PDF Price
$194.00
ADD TO CART
ASA: Acoustical Society of America
ASA, the Acoustical Society of America, is a nonprofit organization that develops and publishes standards on acoustics, mechanical shock, noise and other associated subjects. Headquartered near New York City, United States, ASA is composed of nearly 7,000 members and is a founding member of the American Institute of Physics. ASA also serves as the administrator for the U.S. TAGs (United States Technical Advisory Group) to ISO/TCs 43 and 108 (International Organization for Standardization/Technical Committee) and to various subcommittees within each.
Standards from ASA are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: [email protected] or 1-212-642-4980 or Request Proposal Price.Below are ASA's best-selling standards. To find additional standards, please use the search bar above.
ASA/ANSI S12.2-2019 (R2023)
Criteria for Evaluating Room Noise
This Standard provides three primary methods for evaluating room noise: a survey method that employs the A-weighted sound level; an engineering method that employs expanded noise criteria (NC) curves; and a method for evaluating low-frequency fluctuating noise using room noise criterion (RNC) curves.
ASA/ANSI S3.6-2018 (R2023)
Specification for Audiometers
The audiometers covered in this specification are devices designed for use in determining the hearing threshold level of an individual in comparison with a chosen standard reference threshold level. This standard provides specifications and tolerances for pure tone, speech, and masking signals and describes the minimum test capabilities of different types of audiometers.
PDF Price
$194.00
ADD TO CART
ASA/ANSI S3.1-1999 (R2023)
Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms
This Standard specifies maximum permissible ambient noise levels (MPANLs) allowed in an audiometric test room that produce negligible masking ( 2 dB) of test signals presented at reference equivalent threshold levels specified in ANSI S3.6-1996 American National Standard Specification of Audiometers. The MPANLs are specified from 125 to 8000 Hz in octave and one-third octave band intervals for two audiometric testing conditions (ears covered and ears not covered) and for three test frequency ranges (125 to 8000 Hz, 250 to 8000 Hz, and 500 to 8000 Hz). The Standard is intended for use by all persons testing hearing and for distributors, installers, designers, and manufacturers of audiometric test rooms. This standard is a revision of ANSI S3.1-1991 American National Standard Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms.
PDF Price
$127.00
ADD TO CART
ANSI/ASA S3.5-1997 (R2017)
Methods for Calculation of the Speech Intelligibility Index
Defines a method for computing a physical measure that is highly correlated with the intelligibility of speech as evaluated by speech perception tests given a group of talkers and listeners. This measure is called the speech Intelligibility Index, SII. The SII is calculated from acoustical measurements of speech and noise.
PDF Price
$164.00
ADD TO CART
ASA/ANSI S12.6-2016 (R2025)
Methods for Measuring the Real-Ear Attenuation of Hearing Protectors
This standard specifies laboratory-based procedures for measuring, analyzing, and reporting the passive noise-reducing capabilities of hearing protectors. The procedures consist of psychophysical tests conducted on human subjects to determine the real-ear attenuation measured at hearing threshold. Two fitting procedures are provided: Method A) trained-subject fit, intended to describe the capabilities of the devices fitted by carefully trained users, and Method B) inexperienced-subject fit, utilizes subjects with little or no experience with respect to the use of hearing protection, in order to approximate the attenuation that can be attained by groups of users as reported in real-world occupational studies. Regardless of test method, the attenuation data will be valid only to the extent that the users wear the devices in the same manner as during the tests. This standard does not address issues pertaining to computational schemes or rating systems for applying hearing protector attenuation values (see ANSI/ ASA S12.68), nor does it specify minimum performance values for hearing protectors, or addresscomfort or wearability features. Method A of this standard corresponds to ISO 4869-1:1990, Acoustics –Hearing protectors – Part 1: Subjective method for the measurement of sound attenuation, and Method B corresponds to ISO/TS 4869-5:2006, Acoustics – Hearing protectors – Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects.
PDF Price
$194.00
ADD TO CART
ASA/ANSI S2.26-2001 (R2025)
Vibration Testing Requirements and Acceptance Criteria for Shipboard Equipment
This Standard specifies the procedure for generating a graphical presentation of the frequency and temperature dependence of the complex modulus of viscoelastic materials. This Standard is the National counterpart of ISO 10112, Damping materials - Graphical presentation of the complex modulus.
PDF Price
$145.00
ADD TO CART
ASA/ANSI S3.22-2024
Specification of Hearing Aid Characteristics
This standard describes measurement methods for air-conduction hearing aids suitable for specification and quality testing purposes. Test methods described include output sound pressure level with a 90 dB input level, full-on gain, frequency response, harmonic distortion, equivalent input noise, current drain, and induction-coil sensitivity. Tolerance limits in relation to values specified by the manufacturer are also provided for these parameters. A normative annex describes calibration of the sound source. Informative annexes provide information about magnetic field generation, characteristics of battery simulators, additional tests to evaluate the electroacoustic performance of hearing aids, and information about measurement uncertainty for quality assurance.
PDF Price
$194.00
ADD TO CART
ASA/ANSI S12.42-2010 (R2024)
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
This standard specifies microphone-in-real-ear (MIRE) methods for the measurement of the insertion loss of active and passive circumaural earmuffs, helmets, and communications headsets, and specifies acoustic test fixture (ATF) methods for the measurement of the insertion loss of active and passive earplugs, earmuffs, helmets, and communications headsets. The MIRE methods are appropriate for use with continuous noise whereas the ATF methods may be used with both continuous noise and high-level impulsive noise test signals. The standard contains information on instrumentation, calibration, and electroacoustic requirements, procedures for determining sound pressure levels in the ear with and without the hearing protection devices in place, and procedures for calculating the corresponding insertion loss values. The standard also describes how to combine the active contribution of insertion loss for active devices measured using the MIRE method with the passive real-ear attenuation measured in accordance with ANSI/ASA S12.6 to obtain an attenuation value for use in estimating sound pressure levels for active protectors in accordance with ANSI/ASA S12.68. Requirements for reporting of the data are also described.
PDF Price
$169.00
ADD TO CART
ASA/ANSI S2.75-2017/Part 1 (R2025)
Shaft Alignment Methodology, Part 1: General Principles, Methods, Practices, and Tolerances
This standard establishes methodology consistent with industry best practices for the measurement, analysis, and correction of alignment of shafts on rotating machinery coupled by means of a flexible coupling where such shafts are supported by two bearings in independent, horizontally mounted machine cases. Electric motors driving a pump, fan, or similar machine are examples of this type of machinery. Rigidly coupled machines are outside of the scope of Part 1 of this standard. The methodology addresses conditions for machinery mounting which directly affects shaft alignment, methods for measuring the amount of shaft misalignment, and practices for relocating machine cases to achieve proper shaft alignment. Tolerances are provided in a system of Alignment Quality Grades. Ancillary information for shaft alignment is provided in eight Annexes.
PDF Price
$194.00
ADD TO CART
ASA/ANSI S1.13-2020 (R2025)
Measurement of Sound Pressure Levels in Air
This standard specifies requirements and describes procedures for the measurement of sound pressure levels in air at a single point in space. These requirements and procedures apply primarily to measurements performed indoors but may be utilized in outdoor measurements under specified conditions. This is a standard applicable to a wide range of measurements and to sounds that may differ widely in temporal and spectral characteristics; more specific American National Standards complement its requirements. This standard applies only to the measurement of continuous sounds, those whose duration is 1 second or greater and does not apply to the measurement of impulsive sounds whose duration is less than 1 second. This standard is intended to be used by practitioners in the field. This is a replacement for a previous version of ANSI S1.13.
PDF Price
$194.00
ADD TO CART