Display - Agilent Technologies ESA-E Series User And Programming Manual

Front-Panel Key Reference

Display

Display
This front panel key accesses the menu key that allows you to see and setup
different measurement displays. For Modulation Analysis, it is used for the Error
Vector Magnitude (EVM) measurement.
I/Q Points
Allows you to specify the total number of I/Q points displayed, after each
measurement interval, in the Measured IQ Polar Vector diagram and in the I and Q
eye diagrams.
I/Q Points Offset This allows you to specify an offset from the first IQ point in the constellation
diagram. If you have opted to display only a subset of the I/Q Points, this subset of
displayed points is offset from the first IQ point by this I/Q Points Offset number of
points.
NOTE When you make a single measurement (press the
the data for that single measurement is held within instrument
memory. If you then set the I/Q Points Offset to 0, you can see how the
measurement is built up by slowly increasing the I/Q Points figure from zero using
the RPG knob.
Similarly you can set the I/Q Points figure to a low number (say, 5 or 10) and vary
the I/Q Points Offset figure using the RPG knob. Now you will see a 'snake'
marking out the signal's trace on the display.
Points/Symbol
This softkey determines the number of points displayed between symbols for
demodulated data. Selecting Points/Symbol brings up a sub-menu giving you
options of 1, 2, 4, 5 and 10 points per symbol.
For example, if the value of points/symbol is 1, each display point corresponds to a
symbol. If the value is 5, every 5th display point corresponds to a symbol - in this
case, a vector diagram would show 4 display points between each symbol.
NOTE Invalid option keys are grayed out. Valid options vary between demod formats.
Symbol Dots
Allows you to highlight the positions of the symbols on the polar vector trace by
Polar Vector
switching the display of symbol points on or off
Symbol Dots
Allows you to highlight the positions of the symbols on the graphical views by
Quad View
turning the display of the symbols on or off.
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Single key on the front panel),
Chapter 6