IEC 61043 : 1.0

ELECTROACOUSTICS - INSTRUMENTS FOR THE MEASUREMENT OF SOUND INTENSITY - MEASUREMENT WITH PAIRS OF PRESSURE SENSING MICROPHONES

International Electrotechnical Committee

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Cooperating organizations National foreword Foreword Introduction 1. Scope 2. Normative references 3. Definitions 4. Grades of accuracy 5. Reference environmental conditions 6. Sound intensity processors: requirements 6.1 Frequency range 6.2 Filtering 6.3 A-weighting 6.4 Indicator accuracy 6.5 Provision for microphone separation 6.6 Presentation of results 6.7 Time averaging 6.8 Crest factor handling 6.9 Pressure-residual intensity index 6.10 Provision for phase compensation 6.11 Provision for range setting 6.12 Provision for overload indication 6.13 Provision for corrections for atmospheric pressure       and temperature 6.14 Operating environment 7. Sound intensity probes: requirements 7.1 Mechanical construction 7.2 Response to sound pressure 7.3 Response to sound intensity 7.4 Directional response characteristics 7.5 Performance in a standing wave field 7.6 Pressure-residual intensity index 7.7 Environmental conditions 8. Sound intensity instruments: requirements 9. Power supplies: requirements 10. Sound intensity probe calibrators: requirements 10.1 Sound pressure calibrators 10.2 Residual intensity testing devices 10.3 Sound intensity calibrators 11. Sound intensity processors: performance verification 11.1 Octave and one-third octave filters 11.2 Sound intensity indication 11.3 Time averaging 11.4 Crest factor handling 11.5 Pressure-residual intensity index and operating       range 12. Sound intensity probes: performance verification 12.1 Frequency response 12.2 Directional response 12.3 Performance in a standing wave field 12.4 Pressure-residual intensity index 13. Calibrators: performance verification 13.1 Sound pressure calibrators 13.2 Residual intensity testing devices 13.3 Sound intensity calibrators 14. Field calibration and checks 15. Marking and instruction manuals 15.1 Marking 15.2 Instruction manuals Annexes A. Periodic verification procedures B. Sound intensity processors employing autoranging C. Sound intensity processors based on DFT analysers       converting narrow bands to octave or on-third       octave D. RC networks for generating known phase shifts E. Dynamic capability index

Abstract

Applies to instruments which detect sound intensity by pairs of spatially separated pressure sensing microphones and specifies performance requirements for instruments used for the measurement of sound intensity, and their associated calibrators. The purpose of this standard is to ensure the accuracy of measurements of sound intensity applied to the determination of sound power in accordance with ISO 9614.