DSA 2.9 supports a wide variety of National Instruments data acquisition hardware and will automatically detect and configure for each supported device it finds. An intuitive interface unique to each device provides all user settings including sample rate, calibration, channel naming, coupling and gain settings where appropriate.
Use DSA 2.9 to compute frequency and order domain spectra. Build spectrum overlays, toggle waveforms on/off for clarity, re-size your display, export to text or graphics files, and observe a dynamic replay of your recording by interactively slewing the file position slider. In addition to power spectra, you can compute frequency response function magnitude, phase, coherence and coherent output power. Hanning and flattop windows are available as are linear and exponential averaging, pre-filtering and A-weighting for acoustic signals. Linear, power and PSD unit scaling is available, and advanced cursor functions provide band power computations as well as single- and double-sided harmonic series and machine-specific cursors for bearing, belts, gears, etc.
View dynamic signals in time/frequency domain to explore harmonic interaction with resonance, identify impulsive events, and extract and analyze discrete orders vs time or speed. A graphical cursor keyed to a shaft speed is a reference mask for order selection. DSA 2.9 uses NI’s patented Gabor order extraction method to interactively select and reconstruct harmonically related energy in the time domain. Use the mouse to drag the mask over important areas of the time/frequency graph, adjust the mask width to encompass related energy and click to instantly extract orders. Build a list of orders of interest and graphically compare harmonics across channels and build overlays across multiple files.
The dynamic response to a short duration impulse can be used to define the frequency response function (FRF) of a structure. DSA 2.9 supports the impact method where an instrumented hammer is used to impart measured force while transducers such as accelerometers are used to measure the response. You can acquire FRF’s from all response channels simultaneously and view Mag/Phase/Re/Im or Coherence. A preview window is offered to allow supervised accept/reject of each impact measurement. The software also provides for automated export to text or universal (uff 58) files. The latter can include full project header info for direct import into universal file compatible applications.
Compute spectra in nth octave bands from 1/1 to 1/24th octave using linear or exponential averaging with fast, slow, impulse and custom weighting.
For microphone measurements, Zwicker stationary loudness can be computed along with the specific loudness function.
DSA 2.9 supports two sample rates so you can assign support signals such as temperature, flow strain, etc. to a slower sample rate device in your setup while also utilizing appropriate high speed sampling devices for dynamic inputs like microphones and accelerometers.