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Effect of the finite memory length of a recorder in evaluating its frequency response of from step response

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1 Author(s)
Fiorentin, P. ; Dipt. di Ingegneria Elettrica, Universita degli Studi di Padova, Italy

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.

Published in:
Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE  (Volume:1 )

Date of Conference: 2002

Page(s):
787 - 791 vol.1
ISSN :
1091-5281
Print ISBN:
0-7803-7218-2
INSPEC Accession Number:
7403304
Digital Object Identifier :
10.1109/IMTC.2002.1006942
Product Type:
Conference Publications

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