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
The Demonstration programs and calculators used by Strether Smith in his TTi courses are now 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. NEW 11/5/07
- Convolution Demonstration
- Demonstrates the Convolution Process. Updated 11/5/07
- dB Calculator
- Calculates magnitude ratios and their equivalent decibels.
- Digitizing Error Demonstration
- Demonstrates the effect of digitization of data. New 11/5/07
- Distortion Demonstration
- Demonstrates the effects of several types of non-linearity on the time history and spectrum of a sine wave.
- 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 11/5/07
- 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 11/5/07
- Polynomial Fit Demonstration
- Demonstrates the fitting of data sets (including calibrations) with Polynomial Curves.
- Pulse-Alias Demonstration
- Demonstrates the effect of undersampling (violating Shannon’s rule) on a Pulse Time History. NEW 11/5/07
- Shock-Alias Demonstration
- Demonstrates the effect of undersampling (violating Shannon’s rule) on a broadband Pyroshock Time History. NEW 11/5/07
- 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.
- 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 11/5/07
- 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 11/5/07
- Square Wave Fourier and Butterworth Filter Demonstration
- Demonstrates the effect of several “perfect” low-pass filters on a square wave.
Technical Articles
- Articles by TTi instructor Strether Smith
- "PC-Based Digital Data Acquisition and Analysis System"
- A Close Look at the Measurement of Shock Data—Lessons Learned
- A Commentary of the State of Engineering Education (Editorial)
- Commercial-Off-The-Shelf (COTS) Software Systems for Data Acquisition and Analysis... Love Affairs and Land Mines (Editorial)
- The COTS Software Issue Revisited/The Power Of Positive Complaining (Editorial)
- The Data Acquisition Time Bomb (Editorial)
- Developments in Digital Data Acquisition/Analysis System Technology for Large-Scale, Structural-Dynamic Testing Facilities
- Getting What You Want (Editorial)
- The Interpolation of Sparse Time History Data
- A Proposed Method to Standardize Shock Response Spectrum (SRS) Analysis
- Recent Advances in Digital Data Acquisition Technology for Structural-Dynamic Testing
- Techniques for the Normalization of Shock Data
- Test Data Anomalies—When Tweaking’s OK
- Why Shock Measurements Performed at Different Facilities Don’t Agree
- Measure Any Parameter with a Single Platform (by Arik Ariav; be sure to read the comments following this article)
- Questions to Ask Before Choosing a DAQ Board
Reference Material
- Fundamentals of Signal Analysis
Agilent's classic application note on Signal Analysis - Digital Filter Design
© Technology Training, Inc. 2007
BJA 071115
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