212 Chapter4
Key Function Descriptions
Key Descriptions
In addition to the warning messages for invalid
instrument-state parameters listed above,thefollowing
three error messages may be observed in the lower
right corner of the display:
• ERR 908 BW>>SPCG indicates that the channel
bandwidth is too wide, compared to the channel
spacing, for a valid computation.
• ERR 909 SPAN<ACP indicates that the frequency
span is too narrow to obtain a valid measurement.
• ERR 910 SPAN>ACP indicates that the frequency
span is too wide, compared to the channel
bandwidth, to obtain an accurate measurement.
If any of the three errors occurs, the measurement is
not completed. To correct themeasurement, adjust your
instrument state settings depending on the error that
has occurred.
Front-panel key access:
MEAS/USER
ACP MENU Accesses the adjacent channel power (ACP) menu of
softkeys that measures the adjacent channel power
ratio of a transmitter. The softkeys that are accessed by
ACP MENU are ACP AUTO MEASURE, ACP
COMPUTE, ACPGRAPH ON OFF, and ACP SETUP.
Front-panel key access:
MEAS/USER
ACP SETUP Accesses the ACP setup functions. Many different
measurement parameters can be set from this menu.
Some of the parameters are interactive. Changing one
parameter can change other parameters, or add and
delete parameters. There are different measurement
methods for measuring adjacent channel power and
each method has several different parameters
associated with it.
Different measurement methods are required by the
different standards. Table 2-10 on page 63, included in
chapter 2, relates the measurement methods to the
various communications standards and formats.
Front-panel key access:
MEAS/USER
ACP GRAPH ON OFF Displays a graphical representation of the
adjacent channel power (ACP) ratio for the selected
channel bandwidth, as a function of the channel
spacing, using power integration (refer to the ANALOG
METHOD softkey description.)
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