IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
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6 Instrumentation<br />
Required acoustic measurements<br />
Sound pressure levels<br />
One-third octave levels<br />
Narrowband spectra<br />
Can be met by different types of instruments<br />
Signal analyzer<br />
Laptop and software<br />
Handheld instruments, sound level meter<br />
Requirements<br />
Must met <strong>IEC</strong> Type 1 accuracy requirements and filters<br />
Frequency range<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
7