Making Measurements 3
One-button Power Measurement
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 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.
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).
N9340A User’s Guide | 43 |