Configures the span and center frequency of the spectrum read by NI-RFSA. A spectrum acquisition consists of data surrounding the center frequency.

Supported Devices: PXI-5600, PXIe-5601/5603/5605/5606 (external digitizer mode), PXIe-5644/5645/5646, PXI-5661, PXIe-5663/5663E/5665/5667/5668, PXIe-5820/5830/5831/5832/5840/5841/5842/5860


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Inputs/Outputs

  • civrn.png instrument handle —

    instrument handle identifies your instrument session. instrument handle is obtained from the niRFSA Initialize VI or the niRFSA Initialize With Options VI.

  • cdbl.png frequency —

    frequency specifies the center frequency in a spectrum acquisition. The value is expressed in hertz (Hz). The NI-RFSA device you use determines the valid range. Refer to the specifications document for your device for more information about frequency range.

  • cdbl.png span —

    span specifies the span of a spectrum acquisition. The value is expressed in hertz (Hz).

    Note For the PXIe-5663/5663E/5665/5667/5668, NI-RFSA enables dithering by default. The dither noise can appear in your passband and affect measurements. Refer to the Digitizer Dither Enabled property for more information about dithering.
  • cerrcodeclst.png error in —

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

  • iivrn.png instrument handle out —

    instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niRFSA Initialize VI or the niRFSA Initialize With Options VI and identifies a particular instrument session.

  • ierrcodeclst.png error out —

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

    • Details

    Note If you configure the spectrum span (stop frequency– start frequency) to a value larger than the instantaneous bandwidth of the device, NI-RFSA performs multiple acquisitions and combines them into a spectrum of the size you requested.
    Note For the PXIe-5663/5663E, NI-RFSA does not support multispan acquisitions from frequency ranges that correspond with different instantaneous bandwidths. For example, you cannot configure a multispan acquisition that acquires one span from 110 MHz to 120 MHz and a second from 120 MHz to 130 MHz because the bandwidths that correspond to each span are different (10 MHz and 20 MHz, respectively).