Calculates the DC and RMS values of an input waveform or array of waveforms. This VI is similar to the Averaged DC-RMS VI, but this VI returns only one DC value and one RMS value per input waveform.

Wire data to the signal in input to determine the polymorphic instance to use or manually select the instance.


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Inputs/Outputs

  • cbool.png reset —

    reset resets the history of your time signal. You typically use reset to reset the exponentially averaged measurement.

  • cmsdt.png signal in —

    signal in is the input waveform.

  • cenum.png averaging type —

    averaging type is the type of averaging used during the measurement. Because this VI computes one DC and one RMS value per input waveform, the input record length selects the averaging time. If averaging type is exponential, this VI calculates the DC and RMS values using an exponentially weighted averaging measurement starting from the previous DC and RMS values.

    0Linear—Averaging time is equal to the record length.
    1Exponential—Time constant is half the record length.
  • cenum.png window —

    window is the window to be applied to the time record before DC/RMS computation. LabVIEW ignores this input if averaging type is exponential.

    0
    Rectangular
    (no window)
    1
    Hanning
    2
    Low side lobe
  • cerrcodeclst.png error in (no error) —

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

  • idbl.png DC value —

    DC value is the measured DC value in volts if the signal is in volts.

  • idbl.png RMS value —

    RMS value is the measured RMS value in volts if the signal is in volts.

  • ierrcodeclst.png error out —

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

  • icclst.png measurement info —

    measurement info returns information about your measurement, mainly warnings for inconsistencies in your input signal.

  • idbl.png uncertainty —

    uncertainty is reserved for future use.

  • ibool.png Warning —

    Warning is TRUE if a warning is generated during processing.

  • istr.png comments —

    comments contains a warning message when Warning is TRUE.

    • This VI is designed to process a single channel or multiple channels continuously, typically from within a For Loop or a While Loop.

    Note The Basic Averaged DC-RMS VI assumes that consecutive data blocks are continuous. If they are not, the VI returns a warning.