3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
IQ Meas Time is the measured time data results for the input signal. There are 6
available formats for this trace data: I-Q, Constellation, Real, Imaginary, I-Eye and
Q-Eye. Normally this trace data is displayed with I-Q format.
Format name Description
I-Q Real part of data is shown on horizontal axis, imaginary part is shown on vertical
axis, Independent variable (X axis) is normal to display
Constellation Same as I-Q, but for data with symbols defined, only the symbol points are
shown as dots with no connecting lines
Real (I) Real part of data is shown on a linear Y axis
Imaginary (Q) Imaginary part of data is shown on linear Y axis
I-Eye Real part of data is shown with X axis segmented (generally into 2 symbol
segments) and each segment is overlaid to show signal crossings at symbol
boundaries
Q-Eye Same as I-eye but imaginary part of data is shown
Example
:DISP:EVM:WIND:DATA MTIM
sets the first window data to IQ Meas Time
:DISP:EVM:WIND:FORM CONS
selects Constellation as the first window data format
IQ Ref Time
Available only for all modulation formats but 2-FSK.
IQ Ref Time is the reconstructed ideal time waveform to compare IQ Meas Time
against. There are 6 available formats for this trace data: I-Q, Constellation, Real,
Imaginary, I-Eye and Q-Eye. Normally this trace data is displayed with I-Q format.
Format Name Description
I-Q Real part of data is shown on horizontal axis, imaginary part is shown on vertical axis, Independent
variable (X axis) is normal to display
Constellation Same as I-Q, but for data with symbols defined, only the symbol points are shown as dots with no
connecting lines
Real (I) Real part of data is shown on a linear Y axis
Imaginary (Q) Imaginary part of data is shown on linear Y axis
I-Eye Real part of data is shown with X axis segmented (generally into 2 symbol segments) and each segment
is overlaid to show signal crossings at symbol boundaries
Q-Eye Same as I-eye but imaginary part of data is shown
Example
:DISP:EVM:WIND:DATA RTIM
sets the first window data to IQ Ref Time
:DISP:EVM:WIND:FORM CONS
selects Constellation as the first window data format
192 Short Range Comms & IoT Mode User's &Programmer's Reference
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