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ANSI S12.68 : 2007 : R2012

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

METHODS OF ESTIMATING EFFECTIVE A-WEIGHTED SOUND PRESSURE LEVELS WHEN HEARING PROTECTORS ARE WORN
Available format(s)

Hardcopy , PDF

Superseded date

13-07-2019

Language(s)

English

Published date

01-01-2017

1 Scope and Applications
2 Normative references
3 Terms and definitions
4 Measurement of Sound Attenuation of Hearing
  Protectors
5 Noise Level Reduction Statistic for Use with
  A-Weighting (NRS[A])
6 Noise Level Reduction Statistic, Graphical
  (NRS[G])
7 Octave-Band Method
Annex A (normative) - Noise Spectra Used in
        Calculating the NRS[A] and NRS[G]
Annex B (informative) - Spreadsheet Illustrating
        Calculation and Use of the NRS[A] and
        NRS[G]
Annex C (informative) - Example of the Calculation
        of the Assumed Protection Values and
        the Use of the Octave-Band Method
Annex D (informative) - Calculation of the
        Confidence Interval for the NRS[A80]
Bibliography

Defines a choice of three methods for use with hearing protector attenuation data to estimate the effective A-weighted sound pressure levels when a hearing protector is worn.

Committee
S12
DevelopmentNote
Includes Program file (ZIP format). (07/2009)
DocumentType
Standard
Pages
42
ProductNote
Reconfirmed 2012
PublisherName
Acoustical Society of America
Status
Superseded
SupersededBy
Supersedes

ANSI S12 PT6 : 2016 METHODS FOR MEASURING THE REAL-EAR ATTENUATION OF HEARING PROTECTORS
ANSI S1.4 : 1983 SPECIFICATION FOR SOUND LEVEL METERS
ANSI/ASA S12.42 : 2010 METHODS FOR THE MEASUREMENT OF INSERTION LOSS OF HEARING PROTECTION DEVICES IN CONTINUOUS OR IMPULSIVE NOISE USING MICROPHONE-IN-REAL-EAR OR ACOUSTIC TEST FIXTURE PROCEDURES
ANSI/ASA S3.20 : 2015 American National Standard Bioacoustical Terminology
CSA Z94.2 : 2014 HEARING PROTECTION DEVICES - PERFORMANCE, SELECTION, CARE, AND USE
ISO 4869-2:1994 Acoustics Hearing protectors Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn
AS/NZS 1270:2002 Acoustics - Hearing protectors (Reconfirmed 2014)
CFR 40(PTS190-259) : JUL 2017 PROTECTION OF ENVIRONMENT - ENVIRONMENTAL PROTECTION AGENCY

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