ECNWind Energy is accredited according ISO 17025 to perform power performance
measurements of wind turbines following IEC 61400-12 and Measnet. The
typical results of these measurements are measured power curves of the
wind turbines. These curves show the electrical power versus the wind
speed. Part of the power performance analysis is the uncertainty analysis.
In power performance measurements according IEC 61400-12
or Measnet, the wind speed is measured using cup anemometers. The uncertainty
of the wind speed measurements depends among others on the calibration
uncertainty. The cup-anemometer calibration uncertainty is divided in
Type A and Type B uncertainty. The Type A uncertainty is the statistical
uncertainty of the wind speed measurement and can be calculated from
the wind speed measurements. The Type B uncertainty includes all uncertainties
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