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Measurement of frequency response functions using periodic excitations, corrupted by correlated input/output errors

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2 Author(s)
R. Pintelon ; Dept. ELEC, Vrije Univ. Brussel, Brussels, Belgium ; J. Schoukens

The frequency response function (FRF) of a system is often measured by taking the ratio of the output to the input Fourier coefficients of the steady-state response of the system to a periodic excitation. Generator noise, common noise disturbances picked up by the acquisition channels of the measurement device, and an external feedback loop, cause a correlation between the input/output errors of such an FRF measurement. This paper quantifies the bias error and the variance of the FRF measurement due to correlated input/output errors

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IEEE Transactions on Instrumentation and Measurement  (Volume:50 ,  Issue: 6 )