Abstract

Recent calibrations of the Bendix Q15R ducted impeller current meter show a strong nonlinear relationship between the observed count rate conversion factor and the true water speed in the range 0.0-0.1 m/s. An empirical response curve is fitted (using least squares) to the data and the fitted coefficients are presented for all current meters calibrated by Argonne National Laboratory. Separate calibrations of every current meter are recommended wherever possible. If this is not possible, use of the composite fitted curve is recommended in preference to the manufacturer's conversion factor.

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