ANSI/ASA S12.68 : 2007(R2017)
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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
Hardcopy , PDF
06-26-2020
English
09-29-2017
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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
This standard specifies 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 2017
|
| 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Superseded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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