138 Chapter 3
Mode
Adjacent Channel Power—ACP (I&M) Measurement
Mode
Format/BW
Accesses menu keys that enable you to set and define the measurement parameters for the
ACP measurement.
When performing an adjacent channel power measurement, you may specify the channel
standard determined by the modulation type of the signal you are trying to measure
(CDMA, GSM, etc.). In addition, you may customize the measurement by specifying
several measurement settings. The measurement settings include bandwidth and
measurement time for the center channel and the following measurement settings for the
adjacent channels:
• number of adjacent channels
• offset of the first adjacent channel from the center channel
• offset of the adjacent channels from each other
• measurement bandwidth and measurement time for adjacent channel (one setting for
all adjacent channels)
These settings determine how the analyzer measures the center channel and its adjacent
channels. Depending on the modulation type of the signal you are trying to measure
(CDMA, GSM, etc.), different measurement bandwidths, times, and offsets are required.
Format Type Sets the method you want to use to determine the measurement parameters.
Default adjacent channel power measurement settings, called ACP formats, are provided
in the Agilent CSA platforms. Generally, the ACP format is determined by the channel
standard you select. However, to accommodate your particular situation, you can decouple
the default formats from the channel standard, or you can change each measurement
setting independently. The three methods of selecting your measurement settings are:
Chan (Channel): Each channel standard has an associated ACP format. With this method,
the optimum measurement bandwidth and measurement time for the modulation type are
automatically selected when you set the channel standard. For example, when you select
GSM–950 as the channel standard, with this method the analyzer selects the bandwidth
and time and adjacent channel offsets for the GSM format.
Preset 1
Min 1
Max 4096
Key Path
Meas Setup, Avg Number
Key Path: Meas Setup, Format/BW
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