IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
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7 Measurements and Measurement Positions<br />
Non-acoustic measurements: wind direction<br />
Wind direction measurements must be within 15 degrees of<br />
nacelle azimuth position with respect to upwind<br />
Arithmetically averaged over the same period as acoustic<br />
measurements<br />
Non-acoustic measurements: Other<br />
Air temperature and pressure measured and recorded at<br />
least every 2 hours<br />
Optionally turbulence as discussed in Annex C<br />
Rotor speed and pitch angle are recommended<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
18
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