IEC Acoustic Standard IEC 61400-11

Recommendations

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6 Instrumentation Anemometers End to end deviation of ±0.2m/s in range of 4-12m/s Capable of synchronizing with acoustic data Power transducer Meet IEC 60688, same as power performance Wind direction Accuracy of ±6 o Camera Distance measurement Pressure Accuracy of ±1kPa Temperature Accuracy of ±1 o C NATIONAL RENEWABLE ENERGY LABORATORY 10
6 Instrumentation Traceable Calibration Acoustic calibrator 12 mo Microphone 24 mo Integrating sound level meter 24 mo Spectrum analyzer 36 mo Data recording/playback system 24 mo Anemometer 24 mo Power transducer 24 mo Exceptions Recalibrate after repair, damage, or suspect NATIONAL RENEWABLE ENERGY LABORATORY 11
Page 1 and 2: Part I Acoustic Testing Stepping Th
Page 3 and 4: 1 Scope General description and pur
Page 5 and 6: 3 Definitions and 4 Symbols and Uni
Page 7 and 8: 6 Instrumentation Required acoustic
Page 9: 6 Instrumentation Acoustical calibr
Page 13 and 14: 7 Measurements and Measurement Posi
Page 19 and 20: 8 Data Reduction Procedures Wind sp
Page 21 and 22: 8 Data Reduction Procedures Apparen
Page 23 and 24: Look at NoiseLab Setup Calibration
Page 25 and 26: Filtering for Valid Data - Listen f
Page 27 and 28: Binning and Averaging After binning
Page 29 and 30: Background Correction Calculate the
Page 31 and 32: NATIONAL RENEWABLE ENERGY LABORATOR
Page 33 and 34: One-Third Octave Levels Sound press
Page 35 and 36: Tonality To begin - Two minutes of
Page 37 and 38: Determine Critical Bandwidth Calcul
Page 39 and 40: Classify ‘Masking’ A line is cl
Page 41 and 42: Determination of Tone Level The sou
Page 43 and 44: Determination of Masking Level Calc
Page 45 and 46: Determination of Tonality The diffe
Page 47: Tonality can be complicated and the

IEC Acoustic Standard IEC 61400-11

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