According to the requirements of GB/T 20247-2006, the volume of the newly built reverberation room shall not be less than 200m ³。 The gradually decaying sound field in the reverberation room should be fully diffused. To achieve satisfactory diffusion, fixed or suspended diffusers or rotating diffusers need to be installed regardless of the shape of the reverberation chamber. The test piece is installed according to one of the installation methods in Appendix B, with the sound-absorbing surface facing upwards and placed in a rectangular shape, with an area of approximately 10-12 square meters. Strictly operate and measure reverberation specimens in open spaces and with specimens according to standard requirements, and then calculate the sound absorption coefficient and noise reduction coefficient. The sound insulation room is specially designed according to the requirements of the national standard GB/T 19889.3-2005. Use two adjacent reverberation rooms, one as the sound source room and the other as the receiving room. If one side of the specimen has significantly higher sound absorption than the other side, the high absorption side should face the sound source room, and the sound source room should be equipped with a diffuser. There is a common wall between the two rooms, and there is an installation hole on the wall, with an area of about 10 square meters for installing measuring materials. The edge of the hole is made of steel tooling, and the test pieces are placed in the middle of the hole during installation, meaning that the depth of the holes on both sides is basically the same

Function of testing report:

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6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

100% inspection and testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Testing and testing characteristics:

1. The testing industry is fully covered, meeting different testing needs

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3. Engineers provide one-on-one services to make testing more accurate

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7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China