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ASA - ANSI/ASA S12.43

AMERICAN NATIONAL STANDARD Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions

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Organization: ASA
Publication Date: 27 January 1997
Status: active
Page Count: 38
scope:

General

This Standard specifies three methods for measuring sound pressure levels from machinery and equipment, at a workstation and at other specified positions nearby. The three methods are differentiated primarily by the acoustical environment in which the measurements are made:

Method A: Measurements in an essentially free field over a reflecting plane.

Method B: Measurements in any environment that meets certain qualification requirements specified in this Standard.

Method C: Measurements, in a semi-reverbe-rant field, for which the accuracy implied by the measurements under Methods A or B is not required.

A workstation is occupied by an operator of a machine or equipment. It may be located in an open space in the room where the sound source operates, or in a cab fixed to the source, or in an enclosure remote from the source. One or more specified positions may be in the vicinity of an unattended machine. As some of these positions may be occupied occasionally or regularly, they are sometimes referred to as bystander positions.

Emission sound pressure levels are measured with frequency weighting A and, if required, as C-weighted peak and in frequency bands.

Instructions are given for the installation and operation of the machine under test and for the ANSI S12.43-1997 choice of microphone positions for the workstation and for other specified positions. The purpose of the measurements is to permit comparison of the performance of different units of a given family of machinery or equipment, under defined environmental conditions and standardized mounting and operating conditions. The data obtained are also used for the declaration and verification of sound pressure levels as specified in noise test codes.

Method A-engineering method

Method A in this Standard prescribes requirements on the test environment and instruments to permit measurements having an engineering grade of accuracy. Corrections are applied for background noise, but not for the acoustical environment.

Method 8-method requiring environmental corrections

Method B in this Standard specifies the determination of a local environmental correction (the acceptable maximum value of which is prescribed) to be applied to the measured sound pressure levels to exclude the effects of reflections from reflecting surfaces other than the plane on which the machinery or equipment is placed. The accuracy of the measurements (engineering or survey) depends upon the value of the local environmental factor. The local environmental correction is based on the space average sound pressure level on a specified surface, the sound pressure level measured at a specified position, and either an environmental indicator or the equivalent sound absorption area of the test room

Method C-survey method In situ

Method C of this Standard prescribes requirements on the test environment and instruments for measurements that result in the survey grade of accuracy. A method is given for determining a local environmental correction (subject to a prescribed limiting maximum value) to be applied to the measured sound pressure levels in order to exclude at least part of the effects of reflections from reflecting surfaces other than the plane on which the machinery or equipment is placed. This correction is bassd on the equivalent sound absorption area of the test room.

 

Document History

ANSI/ASA S12.43
January 27, 1997
AMERICAN NATIONAL STANDARD Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions
General This Standard specifies three methods for measuring sound pressure levels from machinery and equipment, at a workstation and at other specified positions nearby. The three methods are...
January 27, 1997
American National Standard Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions
A description is not available for this item.
January 27, 1997
American National Standard Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions
This Standard provides three methods to measure sound pressure levels from all types of machinery and equipment at workstations and other specified positions. The first method applies to measurements...
January 27, 1997
American National Standard Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions
A description is not available for this item.
January 27, 1997
American National Standard Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions
General This Standard specifies three methods for measuring sound pressure levels from machinery and equipment, at a workstation and at other specified positions nearby. The three methods are...
January 27, 1997
American National Standard Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions
A description is not available for this item.

References

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