3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
Example
:DISP:EVM:WIND2:DATA SPEC
Sets the second window data to Spectrum
:DISP:EVM:WIND2:DATA?
Couplings Depends on window and modulation format
Preset Depends on window and modulation format
State Saved Yes
Range Raw Main Time | Spectrum | IQ Meas Time | IQ Ref Time | IQ Meas Spectrum | IQ Ref Spectrum | Error
Vector Time | Error Vector Spectrum | Mag Error | Phase Error | CH Freq Response | EQ Impulse
Response | Metrics | Demod Bits | Decode Results | FSK Meas Time | FSK Meas Spectrum | FSK Ref Time
| FSK Ref Spectrum |FSK Error Time | FSK Error Spectrum | Carrier Mag Error | No Data
The following trace data results are available for all modulation formats but 2-
FSK:
Trace Data SCPI Description
Raw Main Time
:RMTime
The envelope of the captured data record
Spectrum
:SPECtrum
Spectrum is the FFT of the Raw Main Time waveform
IQ Meas Time
:MTIMe
Demodulated Time Trace
IQ Meas Spectrum
:MSPEctrum
FFT of IQ Meas Time
IQ Ref Time
:RTIMe
Reconstructed ideal time waveform to compare IQ Meas Time against
IQ Ref Spectrum
:RSPEctrum
FFT of IQ Ref Time
Error Vector Time
:EVTime
Vector difference between IQ Meas Time and IQ Ref Time at each point in
time
Error Vector
Spectrum
:EVSPectrum
FFT of Error Vector Time
Mag Error
:MERRor
Difference in length of the IQ Meas Time vector and IQ Ref Time vector at
each point in time
Phase Error
:PERRor
Difference in phase of the IQ Meas Time vector and IQ Ref Time vector at
each point in time
EQ Impulse
Response
:EQIResponse
Impulse response of the adaptive equalizer (no data is available if equalizer
is off)
CH Freq Response
:CHFResponse
FFT of Equalizer Frequency Response
Metrics
:DEMResults
Demodulation metrics results
Demod Bits
:DEMBits
Demodulation bits
Decode Results
:DECResults
Decode metrics results and decode bits
No Data
NONE
Blank Trace
190 Short Range Comms & IoT Mode User's &Programmer's Reference
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