Owning Palette: Baseband Subset VIs

Requires: Sound and Vibration Toolkit

Computes a subset of the power spectral density of scaled signal [EU] . The subset is defined by frequency range . Each block of data corresponds to a single FFT block and has to be passed individually to this VI. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.

SVFA Power Spectral Density Subset (1 Ch)SVFA Power Spectral Density Subset (N Ch)

SVFA Power Spectral Density Subset (1 Ch)

desired units specifies if the results are expressed in EU^2/Hz or EU/sqrt(Hz).
0 EU^2 / Hz (default)
1 EU / sqrt(Hz)
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).
t0 specifies the start time of the waveform.
dt specifies the time interval in seconds between data points in the waveform.
Y specifies the data values of the waveform.
window specifies the time-domain window used. The default is Hanning.
0 None
1 Hanning (default)
2 Hamming
3 Blackman-Harris
4 Exact Blackman
5 Blackman
6 Flat Top
7 4 Term B-Harris
8 7 Term B-Harris
9 Low Sidelobe
11 Blackman Nuttall
30 Triangle
31 Bartlett-Hanning
32 Bohman
33 Parzen
34 Welch
60 Kaiser
61 Dolph-Chebyshev
62 Gaussian
frequency range specifies the frequency band of analysis. The valid range for the start frequency and for the stop frequency is between 0 and the Nyquist frequency.
start frequency specifies the lowest frequency of interest for the analysis band in hertz. The valid range is between 0 and the Nyquist frequency. The default is 1,000.00 Hz.
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. The default is 5,000.00 Hz.
dB On specifies whether the results are expressed in decibels. The default is FALSE.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
averaging parameters specifies how the VI computes the averaging. The specifications of the parameters include the type of averaging, the type of weighting, and the number of averages.
Note When you set averaging mode to No averaging , the VI ignores the weighting mode , number of averages , and linear mode settings.
averaging mode specifies the averaging mode.
0 No averaging (default)
1 Vector averaging
2 RMS averaging
3 Peak hold
weighting mode specifies the weighting mode. The default is exponential.
Note RMS and vector averaging support linear and exponential weighting.
0 Linear
1 Exponential (default)
number of averages specifies the number of averages used by the selected weighting mode . The default is 10. If weighting mode is set to Linear , the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear . If you set weighting mode to Exponential , linear mode is ignored.
0 One shot (default)€”Specifies that the averaging process stops once the value of number of averages is reached.
1 Auto restart €”Specifies that the averaging process automatically restarts after the value of number of averages is reached.
restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
power spectral density [EU^2 rms / Hz] returns the power spectral density.
f0 returns the start frequency, in hertz, of the spectrum.
df returns the frequency resolution, in hertz, of the spectrum.
magnitude returns the magnitude of the power spectral density.
unit label returns the selected engineering units.
spectrum info returns information about the spectrum needed by the Spectrum Extended Measurements VIs, the Display VIs, and the Tone and Distortion VIs.
Note You must wire spectrum info when performing extended measurements. Do not modify the spectrum info values. If you want to view the information, you can right-click the spectrum info wire and select Custom Probe»Spectrum Info from the shortcut menu.
error out contains error information. This output provides standard error out functionality.
averages completed returns the number of averages completed by the VI at that time.
averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters . Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging .

SVFA Power Spectral Density Subset (N Ch)

desired units specifies if the results are expressed in EU^2/Hz or EU/sqrt(Hz).
0 EU^2 / Hz (default)
1 EU / sqrt(Hz)
scaled signals [EU] specifies the scaled signals 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).
t0 specifies the start time of the waveform.
dt specifies the time interval in seconds between data points in the waveform.
Y specifies the data values of the waveform.
window specifies the time-domain window used. The default is Hanning.
0 None
1 Hanning (default)
2 Hamming
3 Blackman-Harris
4 Exact Blackman
5 Blackman
6 Flat Top
7 4 Term B-Harris
8 7 Term B-Harris
9 Low Sidelobe
11 Blackman Nuttall
30 Triangle
31 Bartlett-Hanning
32 Bohman
33 Parzen
34 Welch
60 Kaiser
61 Dolph-Chebyshev
62 Gaussian
frequency range specifies the frequency band of analysis. The valid range for the start frequency and for the stop frequency is between 0 and the Nyquist frequency.
start frequency specifies the lowest frequency of interest for the analysis band in hertz. The valid range is between 0 and the Nyquist frequency. The default is 1,000.00 Hz.
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. The default is 5,000.00 Hz.
dB On specifies whether the results are expressed in decibels.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
averaging parameters specifies how the VI computes the averaging. The specifications of the parameters include the type of averaging, the type of weighting, and the number of averages.
Note When you set averaging mode to No averaging , the VI ignores the weighting mode , number of averages , and linear mode settings.
averaging mode specifies the averaging mode.
0 No averaging (default)
1 Vector averaging
2 RMS averaging
3 Peak hold
weighting mode specifies the weighting mode. The default is exponential.
Note RMS and vector averaging support linear and exponential weighting.
0 Linear
1 Exponential (default)
number of averages specifies the number of averages used by the selected weighting mode . The default is 10. If weighting mode is set to Linear , the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear . If you set weighting mode to Exponential , linear mode is ignored.
0 One shot (default)€”Specifies that the averaging process stops once the value of number of averages is reached.
1 Auto restart €”Specifies that the averaging process automatically restarts after the value of number of averages is reached.
restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
power spectral densities [EU^2 rms / Hz] returns the power spectral density for each channel.
f0 returns the start frequency, in hertz, of the spectrum.
df returns the frequency resolution, in hertz, of the spectrum.
magnitude returns the magnitude of the power spectral density.
unit labels returns the selected engineering units for each channel.
spectrum info returns information about the spectrum needed by the Spectrum Extended Measurements VIs, the Display VIs, and the Tone and Distortion VIs.
Note You must wire spectrum info when performing extended measurements. Do not modify the spectrum info values. If you want to view the information, you can create a custom probe.
error out contains error information. This output provides standard error out functionality.
averages completed returns the number of averages completed by the VI at that time.
averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters . Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging .