EN 61043:1994

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
Annex ZA (normative) Other international publications
quoted in this standard with the references of the
relevant European publications
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

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. To meet the requirements of that standard, instruments are required to analyse the sound intensity in one-third octave or octave bands, and optionally to provide A-weighted band levels.