User`s guide

5Key Reference
100 N9340B User’s Guide
MEAS
Hardkey menu access.
In spectrum analysis mode, pressing [MEAS] brings
up the menu for a suite of power measurements
such as adjacent channel power, occupied
bandwidth, and channel power.
OBW
Occupied Bandwidth (OBW) integrates the power
of the spectrum in the displayed green frame. The
measurement defaults to 99% of the occupied
bandwidth power.
Occupied bandwidth measurement are made in
either single or continuous sweep mode.
Selecting a Method
Press [MEAS] > {OBW} > {Method} to toggle the
occupied bandwidth measurement mode between
percentage (%) and dBc.
• Setting Percentage (%)
Press {OBW} > {Method} > {Percent} to edit the
percentage of signal power used when determining
the occupied bandwidth. Press {%} to set the
percentage ranging from 10.00% to 99.99%.
• Setting dBc
Press {OBW} > {Method} > {dBc} to specify the power
level used to determine the emission bandwidth as
the number of dB down from the highest signal
peak, within the occupied bandwidth span. This
function is an
independent calculation from the
OBW calculation. The x dB bandwidth result is also
called the emissions bandwidth (EBW). This sets
the green frame (f1 and f2 are the two cross points
of the signal and the pair of vertical lines of the
displayed green frame) to your specified dB value
below the maximum power, and compute the total
power in the frame. The emission bandwidth is
then calculated ranging from 0.1 dB to 100 dB (the
default value is set to 26 dB).