JB/T 12571-2018Noise emitted by climate environmental testing equipment - Determination of emission sound pressure levels at a work station and at other specified positions (English PDF)

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents

• 1 Scope
• 2 Normative references
• 3 Terms and definitions
• 4 Measuring instruments
• 4.1 General requirements
• 4.2 Calibration
• 5 Test conditions
• 5.1 Acoustic environment
• 5.2 Enclosed working positions
• 5.3 Background noise
• 5.4 Meteorological conditions
• 5.5 Other conditions
• 6 Measurands and quantities to be determined
• 6.1 Measurands
• 6.2 Quantities to be determined
• 7 Positioning, installation and operation
• 7.1 Positioning and installation
• 7.2 Operation
• 8 Microphone positions
• 8.1 General requirements
• 8.2 Microphone positions for a seated operator
• 8.3 Microphone positions for a fixed standing operator
• 8.4 Microphone positions when the operator moves along a specified path
• 8.5 Microphone positions for bystanders and unattended equipment
• 8.6 Other specified positions
• 9 Procedure for determining the A-weighted emission sound pressure level and the band emission sound pressure level
• 9.1 General requirements
• 9.2 Choice of the determination method
• 9.3 Approximate free field method
• 9.4 Sound power level data determination method
• 9.5 Equivalent sound absorption area method
• 10 Procedure for measuring the C-weighted peak emission sound pressure level
• 10.1 General requirements
• 10.2 Test steps
• 11 Measurement uncertainty
• 11.1 Method
• 11.2 Determination of the operating and mounting condition standard deviation
• 11.3 Determination of the reproducibility standard deviation
• 11.4 Total standard deviation and expanded measurement uncertainty
• 12 Information to be recorded
• 12.1 General requirements
• 12.2 Equipment under test
• 12.3 Test conditions
• 12.4 Measuring instruments
• 12.5 Determination method
• 12.6 Measurement data
• 13 Test report
• 13.1 Contents and format of the test report
• 13.2 Decision on the conformity with this standard
• 13.3 Statement of the conformity with this standard
• Annex A (informative) Example of a test bench
• Annex B (normative) Emission sound pressure level under the reference meteorological conditions
• B.1 Overview
• B.2 Calculation formula
• B.3 Calculation of the static pressure from the altitude
• B.4 Comprehensive correction value of the meteorological conditions
• Annex C (informative) Case studies
• C.1 Overview
• C.2 Case study of the approximate free field method
• C.3 Case study of the sound power level data determination method
• C.4 Case study of the equivalent sound absorption area method
• Annex D (informative) Recommended format of the test record
• Annex E (informative) Recommended format of the test report
• Bibliography
• Figure 1 Guide for the choice of the determination method
• Figure A.1 Example of a test bench
• Figure C.1 Positions of the equipment and of the microphone in the case study of the approximate free field method
• Figure C.2 Microphone positions in the case study of the sound power level data determination method
• Figure C.3 Microphone positions in the case study of the equivalent sound absorption area method
• Table 1 Approximate values of the mean sound absorption coefficient
• Table 2 Examples of the calculation of the total standard deviation in three different cases
• Table B.1 Comprehensive correction values of the meteorological conditions for the emission sound pressure level
• Table C.1 Case study of the approximate free field method
• Table C.2 Case study of the sound power level data determination method
• Table C.3 Case study of the equivalent sound absorption area method
• Table D.1 Test record of the noise emission sound pressure level of climatic environmental test equipment
• Table E.1 Test report of the noise emission sound pressure level of climatic environmental test equipment