Global United Technology Services Co.,Ltd.
Professional Certification & Testing Service for clients over the world
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Provide all kinds of noise detection items
These for people to talk and work do not need the sound called noise, judging from the physical phenomenon, all irregular or random sound signals called noise; The judgment of noise is also related to people's subjective feeling and psychological factors, that is, all the unwanted interference sound is called noise.
Product range:
According to the mechanism, it can be divided into three types: air dynamic noise, mechanical noise and electro-magnetic noise.
According to the source, it can be divided into five categories: traffic noise, industrial noise, construction noise, social noise and natural noise.
Service project:
1. Environmental noise detection
(1) Noise source
Measurement of noise source Noise level data: sound pressure level, A sound level, A sound level rate level, octave band sound power level, and effective sensory noise level.
The way to obtain noise source data: analogical measurement method, citing existing data.
(2) Requirements for measuring the current situation of environmental noise
(1) measuring the amount
A. The measured amount of environmental noise is equivalent continuous A sound level; The measurement quantity of high sound level burst noise should also be the maximum A sound level and noise duration; The measured quantity of aircraft noise at the airport is the weighted equivalent continuous sensory noise level.
B. Noise source measurements include SPL, total SPL, A, linear or power level, A, etc.
C. For more special noise sources, the frequency characteristics of the sound level and the A-level should be measured simultaneously.
D. Pulse noise should be measured at the same time as A sound level and pulse period.
② Measurement period
A. Select an appropriate time period for measurement under the normal operating condition of the sound source.
B. Each measurement point shall be measured separately for day and night periods for comparison with the corresponding standard.
C. In case of large noise fluctuation, the number of daytime and nighttime measurements should be increased.
(3) Measurement record content
A. Measure the model and grade of the instrument, and calibrate the instrument during its use.
B. Serial number of each measurement point, measurement period and corresponding sound level data.
C. Operation of sound source.
Technical requirements for noise monitoring and measurement plan formulation, field investigation method, monitoring point setting, indoor low-frequency noise measurement method, monitoring data processing and evaluation, data compilation and monitoring quality assurance, etc.
This standard applies to the monitoring of indoor low-frequency noise pollution caused by noise from fixed equipment propagated by structure.
2. Certification services
The test report issued by Global Zhongyi has legal effect and can be used in scenarios such as the entry of supermarkets, product appeals, anti-malicious rights protection, and auctions (appeals and auctions must meet Party A's testing requirements).