Fetches I/Q data from a single record in an acquisition.


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Inputs/Outputs

  • cstr.png Selector String —

    Selector String specifies a selector string comprising of the signal name and result name. 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 "" (empty string).

    Example:

    "signal::sig1"

    "result::r1"

    "signal::sig1/result::r1"

    You can use the RFmxSpecAn Build Signal 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.

  • cdbl.png Timeout (s) —

    Timeout specifies the timeout, in seconds, 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. The default value is 10.

  • ci32.png Record to Fetch —

    Record to Fetch specifies the record to retrieve. Record numbers are zero-based. The default value is 0.

  • ci64.png Samples to Read —

    Samples to Read specifies the number of samples to fetch. A value of -1 specifies that RFmx fetches all samples. The default value is -1.

  • 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 Data —

    Data returns the data acquired by the I/Q measurement as a cluster.

  • idbl.png t0 —

    t0 returns the start time of the first sample. The timestamp corresponds to the difference, in seconds, between the first sample returned and the Reference Trigger location.

  • idbl.png dt —

    dt returns the time interval between data points in the acquired signal. The I/Q data sample rate is the reciprocal of this value.

  • i1dcsg.png Y —

    Y returns the complex-value time domain data array. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively. To calculate the instantaneous power of a sampled I/Q point, use the equation (I 2 + Q 2) / 2R, where R is the input impedance in ohms. For RFmx, R = 50 ohms.

  • ierrcodeclst.png error out —

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