Technical Articles and Resource Materials
in Digital Data Acquisition and Analysis

recommended reading for students in TTi courses
194, 196 and 197-5

Demonstration Programs and Tools

The Demonstration programs and calculators used by Strether Smith in his TTi courses are available for download, free of charge. Register here for a password.
Log in here if you already have your user name and password.

  • Aliasing Demonstration
    • Demonstrates principles of aliasing, spectral folding, and the reduction of aliasing errors with an analog low-pass (anti-alias) filter.
  • AC-Coupling Demonstration
    • Demonstrates the effect of AC-Coupling a sine and square signal with and without offset. Updated July 2008
  • Convolution Demonstration
    • Demonstrates the Convolution Process. Updated April 2008
  • Closed-Loop Control Demonstration
    • Demonstrates the effects of signal frequency and gain on closed-loop-control. NEW Aug. 2008
  • Digitizing Error Demonstration
    • Demonstrates the effect of digitization of data. Updated July 2008 (Frequency analysis added)
  • Fourier Transform Demonstration
    • Demonstrates the calculations and the resulting filter shape of a single Fourier-Transform filter at 10 waves/buffer.
  • Interpolation Demonstration
    • Demonstrates the use of interpolation/resampling on a tachometer pulse acquired at 100,000 samples/second. The program reconstructs the time history by calculating the number of points requested between the original (acquired) values.
  • Leakage Demonstration
    • Demonstrates leakage of the Fourier-Transform filtering operation and the effect of applying several windows to the input time history. Updated Nov. 2007
  • Non-Linearity Demonstration (formerly Distortion Demonstration)
    • Demonstrates the effects of several types of non-linearity on the time history and spectrum of a sine wave. Updated July 2008
  • Polynomial Fit Demonstration
    • Demonstrates the fitting of data sets (including calibrations) with Polynomial Curves. Updated July 2008
  • Pulse-Alias Demonstration
    • Demonstrates the effect of undersampling (violating Shannon's rule) on a Pulse Time History. NEW Nov. 2007
  • Running-Average Filter Demonstration
    • Demonstrates the effect on the time history and spectrum of a running-average (convolution) filter. NEW August, 2008
  • Shock-Alias Demonstration
    • Demonstrates the effect of undersampling (violating Shannon's rule) on a broadband Pyroshock Time History. Updated Nov. 2009
  • Shock Filter Effects Demonstration
    • Demonstrates the effect of low-pass filtering on a high-frequency shock time history and the need for large headroom for shock and other tests that have significant “out-of-band” response.
  • Shock Saturation & Correction Demonstration
    • Demonstrates the effect of saturation of signal and slew rate of out-of-band energy on a high-frequency shock time history and the need for large headroom for shock and other tests that have significant “out-of-band” frequency response. NEW Nov. 2009
  • Sigma Delta ADC Demonstration
      Demonstrates the Sigma-Delta Analog-to-Digital Converter process.
  • Signal-Sound Demonstration
    • Demonstrates audibly and graphically (in time and spectral form) a variety of waveforms. Updated Nov. 2007
  • Spectral Plot Format Demonstration
    • Demonstrates the effect of selecting linear or logarithmic frequency scales and linear, logarithmic, or dB magnitude scales on spectral plots. NEW Nov. 2007
  • Square Wave Fourier and Butterworth Filter Demonstration
    • Demonstrates the effect of several “perfect” low-pass filters on a square wave.
TOOLS
  • dB Calculator
    • Calculates magnitude ratios and their equivalent decibels.
  • DOF-Chi2 Calculator
    • Calculates a table of Gaussian-random-calculation reliability as a function of Confidence and Degrees of Freedom.
  • Filter & Alias Analyzer
    • Provides a general alias-protection analysis for a variety of popular analog low-pass filters. Updated Nov. 2009
  • Power Spectral Density Calculator
    • A general-purpose Power Spectral Density Design and Calculation Tool. New July 2008
  • Sine Sweep System Characterization Program
    • Characterizes the in-band-frequency behavior of a data acquisition system. Updated Nov. 2009

Technical Articles

Reference Material

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