Correct choice of noise meter
For the sake of unification, some standards for noise measurement have been formulated internationally and domestically. These standards not only specify the method of noise measurement, but also specify the technical requirements for the use of sound level meters. We can use these standards to better understand Choose the right sound level meter.
1. Acoustics - environmental noise measurement
The measurement method can be in accordance with GB3222-94 "Acoustic Environmental Noise Measurement Method"
The measured values are required to be LA, LAeq, LN (L5, L10, L50, L90, L95), Ld, Ln, and the accuracy of the instrument is required to be type 2 or above integral sound level meter and environmental noise automatic monitoring instrument, and the performance conforms to GB3785 "Sound Level Electricity meter, sound performance and measurement method".
2. Urban environmental noise measurement
The measurement method can be in accordance with GB/T14623-93 "Measurement Method of Urban Regional Environmental Noise"
The measured values are required to include LA, LAeq, LN (L10, L50, L90), Ld, and Ln. The accuracy of the instrument is required to be type 2 or above integral sound level meter and environmental noise automatic monitoring instrument. The performance conforms to GB3785 "Sound Level Meter Performance and measurement methods".
3. Noise measurement of industrial enterprises
The measurement method can be in accordance with GB12349-90 "Measurement Method of Noise at the Boundary of Industrial Enterprises"
The measured values are required to have LA and LAeq, and the accuracy of the instrument is required to be a sound level meter of type 2 or above and an automatic environmental noise monitoring instrument, and the performance meets the requirements of GB3785 "Sound Level Meter Electrical, Acoustic Performance and Measurement Methods".
4. Noise measurement of construction site
The measurement method can be in accordance with GB12524-90 "Measurement Method of Noise at Boundary of Construction Site"
The measured value is required to have LAeq, and the accuracy of the instrument is required to be type 2 or above integrated sound level meter and environmental noise automatic monitoring instrument (dynamic range not less than 50dB), and the performance meets the requirements of GB3785 "Sound Level Meter Electrical, Acoustic Performance and Measurement Methods".
5. Motor vehicle fixed noise measurement
The measurement method can be in accordance with GB/T14365-93 "Acoustic Motor Vehicle Stationary Noise Measurement Method"
The measured value is required to have an A-weighted "fast" characteristic sound pressure level Lp, and the accuracy of the instrument is required to be a type 1 or type 2 sound level meter, and the performance meets the requirements of GB3785 "Sound Level Meter Electrical, Acoustic Performance and Measurement Methods".
6. Measurement of radiation noise of railway rolling stock
The measurement method can be in accordance with GB/T5111-95 "Radiation Noise Measurement of Acoustic Railway Rolling Stock"
The measured value is required to have LPAF, and spectrum analysis and measurement can also be performed. The accuracy of the instrument is required to be type 2 or above integrated sound level meter and environmental noise automatic monitoring instrument.
7. Inland waterway and ship noise measurement
The measurement method can be in accordance with GB/T4964-85 "Measurement of Radiated Noise from Ships in Inland Waterways and Ports"
The measured value is required to have A-weighted "fast" characteristic sound pressure level Lp, and A-weighted "pulse" sound pressure level Lp. The accuracy of the instrument requires a type 1 or type 2 sound level meter, and its performance conforms to GB3785 "Sound Level Meter Electricity, Sound Performance and measurement methods".
8. Aircraft noise measurement
The measurement method can be in accordance with GB9661-88 "Measurement method of aircraft noise around the airport"
The measured value is required to have A-weighted "fast" characteristic sound pressure level Lp, aircraft noise effective perception noise level Lepn, and the accuracy of the instrument requires a sound level meter of type 2 or above and an automatic environmental noise monitoring instrument, and its performance conforms to GB3785 "Sound Level Meter, Acoustic Performance and Measurement Methods".
9. Noise source sound power level measurement
The measurement method can be in accordance with GB/T16538-96 "Acoustic Sound Pressure Method Determination of Noise Source Sound Power Level Using Standard Sound Source Simple Method"
The test instrument uses the sound level of type 2 or above specified in GB3785, and measures it with a slow gear. It is best to use an extension cable or an extension rod between the sound level meter and the microphone.
10. Environmental vibration measurement
The measurement method can be in accordance with GB10071-88 "Measurement Method of Urban Regional Environmental Vibration"
It is required to measure VAL, VL, VLZ, VLZN. Measuring instruments shall comply with the instruments for measuring environmental vibration specified in ISO/DP8041-84
