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ANSI S12.18 : 1994

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

PROCEDURES FOR OUTDOOR MEASUREMENT OF SOUND PRESSURE LEVEL
Available format(s)

Hardcopy , PDF

Superseded date

09-05-2023

Language(s)

English

Published date

01-01-2009

Foreword
0 Introduction
1 Scope, purpose and applications
2 References to other standards
3 Definitions
4 Environmental requirements
  4.1 General
  4.2 Factors influencing sound pressure level measurements
  4.3 Outdoor measurement of sound pressure level
  4.4 METHOD #1: General method for routine measurements
  4.5 METHOD #2: Precision method for accurate measurement
  4.6 Terrain equivalence
  4.7 Ground equivalence
5 Acoustical environment
  5.1 Types of measurements
  5.2 Classification of the sound source
6 Instruments for measuring sound pressure level outdoors
  6.1 Sound level meter/analyser
  6.2 Microphone
  6.3 Calibration
  6.4 Tape recorder
  6.5 Miscellaneous
  6.6 Configuration of measuring system
  6.7 Wind speed and direction
  6.8 Temperature sensor
7 Measurement
  7.1 Premeasurement planning
  7.2 Sound descriptor
  7.3 Source configuration and operation
  7.4 Duration or sample size
  7.5 Data collection
8 Data reduction
  8.1 Corrections
  8.2 Experimental error
9 Reporting
  9.1 Introductory information
  9.2 Site sketches
  9.3 Characterisation of the source
  9.4 Documentation of the instrumentation
  9.5 Meteorological data
  9.6 Acoustical data
  9.7 Other observations
Annex
A - Propagation of sound outdoors
    A.1 Geometrical divergence
    A.2 Atmospheric absorption
    A.3 Effects of the environment
    A.4 Miscellaneous attenuation
    A.5 Discussion

Describes procedures for the measurement of sound pressure levels in the outdoor environment, considering the effects of the ground, the effects of refraction due to wind and temperature gradients, and the effects due to turbulence.

Committee
S12
DocumentType
Standard
Pages
30
ProductNote
Reconfirmed 1994
PublisherName
Acoustical Society of America
Status
Superseded
SupersededBy

ISO 1996-2:2017 Acoustics — Description, measurement and assessment of environmental noise — Part 2: Determination of sound pressure levels
ANSI S1.4 : 1983 SPECIFICATION FOR SOUND LEVEL METERS
ANSI S1.11 : 2014 SPECIFICATION FOR OCTAVE-BAND AND FRACTIONAL-OCTAVE-BAND ANALOG AND DIGITAL FILTERS
ANSI S12.9 PT1 : 2013 QUANTITIES AND PROCEDURES FOR DESCRIPTION AND MEASUREMENT OF ENVIRONMENTAL SOUND - PART 1: BASIC QUANTITIES AND DEFINITIONS
ISO 1996-3:1987 Acoustics Description and measurement of environmental noise Part 3: Application to noise limits
ANSI/ASA S1.26 : 2014 METHOD FOR CALCULATION OF THE ABSORPTION OF SOUND BY THE ATMOSPHERE
ISO 1996-1:2016 Acoustics Description, measurement and assessment of environmental noise Part 1: Basic quantities and assessment procedures
IEC 60651:1979+AMD1:1993+AMD2:2000 CSV Sound level meters

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