3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
If the modulation format is 2-FSK, then the following replace the IQ
measurement and reference time and spectrum data, and error vector
magnitude data:
Trace Data SCPI Description
FSK Meas Time
:MTIMe
Demodulated Time Trace
FSK Meas Spectrum
:MSPEctrum
FFT of FSK Meas Time
FSK Ref Time
:RTIMe
Reconstructed ideal time waveform to compare FSK Meas Time against
FSK Ref Spectrum
:RSPEctrum
FFT of FSK Ref Time
FSK Error Time
:EVTime
Difference between FSK Meas Time and FSK Ref Time at each point in time
FSK Error Spectrum
:EVSPectrum
FFT of FSK Error Spectrum
Carrier Mag Error
:MERRor
Amplitude error of carrier, relative to average amplitude
Pre Demod
Displays the trace data choices that show pre-demodulation results.
Raw Main Time
Raw main time is the envelope of the captured raw data. This data is unprocessed
and includes additional points acquired for settling of the filters involved in
subsequent processing, such as the demodulation filtering.
Example
:DISP:EVM:WIND2:DATA RMT
sets the second window data to Raw Main Time
Spectrum
Spectrum shows the FFT of the Raw Main Time waveform.
Example
:DISP:EVM:WIND3:DATA SPEC
sets the third window data to Spectrum
Demod
Displays the general demodulation results.
IQ Meas Time
Available only for all modulation formats but 2-FSK.
Short Range Comms & IoT Mode User's &Programmer's Reference 191
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