CNAS (China National Accreditation Service for Conformity Assessment) is China's national accreditation body, responsible for accrediting laboratory capabilities, including in the field of acoustics. A CNAS test report for a quiet cabin may include the following parameters:
Sound insulation performance: The report should include the quiet cabin's sound insulation performance parameters, such as the sound insulation level (expressed in decibels), which indicates the degree of isolation between the cabin and external noise.
Sound absorption performance: The report may include the sound absorption performance parameters of the sound-absorbing materials within the quiet cabin, such as the sound absorption coefficient (variable by frequency and angle), which indicates the material's ability to absorb sound.
Noise transmission: The report may include parameters related to noise transmission within the quiet cabin, such as the noise transmission index (attenuation of the transmission path) and structural vibration transmission.
Noise spectrum: The report may include the noise level and spectral distribution within the quiet cabin within different frequency ranges. Echo Time: The report may include echo time parameters within the sound chamber, such as T30 (the time it takes for a sound to decay to the initial sound level) or RT60 (the time it takes for a sound to decay to double the initial sound level).
Acoustic Characteristics: The report may include acoustic characteristics of the sound chamber, such as acoustic volume, acoustic reflection, and acoustic propagation characteristics.
Test Methods and Equipment: The report should clearly state the test methods and equipment used to ensure the accuracy and reliability of the test. This may include the acoustic measurement equipment used, the measurement location, and the conditions.
Standard Compliance: The report should indicate whether the test results comply with specific acoustic standards, specifications, or certification requirements, such as ISO standards or national standards.
Conclusions and Recommendations: The report may include a summary and evaluation of the sound chamber's acoustic performance, as well as suggestions or measures for improvement to further enhance sound insulation or meet specific requirements.
Please note that the specific CNAS test report parameters may vary depending on the actual test methods, equipment, and standard requirements. Before conducting a CNAS test, it is recommended to contact a CNAS-accredited acoustic laboratory to understand its specific test items and requirements to ensure that the appropriate parameters and results are included in the report.
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