User`s guide

Making Measurements 4
N9340A User’s Guide 59
One-button Power Measurement
The N9340A provides one- button measurement
functionality on OBW
(Occupied Band Width),
Channel Power and ACPR
(Adjacent Channel Power
Ratio)
as an easy- to- use access for these
measurements.
Measuring 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 measurements 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).