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Publication Citation: Nonrandom Quantization Errors in Timebases

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Author(s): Gerard N. Stenbakken; D. Liu; J. A. Starzyk; Bryan C. Waltrip;
Title: Nonrandom Quantization Errors in Timebases
Published: May 01, 2000
Abstract: Timebase distortion causes nonlinear distortion of waveforms measured by sampling instruments. When such instruments are used to measure the rms amplitude of the sampled waveforms, such distortions result in errors in the measured rms values. This paper looks at the nature of the errors that result from nonrandom quantization errors in an instrument's timebase circuit. Simulations and measurements on a sampling voltmeter show that the errors in measured rms amplitude have a non-normal probability distribution, such that the probability of large errors is much greater than would be expected from the usual quantization noise model. A novel timebase compensation method is proposed which makes the measured rms errors normally distributed and reduces their standard deviation by a factor of 25. This compensation method was applied to a sampling voltmeter and the improved accuracy was realized.
Proceedings: Proc. IEEE Instrumentation and Technology Conference (IMTC)
Volume: 1
Pages: pp. 235 - 240
Location: Baltimore, MD
Dates: May 1-4, 2000
Keywords: correction algorithm;error analysis;quantization;sampling;timebase;voltmeter;
Research Areas: Energy Conversion, Storage, and Transport
PDF version: PDF Document Click here to retrieve PDF version of paper (4MB)