Rohde & Schwarz EMI Test ReceiverESCI Operating Manual page 299

R&S ESCI
Measurement of Occupied Bandwidth
An important characteristics of a modulated signal is its occupied bandwidth. In a radio communications
system for instance the occupied bandwidth must be limited to enable distortion-free transmission in
adjacent channels. The occupied bandwidth is defined as the bandwidth containing a defined
percentage of the total transmitted power. A percentage between 10% and 99.9% can be set on the
R&S ESCI.
MEAS OCCUPIED BANDWIDTH menu:
OCCUP BW
OCCUPIED
ON
BANDWIDTH
% POWER
BANDWIDTH
CHANNEL
BANDWIDTH
NOISE CORR
ON
ADJUST
SETTINGS
ADJUST
REF LVL
OCCUP BW The OCCUP BW ON/OFF softkey switches measurement of the occupied
ON OFF
bandwidth on or off.
IEC/IEEE-bus command:
% POWER The % POWER BANDWIDTH softkey opens the entry of the percentage of
BANDWIDTH
power related to the total power in the displayed frequency range which defines
the occupied bandwidth (percentage of total power).
The valid range of values is 10% to 99.9%.
IEC/IEEE-bus command:
The CHANNEL BANDWIDTH softkey opens an input window for defining the
CHANNEL
BANDWIDTH
channel bandwidth for the transmission channel. For measurements in line with
a specific transmission standard, the bandwidth specified by the standard for the
transmission channel must be entered.
The default setting is 14 kHz.
The specified channel bandwidth is used for optimization of the test parameters
of the R&S ESCI with ADJUST SETTINGS .
IEC/IEEE-bus command:
1166.6004.12
The OCCUPIED
OFF
measurement of the occupied bandwidth according to the
current configuration and opens the submenu for configuring
the measurement. The softkey is available only in frequency
domain (span > 0) and is highlighted when the measurement
is switched on.
In the spectrum display mode, this measurement determines
the bandwidth that contains a predefined percentage of the
power of the displayed frequency range ( % POWER
BANDWIDTH softkey ) . The occupied bandwidth is output in
the marker display field and marked on the trace by
temporary markers.
OFF
Note:
4.167
BANDWIDTH
- The softkey is only available in the frequency
domain (span > 0).
- The measurement is performed on the trace
with marker 1. In order to evaluate another
trace, marker 1 must be placed on another trace
by means of SELECT TRACE in the MKR menu
CALC:MARK:FUNC:POW:SEL OBW
CALC:MARK:FUNC:POW:RES? OBW
CALC:MARK:FUNC:POW OFF
SENS:POW:BWID 99PCT
SENS:POW:ACH:BWID 14kHz
Analyzer - MEAS
softkey activates
E-1