Keysight Technologies N9340B User Manual page 108

Key Reference
MEAS
Channel Power
Channel power function measures the power and power
spectral density in the channel bandwidth specified.
One pair of vertical lines of the displayed green frame
indicates the edges of the channel bandwidth. The
center frequency, reference level, and channel
bandwidth must be set by the user.
The power calculation method used to determine the
channel power is a traditional method known as the
integration bandwidth (IBW) method. A swept spectrum
is used as the basis for this calculation. Therefore, it is
important to set the resolution bandwidth correctly
before making this measurement using the following
formula:
Where k is a value between 1.2 and 4.0 and n is the
number of trace points.
Center Frequency
Key access: [MEAS] > {Channel Power} > {Center Freq}
Sets the center frequency of the display.
Integration Bandwidth
Key access: [MEAS] > {Channel Power} > {Int BW}
Specifies the bandwidth of integration bandwidth,
which can range from 100 Hz to 3 GHz to calculate the
power in a channel. For example, set the main (center)
channel bandwidth. The green frame indicates the
integration bandwidth.
Channel Bandwidth
Key access: [MEAS] > {Channel Power} > {Channel BW}
Sets the analyzer span for the channel power
measurement using the knob, the arrow keys or the
numeric keypad. Be sure the span is set between 1 and
10 times the integration bandwidth.
102
k Span

RBW = ------------ -
n