3 VMA Mode
3.1 Digital Demod Measurement
Ideal State Size
Determines the ideal state size, as a percentage of the maximum ideal state
distance from the origin (the same way Error Vector Magnitude is defined). Ideal
states are shown as circles or crosses in Vector and constellation diagrams, as
determined by the Ideal State Shape setting.
The ideal state is where symbols occur if your signal is without error. Showing the
ideal states gives a visual indication of the quality of your signal.
You can use this feature to determine if symbols have an EVM above a specified
Value. For example, to see if any symbols have an EVM greater than 10%, set the
state size to 10% and select Circle as the shape. Any symbols that fall outside of the
circle (other than SYNC or PILOT symbols) have an EVM greater than 10%.
Remote
Command
:DISPlay:DDEMod:SYMBol:SIZE <real>
:DISPlay:DDEMod:SYMBol:SIZE?
Example
:DISP:DDEM:SYMB:SIZE 10
:DISP:DDEM:SYMB:SIZE?
Notes Parameter is interpreted as a percent, for example, if you want the ideal size to be 10% send 10, not 0.1
Preset 5
State Saved Yes
Min 0.1
Max 50
3.1.6.2 View
Contains controls for selecting the current View, and for editing User Views.
Views
Lets you choose a View from the predefined Views for the current measurement. The
Views vary from measurement to measurement. See the “Views” section of your
measurement’s help for a list of all the Views supported by your measurement.
If you have modified the current View, using the "View Editor" on page 156, an
asterisk appears next to that View in the radio button panel. You can save the
modified View as a User View (see "Save Layout as New View" on page 1808).
Vector Modulation Analyzer Mode User's &Programmer's Reference 276
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