• 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