This standard applies to the measurement of steady-state noise and non-steady-state noise other than impulse noise in the production environment, non-production environment and factory boundary of industrial enterprises. GBJ 122-1988 Industrial Enterprise Noise Measurement Specification GBJ122-1988 Standard Download Decompression Password: www.bzxz.net

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National Standard of the People's Republic of China
Noise Measurement Specification for Industrial Enterprises
GBJ122—88
1989 Beijing
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National Standard of the People's Republic of China
Noise Measurement Specification for Industrial Enterprises
GBJ122—88
Editor Department: Office of Capital Planning and Construction Committee Approval Department: State Planning Commission of the People's Republic of China Effective Date: December 1, 1988
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the Release of "Industrial Enterprise Noise Measurement Specification"
Standard [1988] No. 563
According to the requirements of the State Planning Commission's Document [1985] No. 1, the "Industrial Enterprise Noise Measurement Specification" compiled by the Beijing Labor Protection Science Research Institute and relevant units has been reviewed by relevant departments. The "Industrial Enterprise Noise Measurement Specification" GBJ122-88 is now approved as a national standard and will be implemented from December 1, 1988. This specification is managed by the Office of the Capital Planning and Construction Commission. Its specific interpretation and other work are the responsibility of the Beijing Labor Protection Research Institute. The publication and distribution is the responsibility of China Planning Press.
National Planning Commission
April 13, 1988
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Engineering Construction Standards Full Text Information System
Preparation Instructions
This specification is organized by the National Acoustic Standardization Committee in accordance with the requirements of the National Planning Commission's Document No. 19851, and is specifically compiled by the Beijing Institute of Labor Protection Science.
In the process of compiling this specification, the compiling unit investigated and studied the practical experience and research results of relevant domestic units, collected and analyzed similar foreign measurement standards and related technical information, conducted theoretical analysis and experimental verification of some important contents, and proposed a draft for soliciting opinions; widely solicited opinions from relevant domestic units, held a symposium, and proposed a draft for review after repeated revisions. After discussion and agreement by the Architectural Acoustics Subcommittee of the National Acoustic Standardization Technical Committee, it was finally reviewed and finalized by the National Acoustic Standardization Technical Committee.
This specification consists of four chapters and two appendices. The contents include: measurement conditions, noise measurement in production environment and noise measurement in non-production places. In the process of implementing this specification, it is hoped that all units will pay attention to accumulating data and conscientiously summarizing experience. If there are any changes or additions that need to be made, please send your opinions and relevant materials to Beijing Institute of Labor Protection Science (No. 41, Rufuli, Taoranting Road, Beijing) for reference in future revisions.
Office of the Capital Planning and Construction Committee
March 18, 1988
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Chapter 1 General
Chapter 2 Noise Measurement Conditions
Section 1 Measuring Instruments
Section 2 Quantity to be Measured
Section 3. Method of reading measured values… Section 4 Environmental Conditions
Chapter 3 Noise Measurement in Production Environment
Section 1 Equipment Operating Conditions
Section 2 Location of Measuring Points
Section 3
Noise Measurement Records
Noise Measurement in Non-production Sites
Chapter 4
Section 1
Section 2
Outdoor Noise Measurement in Non-production Sites·
Indoor Noise Measurement in Non-production Sites·
Noise Measurement at Factory Boundary
Section 3
Section 4 Noise Measurement Records
Appendix—||tt| |Appendix 2
Appendix 3
Industrial enterprise noise measurement record
Equivalent A sound level measurement method
Terms used in this specification
Additional explanation
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Chapter 1 General
Article 1.0.1 This standard is formulated to unify the noise measurement methods for all production environments and non-production environments of industrial enterprises and to facilitate the evaluation and control design of industrial enterprise noise.
This standard applies to the measurement of steady-state noise in the production environment, non-production environment, and factory boundary of industrial enterprises, and non-steady-state noise other than impulse noise. Article 1.0.3 In addition to implementing this specification, noise measurement in industrial enterprises shall also comply with relevant national standards and specifications in force.
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Chapter II
Noise Measurement Conditions
Section I Measuring Instruments
Article 2.1.1 For noise measurement, a sound level meter of type 2 or with performance better than type 2 or other acoustic instruments with equivalent performance shall be used. An integrating sound level meter shall be used to measure the equivalent A sound level; the above sound level meter may also be used when there is no integrating sound level meter. The performance of the instrument used for noise measurement shall comply with the provisions of the current national standard "Electroacoustic Performance and Test Methods of Sound Level Meters"; integrating sound level meters shall comply with the provisions of IEC804-85 "Integrating Average Sound Level Meters".
Article 2.1.2 The sound level meter must be acoustically calibrated before and after noise measurement. If the difference between the calibration values ​​before and after is equal to or greater than 2B, the measurement value is invalid. The sound pressure level calibrator used for calibration shall be calibrated regularly according to the requirements of JJG176-84 "Trial Calibration Procedure for Sound Pressure Level Calibrators", and the sound level meter shall be calibrated regularly according to the current national standard "Standard Noise Source".
Acoustic measurement and calibration instruments shall be calibrated at least once every two years. Section 2 Quantities to be measured
Article 2.2.1 Steady-state noise shall measure the A sound level, and the C sound level may be measured when necessary. Article 2.2.2 Non-steady-state noise shall measure the daily equivalent A sound level. Section 3 Methods for reading measurement values
The "slow gear" time characteristic of the sound level meter shall be used to measure steady-state noise. Article 2.3.1
The average reading within 5s shall be taken for one measurement. Engineering Construction Standard Full Text Information System
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Article 2.3.2 The "slow gear" time characteristic of the sound level meter should be used to measure non-steady-state noise, and the measurement time should be determined according to the noise change characteristics. The data measured within the measurement time should be able to represent the daily equivalent A sound level. For periodically changing noise, the measurement time should be equal to an integer multiple of the noise change cycle, and the shortest should not be less than one change cycle. When using a non-integrating sound level meter to measure the equivalent A sound level, the value should be taken according to the provisions of Appendix 2.
Section 4 Environmental Conditions
Article 2.4.1 When measuring outdoors, the microphone should be equipped with a windshield, and the measurement should be stopped when the wind speed is equal to or greater than 6m/s.
Article 2.4.2 During the measurement process, the interference of environmental factors such as vibration, electromagnetic fields, temperature and humidity should be avoided or reduced.
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Engineering Construction Standard Full Text Information System
Chapter 3 Noise Measurement in Production Environment
Section 1 Equipment Operation Status
Article 3.1.1 During noise measurement, production equipment must be in normal working condition and maintain the operating condition unchanged.
Section 2 Measurement Point Location
Article 3.2.1 The selection of measurement points should be able to effectively reflect the noise level of each operating position in the workshop.
Article 3.2.2 In a factory building or workshop designed according to the process flow, or in a production environment with obvious division of labor, the measurement points should include the operating positions and operation routes of each type of work. Article 3.2.3 In a workshop where the division of labor is not obvious, the measurement points should select the operating positions of typical types of work.
Article 3.2.4
Article When it is necessary to understand the noise distribution in other areas of the workshop, noise measurement points can be selected in the areas where workers often move to observe or manage production, such as passages, rest areas, etc.
Article 3.2.5 The microphone at the measuring point should be placed at the height of the human ear. During measurement, the microphone should be pointed at the sound source with greater impact. If it is difficult to determine the direction of the sound source, the microphone should be pointed vertically upward.
Section 3 Noise Measurement Records
Article 3.3.1 The noise measurement of industrial enterprises’ production environment should be filled in according to the contents listed in Appendix 1, Table 1.1.
Article 3.3.2 When necessary, the noise distribution map of the workshop should be given for the noise measurement of the production environment.
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Noise Measurement in Non-production Sites
Fourth Draft
Section 1 Outdoor Noise Measurement in Non-production Sites Section 4.1.Article 1 The measurement points for outdoor noise measurement in non-production places of industrial enterprises shall be selected along the outside of production workshops and non-production buildings. For production workshops, the measurement points shall be 3 to 5 meters away from the outside of the workshops, and for non-production buildings, the measurement points shall be 1 meter away from the outside of the buildings.
Article 4.1.2 The microphone shall be placed at a height of 1.2 meters above the ground at the measurement point, and the microphone shall be pointed at the sound source with greater influence.
Section 2 Indoor noise measurement in non-production places Article 4.2.1 For indoor noise measurement in offices, design studios, conference rooms, medical rooms, nurseries, warehouses, etc., generally three measurement points shall be selected near the center of the room to take the average value.
Article 4·2·2 The microphone shall be placed at a height of 1.2 meters above the ground at the measurement point, and the microphone shall be pointed at the sound source with greater influence.
Article 4.2.3 When measuring noise, the indoor acoustic environment (opening and closing of doors and windows, and the operating status of indoor sound sources such as typewriters and air conditioners) shall meet normal use conditions.
Section 3 Noise Measurement at Factory Boundary
Article 4.3.1 The noise at factory boundary shall be measured in accordance with the provisions of the current national standard "Urban Environmental Noise Measurement Method". Engineering Construction Standard Full Text Information System
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Noise Measurement Records
Section 4
Noise measurement in non-production environments of industrial enterprises shall be filled in according to the contents listed in Article 44.1
1.2 of the attached table.
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Appendix 1 Industrial Enterprise Noise Measurement Record Table Industrial Enterprise Production Environment Noise Measurement Record Table Measurement Location
Measurement Time
Measurement and Calibration Instrument
Measurement Point Number
Specific Location of Measurement Point
Measurer
Standard Value of Sound Pressure Level dB
Before Measurement
After Measurement
Number of Operating (and Total) Units
Schematic Diagram of Equipment Distribution and Measurement Point Distribution (Please Indicate the Workshop Size) Engineering Construction Standards Full Text Information System
Appendix 1·1
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