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BS EN IEC 60942:2018 Electroacoustics. Sound calibrators, 2018
- undefined
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Reference environmental conditions
- 5 Requirements [Go to Page]
- 5.1 General
- Tables [Go to Page]
- Table 1 – Sound calibrator classes and designations
- 5.2 Adaptors
- 5.3 Sound pressure level [Go to Page]
- 5.3.1 General
- 5.3.2 Generated sound pressure level
- 5.3.3 Short-term level fluctuation
- 5.3.4 Sound pressure level over range of supply voltage
- 5.4 Frequency [Go to Page]
- 5.4.1 General
- 5.4.2 Frequency of sound generated by the sound calibrator
- Table 2 – Acceptance limits for sound pressure level and short-term level fluctuation, at and around reference environmental conditions
- Table 3 – Acceptance limits for the effect of supply voltage on sound pressure level, under reference environmental conditions
- 5.5 Influence of static pressure, air temperature and humidity
- Table 4 – Acceptance limits for frequency, at and around reference environmental conditions
- 5.6 Total distortion + noise
- Table 5 – Acceptance limits for sound pressure level, over the specified range of environmental conditions
- Table 6 – Acceptance limits for frequency, over the specified range of environmental conditions
- 5.7 Power supply requirements
- 5.8 Specification and calibration of microphones [Go to Page]
- 5.8.1 Microphone models and adaptors
- 5.8.2 Microphone sensitivity level
- Table 7 – Maximum total distortion + noise
- 5.9 Electromagnetic compatibility [Go to Page]
- 5.9.1 General
- 5.9.2 Radio-frequency emissions
- 5.9.3 Electrostatic discharges
- 5.9.4 Immunity to power- and radio-frequency fields
- 6 Instrument marking and documentation [Go to Page]
- 6.1 Marking of the sound calibrator
- 6.2 Individual calibration chart for a class LS sound calibrator
- 6.3 Instruction manual
- Annexes [Go to Page]
- Annex A (normative) Pattern evaluation tests [Go to Page]
- A.1 General
- A.2 Submission for test
- A.3 Principal values
- A.4 Marking of the sound calibrator and supplied documentation
- A.5 Performance tests at and around reference environmental conditions [Go to Page]
- A.5.1 General
- A.5.2 Orientation
- A.5.3 Ambient noise
- A.5.4 Microphone specification
- A.5.5 Sound pressure level
- A.5.6 Sound pressure level stability – Short-term level fluctuation
- A.5.7 Frequency
- Table A.1 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 %, for sound pressure level and short-term level fluctuation at and around reference environmental conditions [Go to Page]
- [Go to Page]
- A.5.8 Total distortion + noise
- Table A.2 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 % for frequency, at and around reference environmental conditions [Go to Page]
- A.6 Environmental tests [Go to Page]
- A.6.1 General
- A.6.2 Influence of static pressure
- Table A.3 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 % for total distortion + noise, over the appropriate range of environmental conditions [Go to Page]
- [Go to Page]
- A.6.3 Acclimatization requirements for tests of the influence of variations in air temperature and relative humidity
- A.6.4 Abbreviated test of influence of air temperature and humidity combined
- Table A.4 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 %, for sound pressure level, over the specified range of environmental conditions [Go to Page]
- [Go to Page]
- A.6.5 Influence of air temperature
- Table A.5 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 % for frequency, over the specified range of environmental conditions [Go to Page]
- [Go to Page]
- A.6.6 Influence of relative humidity
- A.6.7 Influence of air temperature and humidity combined
- A.7 Electromagnetic compatibility [Go to Page]
- A.7.1 General
- A.7.2 Radio-frequency emissions
- A.7.3 Electrostatic discharges
- A.7.4 Immunity to power- and radio-frequency fields
- Annex B (normative) Periodic tests [Go to Page]
- B.1 General
- B.2 Submission for test
- B.3 Preliminary inspection
- B.4 Performance tests [Go to Page]
- B.4.1 Orientation
- B.4.2 Ambient noise
- B.4.3 Environmental conditions
- B.4.4 Additional equipment
- B.4.5 Microphone specification
- B.4.6 Sound pressure level
- B.4.7 Frequency
- B.4.8 Total distortion + noise
- B.5 Calibration of the sound calibrator with other models of microphone
- B.6 Documentation
- Annex C (normative) Pattern evaluation report [Go to Page]
- C.1 General
- C.2 Marking
- C.3 Submission for test
- C.4 Pattern evaluation report content
- Annex D (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
- Figures [Go to Page]
- Figure D.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
- Annex E (informative) Example assessments of conformance to specifications of this document [Go to Page]
- E.1 General
- E.2 Conformance criteria
- E.3 Example test results
- Table E.1 – Examples of assessment of conformance
- Figure E.1 – Examples of assessment of conformance
- Bibliography [Go to Page]
