Chapter 4 213
Key Function Descriptions
Key Descriptions
The graph can demonstrate how rapidly the ACP ratio
changes with channel spacing. The peak method or
analog method must be selected since the graph
function requires data that is only available with these
methods.
The upper graticule represents an ACP ratio of 0 dB.
The vertical scale for the ACP graph is the same as the
vertical scale for the spectrum trace, usually 10
dB/division. The horizontal scale represents the
channel spacing, with 0 Hz spacing in the center and a
scale factor that is the same as that for the spectrum
trace, or the frequency span divided by 10 divisions.
The ACP graph is not defined for channel spacings
where the graph is drawn at the bottom graticule line.
For these points, the channel bandwidth would include
frequencies beyond the edges of the screen, where no
data was taken.
Front-panel key access:
MEAS/USER
Figure 4-2 ACP Graph Display
ACPSTATE DFL CURR Allows you to select between using the default
state for measuring adjacent channel power, or using
the current state. In the default state the ACP function
will alter parameters as needed to make the
measurement. Using a current state allows you to
specify some of the measurement parametersso they do
not change while the measurement is being made.
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