Agilent Technologies N9340A - Manual (Page 65)

Making Measurements 4
N9340A User’s Guide 63
One Button Measurement
N9340A provides one- button measurement
functionality on OBW
(Occupied Band Width) , channel
power and ACPR (Adjacent Channel Power Ratio) and
SEM (Spectrum Emission Mask) as an easy- to- use
access for your measurement of interest.
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.
The occupied bandwidth measurement can be made
in 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
will set 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).