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 />
A-weighted sound pressure level<br />
At least 30 1-minute averaged measurements with wind speed<br />
when the turbine is operating (AWEA mod:10-sec)<br />
At least 3 measurements per wind speed bin. (For statistical<br />
purposes/good practice if using 10-second averages then 10<br />
points per wind speed bin)<br />
At least 30 minutes of background (turbine not operating)<br />
covering the same as turbine measurements<br />
A-weighted one-third octave levels<br />
At least 3 spectra measured over 1-minute for each integer<br />
wind speed and covering centre frequencies of 50Hz-10kHz<br />
(same as above modify for 10-second averages)<br />
Background covers the same requirements<br />
A-weighted narrowband<br />
At least 2 minutes closest to the integer wind speed<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
16
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