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  • ANSI S12.68 : 2007

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    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    Superseded date:  13-07-2019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

    Publisher:  Acoustical Society of America

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    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    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.

    General Product Information - (Show below) - (Hide below)

    Committee S12
    Development Note Includes Program file (ZIP format). (07/2009)
    Document Type Standard
    Product Note Reconfirmed 2007
    Publisher Acoustical Society of America
    Status Superseded
    Superseded By

    Standards Referencing This Book - (Show below) - (Hide below)

    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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