Baijian Testing is mainly engaged in textile, insulation, cosmetics, food, hardware industry related product testing, as well as providing product certification services, but also in the broadening of the scope of the testing industry, the laboratory issued a report can be stamped CNAS/CMA/CAL qualification seal, the report is true and effective.
Report qualification: CNAS, CMA, CAL, etc
. Presentation style: electronic
version of the testing cycle: 3-15 working days (expedited can be expedited)
Testing cost: Quotation according to customer needs and experimental complexity
Sample size: Choose to send samples or visit the door according to the sample size
Overview
This standard specifies the measurement method for sound pressure levels on the surface of surrounding noise sources (machines or equipment) in anechoic and semi anechoic rooms.
. These measurement methods can be used to calculate the one-third octave band or A-weighted sound power level of the sound source (as well as the sound energy level under pulse or transient noise radiation), including correction for the difference between the meteorological conditions of the measurement time and location and the reference meteorological conditions corresponding to the reference characteristic sound impedance. In general, the measurement frequency range is 1/3 octave band with a center frequency of 100 Hz to 10 000 Hz. As needed, the frequency range can be expanded or reduced, and the testing room should meet the requirements for these frequenciesTypes of noise and noise sources
The methods specified in this standard are applicable to all types of noise defined in GB/T19052 (steady-state, non-stationary, fluctuating, burst, etc.).
The measured noise source can be equipment, machine, component or accessory. The maximum size of the sound source depends on the radius of the imaginary spherical or hemispherical surface of the measurement envelopeTesting Room
The testing room is an anechoic or semi anechoic room that meets the requirements of this standard, also known as a free field testing room and a semi free field testing room, respectively.
Measurement Uncertainty
This standard provides the uncertainty of the sound power level and sound energy level when measured using the specified frequency band and A-weighting.
. The uncertainty meets the level 1 accuracy requirements of GB/T 19052-2003Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems100% 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 requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China100 inspection and testing process:
1. Telephone communication and confirmation of needs;
2. Recommend the plan and confirm the quotation;
3. Mailing samples and arranging testing;
4. Progress tracking and result feedback;
5. Issue reports and after-sales service;
6. If it needs to be expedited, priority processing;