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A Portable Data Acquisition/Statistical Analysis System for Measuring Vehicle RFI Characteristics
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English
Abstract
A new microcomputer-based statistical measurement system can accurately acquire vehicular ignition generated RFI impulse noise data and quickly reduce it to tabular and plotted outputs of the distributions of amplitudes and of periods between occurrences of a particular amplitude. This user-interactive system obtains distributions generated by all cylinders or, by synchronous electronic gating using a fractional-cylinder window, obtains distributions generated by any portion of any isolated cylinder. It permits quick and effective testing of proposed designs and design changes during the development process. This paper presents system description, system proveout and system application results.
Authors
Citation
Cummins, D., "A Portable Data Acquisition/Statistical Analysis System for Measuring Vehicle RFI Characteristics," SAE Technical Paper 831013, 1983, https://doi.org/10.4271/831013.Also In
References
- SAE Recommended Practice J551, 8th revision June 1981 “Performance Levels and Methods of Measurement of Electromagnetic Radiation From Vehicles and Devices (20-1000 mHz).”
- Oranc H. S. “Ignition Noise Measurements in the VHF/UHF Bands” IEEE Transactions on Electromagnetic Compatibility May 1975
- Wood P. H. “A Synchronous Gate Pulse Generator for Use in Automotive Ignition Systems Radio Frequency Interference Studies” General Motors Research Publication GMR-1433 July 24 1973
- Maxam G. L. Hsu H. P. Schlick D. C. Storwick R. M. “Measured Pulse Height Distributions of Individual Engine Cylinder Ignition Noise” General Motors Research Publication GMF-1424 July 25 1973
- Shepherd R. A. “Measurements of Amplitude Probability Distributions and Power of Automobile Ignition Noise at RF” IEEE Transactions on Vehicular Technology October 1974
- Johnson W. J. Piper H. A. Amey J. E. “Radiated Noise Due to Individual Spark Events in an Internal Combustion Engine” Ford Technical Report SR-77-16 March 7 1977