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| Inter-laboratory comparison of sound level meter performance in Shenzhen occupational diseases prevention institutes |
| ZHOU Wei, QIU Hai-li, TIAN Dong-chao, YANG Guang-tao, WANG Xue-yu, ZUO Hong
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| Department of Occupational Hazard Assessment,Shenzhen Prevention and Treatment Center for Occupational Diseases,Shenzhen,Guangdong 518020,China |
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Abstract Objective To learn the accuracy of sound level meters among occupational diseases prevention institutes in Shenzhen and to provide basis for noise measurement and control. Methods In November 2017, the inter-laboratory comparisons between the sound level meters performance results of 9 district-level occupational diseases prevention institutes in Shenzhen were conducted using GLQC-202 multi-frequency point acoustic calibrator,the allowable deviation of the frequency-weighted measurements,the linear level measurements and the simulated on-site noise sources at fixed locations in workplaces were evaluated according to JJG 188-201 and GB/T 27043-2012.Results Eighteen sound level meters were included and were certified within the validated period. The satisfaction rate for frequency-weighted measurement results was 64.7%,and the unsatisfactory results mainly lay in the two high-frequency bands of 4 000 and 8 000 Hz. The satisfaction rate for linear level measurement results was 88.4%,and the unsatisfactory results lay in the two acoustic signals of 104 and 124 dB of the 4 000 Hz octave center frequency band. The satisfaction rates of inter-laboratory Z-score（ZB）and intra-laboratory Z-score（ZW）were 94.4% and 83.3% respectively,and the outlier rates both were 5.6%.Conclusion Although the sound level meters tested were within their valid certification periods,the accuracy of measurement results may still be biased,which mainly lay in the two high-frequency bands of 4 000 and 8 000 Hz.
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Received: 28 June 2018
Revised: 20 August 2018
Published: 04 December 2018
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