Chapter 3 Spectrum Analysis Operation
Special measurement functions
9102 Handheld Spectrum Analyzer Software version 5.31
75
Special measurement functions
Within spectrum analysis mode, three different frequency-selective
types of power measurements are supported:
– Channel power
– Adjacent channel power ratio (ACPR)
– Occupied bandwidth (OBW)
These are similar to the measurement types in channel power mode
(see chapter “Channel Power Operation” on page 81), without the
restrictions that the channel power mode poses with predefined
parameters such as span and resolution bandwidth.
Channel power This measurement includes the power of the selected channel. A
channel is defined by center frequency and channel width (not the
span in this case); see “Changing the channel width” on page 78.
The 9102 displays the numerical result of the channel power measure-
ment on the top-left. The measured bandwidth is indicated graphically
with bandwidth boundaries shown in red.
Adjacent channel power
ratio (ACPR)
ACPR is the relation between the power transmitted in a neighboring
(upper and/or lower) channel and that in the communication channel
used. The measurement can be used to assess the quality of the modu-
lator and the transmitter. The higher the result, the worse the trans-
mitter because transmission in other channels may interfere with
another ongoing communication.
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