Configures the method for performing the adjacent channel power (ACP) measurement.


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Inputs/Outputs

  • cstr.png Selector String —

    Selector String specifies a selector string comprising of the signal name. If you do not specify the signal name, the default signal instance is used. The default value is "" (empty string).

    Examples:

    ""

    "signal::sig1"

    You can use the RFmxEVDO 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.

  • ci32.png Measurement Method —

    Measurement Method specifies the method for performing the ACP measurement. The default value is Normal.

    Normal (0) The ACP measurement acquires the spectrum using the same signal analyzer setting across frequency bands. Use this method when measurement speed is desirable over higher dynamic range.
    Dynamic Range (1) The ACP measurement acquires the spectrum using the hardware-specific optimizations for different frequency bands. Use this method to get the best dynamic range. Supported Devices: PXIe-5665/5668R.
    Sequential FFT (2) The ACP measurement acquires I/Q samples for a duration specified by the ACP Sweep Time property. These samples are divided into smaller chunks. The size of each chunk is defined by the defined by the ACP Sequential FFT Size property, and FFT is computed on each of these chunks. The resultant FFTs are averaged to get the spectrum and is used to compute ACP. If the total acquired samples is not an integer multiple of the FFT size, the remaining samples at the end of acquisition are not used for the measurement. Use this method to optimize ACP measurement speed. The accuracy of the results may be reduced when using this measurement method.

    For accurate power measurements when the power characteristics of the signal vary over time, averaging is allowed.

    The following properties have limited support when you set the ACP Meas Method property to Sequential FFT.

    Note For multi-span FFT, the averaging count should be 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 to your RFmx session to the next VI.

  • ierrcodeclst.png error out —

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