Fetches the chain data-subcarriers RMS EVM per symbol trace. When you set the OFDMModAcc Averaging Enabled property to True, this VI returns the mean of the chain data RMS EVM per symbol computed for each averaging count.

Use "segment<n>/chain<k>" as the selector string to read results from this VI.


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Inputs/Outputs

  • cstr.png Selector String —

    Selector String specifies a selector string comprising of the signal name, result name, segment number, and chain number. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name, the default result instance is used. The default value is "segment0/chain0".

    Example:

    "segment0/chain0"

    "signal::sig1/segment0/chain0"

    "signal::sig1/result::r1/segment0/chain0"

    "result::r1/segment0/chain0"

    You can use the RFmxWLAN Build Chain String VI to build the selector string.

  • cgenclassrntag.png Instrument Handle In —

    Instrument Handle In specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize NIRFSA (Array) VI.

  • cdbl.png Timeout (s) —

    Timeout specifies the timeout for fetching the specified measurement. Set this value to an appropriate time, longer than expected for fetching the measurement. A value of -1 specifies that the VI waits until the measurement is complete. This value is expressed in seconds. The default value is 10.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • igenclassrntag.png Instrument Handle Out —

    Instrument Handle Out passes a reference of your RFmx session to the next VI.

  • icclst.png Chain Data RMS EVM per Symbol Mean (dB or %) —

    Chain Data RMS EVM per Symbol Mean returns the chain data-subcarriers RMS EVM per symbol trace.

  • idbl.png x0 —

    x0 returns the starting OFDM symbol index corresponding to the value of OFDMModAcc Meas Offset property.

  • idbl.png dx —

    dx returns the OFDM symbol increment value. This value is always equal to 1.

  • i1dsgl.png y —

    y returns an array of chain data-subcarriers RMS EVM of each OFDM symbol. When you set the OFDMModAcc EVM Unit property to Percentage, the measurement returns this result as a percentage. When you set the OFDMModAcc EVM Unit property to dB, the measurement returns this result in dB.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.