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Owning Palette: S&V Express Measurements Express VIs

Installed With: Sound and Vibration Measurement Suite. This topic might not match its corresponding palette in LabVIEW depending on your operating system, licensed product(s), and target.

Use the Frequency-Domain Measurements Express VIs to perform frequency domain transformations and frequency domain analysis.

The VIs on this palette can return ranges of LabVIEW error codes or specific sound and vibration error codes.

Palette Object	Description
Frequency Response	Computes the frequency response and the coherence based on the stimulus and response input signals and returns the results as magnitude, phase, and coherence.
Noise Measurements	Performs common noise measurements when expecting a stationary, stochastic signal on the input channel. These common measurements include spectrum-based computations of the noise power, noise level, and maximum noise spur within the specified frequency range. Because the frequency range of interest can include low frequencies, you can use this step to measure and remove the DC component of the signal before performing additional computations.
Octave Analysis	Performs fractional-octave analysis, including 1/1, 1/3, 1/6, 1/12, and 1/24 octave for a single channel or N channels. You also can apply A-, B-, or C-weighting to the octave spectrum.
Peak Search	Performs a peak search in the frequency domain. You can detect a single or multiple peaks in a magnitude spectrum or power spectrum. You can specify the magnitude threshold and frequency range to fine-tune the peak search.
Power in Band	Computes the total power in the range of interest for power, power spectral density (PSD), and magnitude spectra.
Power Spectrum	Computes the averaged magnitude spectrum, power spectrum, or power spectral density for a single or multiple channels. This step can return the spectra in root-mean-square, peak, and peak-to-peak units.
Swept Sine	Performs frequency response measurements by outputting a customizable sweep of test tones, acquiring the stimulus and response signals, and performing gain, phase, and distortion measurements. You must use a data acquisition device supported in DAQmx with at least one analog output and two analog inputs.
Tone Extraction	Finds the single tone with the highest amplitude or searches a frequency range you specify to find the single tone with the highest amplitude and returns the frequency, amplitude, and absolute phase for the detected tone. The step also can export Export signals to the Project View.
Tone Measurements	Performs common audio quality measurements when a pure tone is the expected signal. All measurements except DC and AC level are restricted to the specified frequency range. You also can remove DC signals from all measurements regardless of the specified frequency range. Distortion measurements allow you to quantify the linearity of the audio channel based only on the input signal and include THD and harmonics, THD+N, and SINAD. Channel evaluation measurements allow you to quantify the linear range of the audio channel based on the full-scale level and include gain, dynamic range, spurious-free dynamic range, noise level, and signal-to-noise ratio.
Zoom Power Spectrum	Computes the averaged zoom magnitude spectrum or zoom power spectrum. This measurement can return the spectrum in root-mean-square, peak, and peak-to-peak units. Data accumulates each time you pass new data. However, zoom analysis returns a new spectrum only when sufficient data accumulates.

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