Measurement Computing Data Translation DT9857, User Manual

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Chapter 1
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Allows you to perform single-channel FFT (Fast Fourier Transform) operations,
including AutoSpectrum, Spectrum, and Power Spectral Density, on the acquired
analog input data. You can configure a number of parameters for the FFT, including
the FFT size, windowing type, averaging type, integration type, and so on.
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Allows you to display frequency-domain data as amplitude or phase.
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Supports dB or linear scaling with RMS (root mean squared), peak, and peak-to-peak
scaling options
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Supports linear or exponential averaging with RMS, vector, and peak hold averaging
options.
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Supports windowed time channels.
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Supports the following response window types: Hanning, Hamming, Bartlett,
Blackman, Blackman Harris, and Flat top.
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Supports the ability to lock the waveform output to the analysis frame time.
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Allows you to configure and view dynamic performance statistics, including the input
below full-scale (IBF), total harmonic distortion (THD), spurious free dynamic range
(SFDR), signal-to-noise and distortion ratio (SINAD), signal-to-noise ratio (SNR), and
the effective number of bits (ENOB), for selected time-domain channels in the Statistics
window.
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Supports digital IIR (infinite impulse response) filters.
• QuickDAQ Advanced FFT Analysis Option – When enabled with a purchased software
license, the QuickDAQ Advanced FFT Analysis option includes all the features of the
QuickDAQ Base version with the FFT Analysis option plus advanced FFT analysis
features, including the following:
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Allows you to designate a channel as a Reference or Response channel.
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Allows you to perform two-channel FFT analysis functions, including Frequency
Response Functions (Inertance, Mobility, Compliance, Apparent Mass, Impedance,
Dynamic Stiffness, or custom FRF) with H1, H2, or H3 estimator types,
Cross-Spectrum, Cross Power Spectral Density, Coherence, and Coherent Output
Power.
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Supports the Exponential response window type.
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Supports the following reference window types: Hanning, Hamming, Bartlett,
Blackman, Blackman Harris, FlatTop, Exponential, Force, and Cosine Taper windows.
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Supports real, imaginary, and Nyquist display functions.
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Allows you to save data in the .uff file format.
• Quick DataAcq application – The Quick DataAcq application provides a quick way to get
up and running using a DT9857 or DT9857E module. Using this application, you can
verify key features of the modules, display data on the screen, and save data to disk. (Note
that this application does not support configuring AC/DC coupling or the excitation
current source for IEPE inputs.)
• DT-Open Layers for .NET Class Library – Use this class library if you want to use Visual
C# or Visual Basic for .NET to develop your own application software for a DT9857 or
DT9857E modules using Visual Studio 2003-2012; the class library complies with the
DT-Open Layers standard.