Table of Contents

1 -  AS/NZS 3817:1998 ACOUSTICS-METHODS FOR THE DESCRIPTION AND PHYSICAL MEASUREMENT OF SINGLE IMPULSES OR SERIES OF IMPULSES
4 -  PREFACE
5 -  CONTENTS
7 -  1 Scope
7 -  2 Normative references
8 -  3 Definitions
8 -  3.1 Characteristics of an impulse noise
8 -  3.1.1 A-duration:
8 -  3.1.2 B-duration:
8 -  3.1.3 C-duration:
8 -  3.1.4 envelope:
8 -  3.1.5 impulse noise:
8 -  3.1.6 instantaneous sound pressure:
9 -  3.1.7 instantaneous sound pressure level:
9 -  3.1.8 peak sound pressure:
9 -  3.1.9 peak sound pressure level:
9 -  3.1.10 signal rise time:
9 -  3.1.11 sound energy:
10 -  3.1.12 sound energy level:
10 -  3.1.13 sound exposure:
10 -  3.1.14 sound exposure level:
10 -  3.2 Characteristics of the measurement system
10 -  3.2.1 bandwidth:
10 -  3.2.2 droop:
10 -  3.2.3 dynamic range:
10 -  3.2.4 overshoot:
10 -  3.2.5 slew-rate:
10 -  3.2.6 slew-rate limit:
11 -  3.2.7 system rise time:
11 -  4 Measurement system characteristics and requirements
11 -  4.1 General
11 -  4.2 Requirements for measurement of phase-sensitive quantities
11 -  4.2.1 System rise time
11 -  4.2.2 Overshoot
12 -  4.2.3 Droop
12 -  4.2.4 Dynamic range
12 -  4.2.5 Phase distortion and bandwidth
12 -  4.3 Requirements for measurement of time-integrated quantities
12 -  4.3.1 Dynamic range
12 -  4.3.2 Time-integration
12 -  4.3.2.1 Single time periods
12 -  4.3.2.2 Multiple time periods
12 -  4.3.3 Digital integration
13 -  4.3.4 Linearity range and resolution
13 -  4.3.5 Minimum bandwidth
13 -  4.3.6 Frequency weighting
13 -  4.3.7 Filters
13 -  4.4 Determination of measurement system characteristics
13 -  4.5 Instrumentation
13 -  4.5.1 Requirements
14 -  4.5.2 Microphone size and orientation
14 -  4.5.3 Windscreens
14 -  4.6 Calibration
15 -  5 Measurements
15 -  5.1 General
15 -  5.2 Measurement conditions
15 -  5.3 Procedures
15 -  5.3.1 Calibration
15 -  5.3.2 Integration time
15 -  5.4 Background noise
15 -  5.4.1 Time-integrated quantities
16 -  5.4.2 Phase-sensitive quantities
16 -  5.5 Uncertainty
16 -  6 Data presentation
16 -  6.1 Phase-sensitive quantities
16 -  6.1.1 General
17 -  6.1.2 Frequency description or weighting
17 -  6.2 Time-integrated quantities
17 -  6.2.1 Frequency description or weighting
17 -  6.2.2 Spectra
17 -  6.2.3 Measurement duration
17 -  6.3 General site and procedural information
17 -  6.3.1 Calibration
17 -  6.3.2 Meteorological conditions (outdoor measurements)
18 -  6.3.3 Site description
19 -  Annex A - Signal handling limitations in transient measurement and analysis
19 -  A.1 Slew-rate limit of amplifiers
20 -  A.2 Droop
20 -  A.3 Small signal bandwidth
21 -  Annex B - Methods for the large-amplitude impulse calibration of microphones
21 -  B.1 General
21 -  B.2 Description of the method
21 -  B.3 Implementation of hardware
23 -  B.4 Procedure
25 -  Annex C - Determination of measurement system characteristics
25 -  C.1 System rise time capability
25 -  C.2 Droop
25 -  C.3 Frequency response
25 -  C.4 Squaring and integrating functions
26 -  Annex D - Time-weighting characteristics and tolerances: S and F
27 -  Annex E - Bibliography

Abstract

Describes preferred methods for the description and the physical measurement of single impulsive sounds or short series of impulsive sounds and for the presentation of the data. It does not provide methods for interpreting the potential effects of series of impulses of noise on hearing, community response or structures. This Standard is identical with and has been reproduced from ISO 10843:1997.

Scope

This International Standard describes preferred methods for the description and the physical measurement of single impulsive sounds or short series of impulsive sounds and for the presentation of the data. It does not provide methods for interpreting the potential effects of series of impulses of noise on hearing, community response or structures.

This International Standard applies to single impulsive sounds or short series of impulsive sounds such as those produced by explosions, artillery fire, bombing and similar activities, sonic booms, pistol and rifle fire, and cartridge-operated tools or machines.

Two different kinds of measurements are considered:
a) measurements of phase-sensitive parameters, such as peak sound pressure level and duration, that directly characterize the variation of sound pressure with time; and
b) measurements of time-integrated quantities such as frequency-weighted sound exposure level or sound energy level.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Pending Revision indicates that as a result of the Aged Standards review process, the document needs updating. If no project proposal, meeting the quality criteria, is received within the 12 month timeframe, the document shall be withdrawn.
Pages
ISBN
Committee	EV-010
Supersedes	DR 95430