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desired units specifies the engineering units of the returned measurements.
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spurious free dynamic range units specifies the units for spurious free dynamic range.
| 0 | dB (default) | | 1 | ENOB Equivalent Number of Bits |
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detected fundamental amplitude units specifies the units for the amplitude of the detected fundamental tone.
| 0 | EU rms | | 1 | EU peak (default) | | 2 | EU peak-peak |
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dB reference for detected peaks specifies the units for amplitude in detected peaks.
| 0 | Fundamental | | 1 | dB ref (default) |
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scaled signal [EU] specifies the scaled signal expressed in the selected engineering units. To obtain a properly scaled signal, you can use the SVL Scale Voltage to EU VI or define a virtual channel in National Instruments Measurement & Automation Explorer (MAX).
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t0 is the start time of the waveform.
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dt is the time interval in seconds between data points in the waveform.
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Y contains the data values of the waveform.
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frequency range defines the frequency band of analysis.
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start frequency specifies the lowest frequency of interest for the analysis band in hertz. Specify a value of -1 to select f0 as the minimum frequency of interest.
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stop frequency specifies the highest frequency of interest for the analysis band in hertz. The valid range is between 0 and the Nyquist frequency. Specify a value of –1 to select the highest frequency as the maximum frequency of interest.
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advanced span [Hz] specifies a frequency span centered at the identified fundamental frequency in which noise and spurious components are ignored for the measurement. Specify a value of -1 to permit the measurement to automatically compute the minimum frequency span suitable for the time-domain window applied to the signal.
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threshold [dBc] specifies the level a spurious peak must exceed before this VI considers that peak as valid. You specify this threshold in dB relative to the fundamental tone amplitude. The value of threshold [dBc] should be less than 0.
If threshold [dBc] is greater than or equal to 0, this VI identifies only the single maximum spur, the length of detected peaks equals 1, and the index of the highest spur is 0. The default value of threshold [dBc] is Inf.
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error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use exception control to treat what is normally an error as no error or to treat a warning as an error. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
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code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
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exclude harmonics specifies whether this VI treats tones at multiples of the fundamental frequency as spurious tones. If exclude harmonics is TRUE, this VI does not use these harmonics to compute the SFDR.
If exclude harmonics is FALSE, this VI treats these harmonics as spurious tones. In this situation, this VI uses the maximum spur to compute the SFDR. The default value is FALSE.
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unit labels returns the unit label for each member of desired units.
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spurious free dynamic range unit label returns a string that corresponds to the selected spurious free dynamic range units.
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detected fundamental amplitude unit label returns the unit label for the amplitude of the detected fundamental tone.
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detected peaks amplitude unit label returns a string that corresponds to the selected units for peak amplitude.
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complex spectrum returns the complex form of the computed spectrum.
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complex spectrum returns the complex form of the spectrum.
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f0 returns the start frequency, in hertz, of the spectrum.
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df returns the frequency resolution, in hertz, of the spectrum.
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complex spectrum returns the complex form of the computed spectrum.
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spectrum info returns information about the spectrum needed by the Spectrum Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs. Do not modify the spectrum info values.
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spurious free dynamic range returns the dynamic range over which the input signal is free from spurious, or unwanted, sinusoidal components.
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detected peaks returns all the identified spectral peaks in the specified frequency range.
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frequency [Hz] returns the frequency of an individual peak in hertz.
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amplitude returns the amplitude of an individual peak.
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index of highest spur returns the array index of detected peaks for the spur with the maximum amplitude.
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
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code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
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detected fundamental amplitude returns the amplitude of the detected fundamental tone.
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detected fundamental frequency [Hz] returns the frequency of the detected fundamental tone in hertz.
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desired units specifies the engineering units of the returned measurements.
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spurious free dynamic range units specifies the units for spurious free dynamic range.
| 0 | dB (default) | | 1 | ENOB Equivalent Number of Bits |
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detected fundamental amplitude units specifies the units for the amplitude of the detected fundamental tone.
| 0 | EU rms | | 1 | EU peak (default) | | 2 | EU peak-peak |
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dB reference for detected peaks specifies the units for amplitude in detected peaks.
| 0 | Fundamental | | 1 | dB ref (default) |
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complex spectrum is the complex form of the computed spectrum.
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complex spectrum response is the complex form of the spectrum for the response channel.
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f0 specifies the start frequency, in hertz, of the spectrum.
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df specifies the frequency resolution, in hertz, of the spectrum.
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complex spectrum is the complex form of the computed spectrum.
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spectrum info contains information about the spectrum needed by the Spectrum Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs.
Do not modify the spectrum info values.
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frequency range defines the frequency band of analysis.
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start frequency specifies the lowest frequency of interest for the analysis band in hertz. Specify a value of -1 to select f0 as the minimum frequency of interest.
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stop frequency specifies the highest frequency of interest for the analysis band in hertz. The valid range is between 0 and the Nyquist frequency. Specify a value of –1 to select the highest frequency as the maximum frequency of interest.
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advanced span [Hz] specifies a frequency span centered at the identified fundamental frequency in which noise and spurious components are ignored for the measurement. Specify a value of -1 to permit the measurement to automatically compute the minimum frequency span suitable for the time-domain window applied to the signal.
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threshold [dBc] specifies the level a spurious peak must exceed before this VI considers that peak as valid. You specify this threshold in dB relative to the fundamental tone amplitude. The value of threshold [dBc] should be less than 0.
If threshold [dBc] is greater than or equal to 0, this VI identifies only the single maximum spur, the length of detected peaks equals 1, and the index of the highest spur is 0. The default value of threshold [dBc] is Inf.
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error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use exception control to treat what is normally an error as no error or to treat a warning as an error. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
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code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
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exclude harmonics specifies whether this VI treats tones at multiples of the fundamental frequency as spurious tones. If exclude harmonics is TRUE, this VI does not use these harmonics to compute the SFDR.
If exclude harmonics is FALSE, this VI treats these harmonics as spurious tones. In this situation, this VI uses the maximum spur to compute the SFDR. The default value is FALSE.
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unit labels returns the unit label for each member of desired units.
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spurious free dynamic range unit label returns a string that corresponds to the selected spurious free dynamic range units.
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detected fundamental amplitude unit label returns the unit label for the amplitude of the detected fundamental tone.
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detected peaks amplitude unit label returns a string that corresponds to the selected units for peak amplitude.
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dup complex spectrum returns complex spectrum unchanged.
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complex spectrum returns the complex form of the spectrum.
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f0 returns the start frequency, in hertz, of the spectrum.
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df returns the frequency resolution, in hertz, of the spectrum.
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complex spectrum returns the complex form of the computed spectrum.
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spectrum info returns information about the spectrum needed by the Spectrum Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs. Do not modify the spectrum info values.
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spurious free dynamic range returns the dynamic range over which the input signal is free from spurious, or unwanted, sinusoidal components.
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detected peaks returns all the identified spectral peaks in the specified frequency range.
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frequency [Hz] returns the frequency of an individual peak in hertz.
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amplitude returns the amplitude of an individual peak.
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index of highest spur returns the array index of detected peaks for the spur with the maximum amplitude.
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
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code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
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detected fundamental amplitude returns the amplitude of the detected fundamental tone.
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detected fundamental frequency [Hz] returns the frequency of the detected fundamental tone in hertz.
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