Discussion on Measurement Errors of Noise Contrast Test
Multiple field tests on noise sources of different type are carried out by using different instruments and the error ranges of using different instruments under different working conditions are analyzed to provide some references for noise field comparison tests and new instrument acceptance.The research results show that within the sound pressure level range of 40-80 dB,when using different instruments to conduct synchronous monitoring at the same measuring point which is relatively close to the same noise source,95%of the comparison errors can be controlled within±1.0 dB;more than 90%of the comparison errors are within±0.8 dB;more than 85%of the comparison errors are within±0.7 dB.The greater the intensity of the sound source is and the longer the test time is,the smaller the comparison errors are.
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