Title :
Effect of the finite memory length of a recorder in evaluating its frequency response of from step response
Author_Institution :
Dipt. di Ingegneria Elettrica, Universita degli Studi di Padova, Italy
fDate :
6/24/1905 12:00:00 AM
Abstract :
The length of the record containing the step response of a system affects the estimate of the frequency response obtained from it by the DFT algorithms. An evaluation of the error due to the record truncation is presented in a theoretical case. The amplitude of this error is particular significant when small aberration (of the order of few percentage) of the response is considered. A criterion of obtaining the frequency response of a system based on two or more records of the step response acquired with different sampling frequencies is presented. The quantification of the errors in this estimate is discussed, in particular for the low frequency sampled records. The presented method is applied to experimental data to estimate the frequency response of an oscilloscope.
Keywords :
frequency response; measurement errors; oscilloscopes; recorders; signal sampling; step response; waveform analysis; DFT algorithms; aliasing; error amplitude; error quantification; frequency response evaluation; low frequency sampled records; oscilloscope; record truncation; recorder finite memory length; step like waveform; step response; time-limited record; Discrete Fourier transforms; Finite wordlength effects; Frequency domain analysis; Frequency estimation; Frequency response; Oscilloscopes; Quantization; Sampling methods; Signal resolution; Uncertainty;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE
Print_ISBN :
0-7803-7218-2
DOI :
10.1109/IMTC.2002.1006942
