Technical data

Measure (Spectrum Analysis Mode) 14
Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 239
Channel Power
Channel Power measures the power and power spectral density in the channel bandwidth
that you specify. One marker pair on the display indicates the edges of the channel
bandwidth. The center frequency, reference level, and channel bandwidth must be set by
the user. For more information see“Meas Setup (Channel Power—CHP)" on page 270.
You can configure measurement settings by pressing Meas Setup after selecting Channel
Power. You can make a measurement in single or continuous sweep mode. Pressing Meas
Control enables you to pause or restart a measurement, or toggle between continuous and
single measurement. To set Ref Level automatically, use Meas Setup, Optimize Ref Level.
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.
C
Figure 3 Channel Power Measurement Results
RBW k span()n⁄=
NOTE
Because of the noise-like nature of the signals being measured, the video bandwidth should
be ≥ 10 times the resolution bandwidth.