR Test
Parameters" on page 336.
5. To adjust the reference level to the measured total power after the first sweep,
press the Adjust Ref Lvl softkey.
Measurement 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 OBW calculation is repeated if the Search Limits are changed, without performing
a new sweep. Thus, the OBW for a multi-carrier signal can be determined using only
one sweep.
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.
Softkeys for Occupied Bandwidth (OBW) Measurements
OBW............................................................................................................................343
└ % Power Bandwidth (span > 0).................................................................... 343
└ Channel Bandwidth (span > 0)..................................................................... 343
└ Adjust Ref Lvl (span > 0).............................................................................. 343
└ Adjust Settings..............................................................................................344
Measurement Functions