Abstract: in the field of construction machinery testing, noise measurement has been listed as a national mandatory standard test items, that noise is not up to the requirements of the national standard, the test is not qualified. If before the engineering machinery manufacturing enterprises of noise control is not too seriously, so now, since the promulgation and implementation of strong targets, all enterprises have been fully aware of the importance of noise measurement, have taken measures to reduce the noise and to the noise limits in the standard range.
In the field of construction machinery testing, noise measurement [/b] has been listed as a national mandatory standard test items, that noise is not up to the requirements of the national standard, the test is not qualified. If before the engineering machinery manufacturing enterprises of noise control is not too seriously, so now, since the promulgation and implementation of strong targets, all enterprises have been fully aware of the importance of noise measurement [/b], have taken measures to reduce the noise and to noise within the prescribed limit in the range of standard. For the noise thoroughly of their products, some professional production enterprises are equipped with [/b] [b] sound level meter instrument, noise detection, and equipped with specialized testing personnel. But there are also some private and individual enterprises do not have the sound level meter, or although there are, but do not meet the standard requirements of measurement, which can not be measured Leq, which makes the blank market exposed. And what is the product of this market requirement? The sound level meter according to their use can be divided into general sound level meter, vehicle noise, impulse sound level meter integrating sound level meter, noise exposure meter (dosimeters) and statistical sound level meter. According to its accuracy can be divided into 0 types, type 1, type 2 and type four, type 3. Among them, 0 sound level meter is mainly used as a laboratory reference standard; type 1 sound level meter for laboratory and acoustic environment can be used to strictly control the situation; the 2 type sound level meter suitable for general use; type 3 sound level meter is mainly used in the noise investigation site. In our country at present, the standard of testing and testing is GB16710.1 and GB/T16710.2-5. The test instrument used in this standard is 1 type instrument, and has integral function. Therefore, we should first meet the standard requirements of the accuracy, in addition, it should also consider the following aspects: (1) the use of. If only for the general level of measurement, so only with the integral function of the meter can; if it is used for analysis and research, to take further measures to reduce the noise, you should supply instrument with the function of spectrum analysis and integral function. (2) the power characteristics of the frequency. Should have A weight characteristics. (3) the measurement of the upper and lower values of the corresponding construction machinery noise should be satisfied. As for the level of loader [b] noise [/b] measurement meter, the measuring range of at least 70dB-100dB. (4) the size of capacitor microphones. Try to use 1/2 inch or 1 inch specifications, with convenient on-site verification and regular verification, such as the selection of other specifications of the microphones, it can bring trouble to calibration. (5) should be connected with measuring cable accessories, high point (12 meters is appropriate), hood and calibrator. Key words: [b] noise, detection [/b] - information source: China chemical industry equipment network