Abstract
The accuracy of respiratory impedance measurements by a previously described device is estimated. A theory for calculation of tube impedance is considered. The standard deviations of real, imaginary parts and module of tubal impedance are about 0.1 hPa/(l/s). The mean experimental values are in the range of theoretical curves for this kind of tube. Thus, the measurements are in a good agreement with theoretical calculations. When the impedance of the human respiratory system is measured, the mean individual standard deviations of real and imaginary parts of impedance are about 0.5 hPa/(l/s), which is equal to 20% of the real impedance. Causes of measurement deviations and ways of their decrease are also analyzed.
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