5Key Reference
114 N9342C/43C/44C User’s Guide
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).
ACPR
The adjacent channel power ratio (ACPR) measures
the power ratio between the main channel power
and the adjacent channel power.
ACPR measures the total power (RMS voltage) in
the specified channel. The measurement result
reports the ratios of the two adjacent channel
powers to the main channel power.
Center Frequency
Key access: [MEAS] > {ACPR} > {Center Freq}
Sets the center frequency of the main channel
power.
Main Channel
Key access: [MEAS] > {ACPR} > {Main Channel}
Specifies
the range of integration used in
calculating the power in the main channel. Use the
knob, the arrow
keys, or the numeric keypad to set
the bandwidth.
Adjacent Channel
Key access: [MEAS] > {ACPR} > {Adj Channel}
Specifies the range of integration used in
calculating the power in the adjacent channel. Use
the knob, the arrow keys, or the numeric keypad to
set the bandwidth.
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