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Sound and Vibration Toolkit

Measurements Features Express VIs Available Description
Calibration
  • End-to-end calibration of microphones and accelerometers
  • Propagation delay
 - Use the Calibration VIs to perform an end-to-end calibration of microphones, accelerometers, and general dynamic sensors. With the Calibration VIs, you can perform an end-to-end calibration on a selected channel and measure the propagation delay of the measurement device.
Display
  • Waterfall display
  • Colormap display
  • Octave graph
  • Magnitude/phase display
  • Cascade plot*
  • Bode plot*
  • Polar plot*
  • Orbit plot*
  • Timebase plot*
  • Shaft centerline plot*
 checkmark Use the Display VIs and indicators to configure and utilize the graphs and plots included to show acquired data and processed results.
Distortion
  • Total harmonic distortion (THD)
  • THD+N
  • Signal-to-noise-and-distortion (SINAD)
  • Intermodulation distortion (IMD)
  • Signal-to-noise ratio (SNR)
 checkmark Use the Distortion VIs to perform distortion analyses on a block of time-domain data. The SNR, SINAD, THD, and THD+N VIs return the complex spectrum and the measurement results. You can use these VIs sequentially to improve performance. With the Distortion VIs, you can measure harmonic distortion, intermodolation distortion, and phase nonlinearity in the device under test (DUT).
Envelope Analysis Envelope Detection* - Use Envelope Analysis VI to identify mechanical faults that have an amplitude-modulating effect on the vibration signal of a machine.
Frequency Analysis
  • Power spectrum
  • Fast Fourier transform (FFT)
  • Zoom FFT
  • Power spectral density
  • Frequency response
  • Coherence
  • Cross spectrum
  • Peak search
  • Power in band
 checkmark Use the Frequency Analysis VIs to perform baseband and zoom frequency analyses. Single-channel measurements include power spectrum, power spectral density, magnitude and phase spectra, and real and imaginary spectra. Apply these measurements on a single channel or multiple channels at the same time using the same Polymorphic VIs. Dual-channel measurements include cross spectrum, frequency response, and coherent output power. Compute frequency response measurements between a single stimuli and a single response, or multiple stimulus and multiple responses (MIMO), using the same Polymorphic VI. With extended measurement capabilities, you can perform additional measurements such as peak detection, power in band, unit conversion, and limit testing.
Generation
  • Continuous tone
  • Continuous dual tone
  • Multitone
  • Frequency flat chirp
  • White noise
  • Pink noise
  • Swept sine with custom amplitude
 checkmark Use the Generation VIs to generate test signals for sound and vibration measurements. The Pink Noise Waveform VI helps you generate a continuous pink noise waveform.
Integration
  • Convert acceleration to velocity
  • Convert acceleration to displacement
 - Use the Integration VI to perform time-domain integration to convert acceleration data to velocity data (single integration), acceleration data to displacement data (double integration), and velocity data to displacement data.
Limit Testing
  • Mask testing
  • High (max.), low (min.), both high/low limits
 checkmark Use the Limit Testing VI to perform range detection and mask testing on time-domain data, frequency spectra, XY data such as octave spectra, peaks, and scalar measurement results.
Octave Analysis
  • IEC full, 1/3, 1/6, 1/12, and 1/24 octave
  • ANSI full, 1/3, 1/6, 1/12, and 1/24 octave
 checkmark Use the Octave Analysis VIs to perform octave, 1/3-octave, and 1/n-octave measurements. You can also perform extended measurements such as weighting and limit testing. The Octave Analysis VIs offer a complete set of tools to perform fractional-octave analysis, including full, 1/3, 1/6, 1/12, and 1/24 octave-band analysis. The Octave Analysis VIs can accommodate any sampling frequency and any number of fractional-octave bands.
Order Analysis
  • Gabor transform (off-line)*
  • Resampling (online)*
  • Order power spectrum*
  • Order waveform, magnitude, and phase*
 checkmark Use the Order Analysis VIs to calculate order-related results such as order map, order magnitude and phase, order spectrum, and order waveform.
Single-Tone
  • Phase mismatch
  • Phase linearity
  • Group delay
  • Gain
  • Dynamic range
  • Spurious-free dynamic range (SFDR)
  • Idle channel noise
  • Crosstalk/separation
 checkmark The Single-Tone VIs help you perform single-tone measurements, defined as a group of measurements where the excitation is a single tone. You can measure gain and phase, crosstalk, dynamic range, idle channel noise, and SFDR. Each VI returns the complex spectrum and the measurement results. You can use these VIs sequentially to improve performance. Engineers often use these analyses to measure the linear response and noise performance of the DUT.
Scaling
  • Voltage to engineering units
  • dB reference
 - Use the Scaling VI to scale time-domain data to engineering units. The Scaling VI operates on voltage channels not previously scaled in Measurement & Automation Explorer.
Slow-Roll Compensation Slow-roll compensation* - Use the OAT Get Vector Reference VI to extract the vector reference signal. Use the OAT Get Even Angle Reference VI to extract the even-angle reference signal from the slow-roll vibration and tachometer signal. Use the OAT Compensate Vector Signal VI to remove the slow-roll errors in the vector signal. Use the OAT Compensate Even Angle Signal VI to remove the slow-roll errors from the even-angle signal.
Sound Level Leq, exponential, peak sound level checkmark Use the Sound Level VIs to perform sound-level measurements and return level results in decibels. The Sound Level VIs offer typical sound-level measurements, including equivalent continuous averaging (Leq), exponential averaging, and peak hold.
Swept Sine
  • Frequency response - gain and phase
  • RMS levels
  • THD
  • Nyquist and bode plot
  • Individual harmonics
 checkmark Use the Swept Sine VIs to perform swept-sine measurements. You can configure the acquisition hardware and perform measurements such as stimulus RMS level, response RMS level, magnitude and phase response, total harmonic distortion, and individual harmonic distortion. Swept-sine analysis is typically used to characterize the frequency response of a DUT.
Tachometer Signal Processing Analog and digital tachometer signal processing* checkmark Use the Tachometer Signal Processing VIs to process analog and digital tachometer signals.
Transient Analysis
  • Short-time Fourier transform (STFT)
  • Shock response spectrum (SRS)
  • Tachometer-to-rpm conversion
 - The Transient Analysis VIs offer two techniques for obtaining information about transient signals. Use the STFT to extract frequency information as a function of time or rotational speed. Use the SRS to evaluate the severity of a shock signal.
Vibration Level RMS, exponential, peak, crest factor checkmark Use the Vibration Level VIs to perform vibration-level measurements and return level results with a linear scale. The Vibration Level VIs offer level measurements typically used for vibration measurements, such as crest factor measurements. Averaging modes include RMS averaging, exponential averaging, and peak hold.
Weighting
  • A, B, C weighting
  • ITU-R 468-4
  • Dolby
  • CCITT
  • C-Message
- Use the Weighting VIs to perform frequency weighting on time-domain data. With the Weighting VIs, you can apply A-, B-, or C-weighting filters on the time-domain signal. Additionally, ITU-R 468-4 and Dolby filters are available for radio-communications applications, and C-message and CCITT filters are available for telecommunications applications.

*Note: These functions are included only with the Sound and Vibration Measurement Suite.

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