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eLibrary > BS EN IEC 61265:2018 - TC Tracked Changes. Electroacoustics. Instruments for measurement of aircraft noise. Performance requirements for systems to measure sound pressure levels in noise certification of aircraft >

BS EN IEC 61265:2018 - TC Tracked Changes. Electroacoustics. Instruments for measurement of aircraft noise. Performance requirements for systems to measure sound pressure levels in noise certification of aircraft, 2020

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BS EN IEC 61265:2018 - TC Tracked Changes. Electroacoustics. Instruments for measurement of aircraft noise. Performance requirements for systems to measure sound pressure levels in noise certification of aircraft, 2020

30343466_New.pdf [Go to Page]
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English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Purpose
Table 1 – ICAO measurement protocols (informative)
5 Requirements [Go to Page]
5.1 General [Go to Page]
5.1.1 Output data
5.1.2 Time-pressure history
5.1.3 Measurements of sound from aircraft ground power units
5.1.4 Measurements of aircraft operations on the ground
5.2 Measurement uncertainty [Go to Page]
5.2.1 Relationship with regulatory requirements
5.2.2 Performance verification
5.2.3 Periodic tests
5.3 Reference environmental conditions
5.4 Sound calibrator
5.5 Microphone system [Go to Page]
5.5.1 Pressure and free-field type microphones
5.5.2 Grazing incidence microphone configuration
5.5.3 Ground plane microphone configuration
Figure 1 – Illustration of sound incidence anglesfrom the principal axis of the microphone
Table 2 – Maximum difference between the free-field sensitivity level of a microphoneused in grazing-incidence microphone configuration at normal incidence andat specified sound incidence angles [Go to Page]
[Go to Page]
5.5.4 Measurement configurations
5.6 Measurement system exclusive of the microphone [Go to Page]
5.6.1 Frequency response
5.6.2 Level linearity
5.6.3 Floating-range measurement systems
5.7 Spectrum analysis system [Go to Page]
5.7.1 Third-octave analysis
5.7.2 Time constants
5.7.3 Time offset
5.7.4 Anti-aliasing
5.8 Readout device resolution
5.9 Sensitivity to various environments [Go to Page]
5.9.1 General
5.9.2 Atmospheric pressure
5.9.3 Air temperature
5.9.4 Humidity
5.9.5 Electromagnetic compatibility
Annex A (informative)Methods of testing the electroacoustical performanceof a measurement system [Go to Page]
A.1 General
A.2 Operating conditions for test
A.3 Sound calibrator
A.4 Microphone system frequency response
A.5 Frequency response of the measurement system exclusive of the microphone
A.6 Linear operating range of the measurement system exclusive of the microphone
A.7 Spectrum analysis system
Annex B (informative)Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement
Figure B.1 – Relationship between tolerance interval, corresponding acceptanceinterval and the maximum permitted uncertainty of measurement
Bibliography [Go to Page]

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BS EN IEC 61265:2018 - TC Tracked Changes. Electroacoustics. Instruments for measurement of aircraft noise. Performance requirements for systems to measure sound pressure levels in noise certification of aircraft, 2020

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