Analysis of inter-laboratory comparison results of noise measuring instruments / 中国职业医学

ABSTRACT

OBJECTIVE: To evaluate the interlaboratory comparison results of noise measuring instruments in the occupational hygiene technical service institutions. METHODS: The basic performance data, multi-frequency acoustic calibration measurement results and simulated workplace noise at fixed points of 60 noise measuring instruments were collected. The instruments were from 60 occupational health technical service institutions who participate in the inter-laboratory comparison study in noise measuring instruments. The results of the measurements were analyzed using quartile robust statistical technology and z score evaluation method.RESULTS: All 60 participating comparison noise measuring instruments were examined or calibrated, and 58 instruments(96.7%) were used within the term of validity of examination or calibration. The 58 instruments were tested by multi-frequency noise calibration measurement. The comparative passing rate of the instrument accuracy was 94.8%(55/58); and the linearity test passing rate was 87.9%(51/58). There were 59 instruments participated in the simulated workplace noise at fixed points. The z-score pass rate of the two comparison measurement points was 89.8%(53/58). A total of 57 enterprises participated all the instrument performance comparison tests, with a pass rate of 94.7%(54/57). CONCLUSION: Performance of noise measuring instruments from the occupational hygiene technical service institutions is generally good. However, there are a small number of instruments have poor accuracy and linearity, and there are measurement bias that require improvement.