Table Of Contents

Spectrum Unit Conversion (G Dataflow)

Version:
    Last Modified: March 15, 2017

    Converts either the power, amplitude, or gain (amplitude ratio) spectrum to alternate formats including Log (decibel and dbm) and spectral density.

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    dB type

    Linear or log spectrum output.

    Name Description
    Linear Returns the linear spectrum output.
    dB Returns the logarithmic spectrum output in dB.
    dBm Returns the logarithmic spectrum output in dBm.

    Default: dB

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    signal unit

    A string containing the unit of the input time domain signal.

    If the original signal unit was in volts, this input should contain the letter V for volts.

    Default: V

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    spectrum in

    The input spectrum of a time domain signal.

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    spectrum type

    Type of spectrum.

    Name Description
    Power (Vrms^2)

    Sets the type to power.

    Amplitude (Vrms)

    Sets the type to amplitude.

    Gain (amplitude ratio)

    Sets the type to gain.

    Default: Power (Vrms^2)

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    window constants

    The window constants for the selected window.

    You obtain window constants from the Window Properties node. You need this input only when you use the spectral density output formats, the last four output unit selections.

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    eq noise BW

    The equivalent noise bandwidth (ENBW) of the window that was used. You can use this value to divide a sum of individual power spectra of the power spectrum or to compute the power in a given frequency span.

    Default: 1.0

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    coherent gain

    The inverse of the scaling factor applied to the window.

    Default: 1.0

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    display unit

    The output unit for the spectrum.

    Name Description
    Vrms

    Displays units in volts rms.

    Vpk

    Displays units in volts peak.

    Vrms^2

    Displays units in squared rms.

    Vpk^2

    Displays units in squared peak.

    Vrms/rtHz

    Displays units in rms per root Hz.

    Vpk/rtHz

    Displays units in peak per root Hz.

    Vrms^2/Hz

    Displays units in squared rms per Hz.

    Vpk^2/Hz

    Displays units in squared peak per Hz.

    Default: Vrms

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    df

    The line frequency interval of the input spectrum. You need this input only when you use the spectral density output formats (the last four display unit selections).

    Default: 1.0

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    spectrum out

    The output spectrum.

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    spectrum unit

    A string containing the unit of the output spectrum. If the output spectrum is in decibels form, the unit is prepended by dB.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: This product does not support FPGA devices


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