ELECTROACOUSTICS - INSTRUMENTS FOR THE MEASUREMENT OF SOUND INTENSITY - MEASUREMENT WITH PAIRS OF PRESSURE SENSING MICROPHONES
International Electrotechnical Committee
Cooperating organizations<br>National foreword<br>Foreword<br>Introduction<br>1. Scope<br>2. Normative references<br>3. Definitions<br>4. Grades of accuracy<br>5. Reference environmental conditions<br>6. Sound intensity processors: requirements<br>6.1 Frequency range<br>6.2 Filtering<br>6.3 A-weighting<br>6.4 Indicator accuracy<br>6.5 Provision for microphone separation<br>6.6 Presentation of results<br>6.7 Time averaging<br>6.8 Crest factor handling<br>6.9 Pressure-residual intensity index<br>6.10 Provision for phase compensation<br>6.11 Provision for range setting<br>6.12 Provision for overload indication<br>6.13 Provision for corrections for atmospheric pressure<br> and temperature<br>6.14 Operating environment<br>7. Sound intensity probes: requirements<br>7.1 Mechanical construction<br>7.2 Response to sound pressure<br>7.3 Response to sound intensity<br>7.4 Directional response characteristics<br>7.5 Performance in a standing wave field<br>7.6 Pressure-residual intensity index<br>7.7 Environmental conditions<br>8. Sound intensity instruments: requirements<br>9. Power supplies: requirements<br>10. Sound intensity probe calibrators: requirements<br>10.1 Sound pressure calibrators<br>10.2 Residual intensity testing devices<br>10.3 Sound intensity calibrators<br>11. Sound intensity processors: performance verification<br>11.1 Octave and one-third octave filters<br>11.2 Sound intensity indication<br>11.3 Time averaging<br>11.4 Crest factor handling<br>11.5 Pressure-residual intensity index and operating<br> range<br>12. Sound intensity probes: performance verification<br>12.1 Frequency response<br>12.2 Directional response<br>12.3 Performance in a standing wave field<br>12.4 Pressure-residual intensity index<br>13. Calibrators: performance verification<br>13.1 Sound pressure calibrators<br>13.2 Residual intensity testing devices<br>13.3 Sound intensity calibrators<br>14. Field calibration and checks<br>15. Marking and instruction manuals<br>15.1 Marking<br>15.2 Instruction manuals<br>Annexes<br>A. Periodic verification procedures<br>B. Sound intensity processors employing autoranging<br>C. Sound intensity processors based on DFT analysers<br> converting narrow bands to octave or on-third<br> octave<br>D. RC networks for generating known phase shifts<br>E. Dynamic capability index
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.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 29 |
