Selection of noise meters for several noise measurements
1.Acoustics-environmental noise measurement
Measurement methods can be in accordance with GB3222-94 "acoustic environmental noise measurement methods".
Requirements for the measurement of LA, LAeq, LN (L5, L10, L50, L90, L95), Ld, Ln, the precision of the instrument requirements for more than 2-type integral noise meter and automatic monitoring instruments for environmental noise, the performance in line with the provisions of the GB3785 "noise meter electrical and acoustic performance and measurement methods".
2.Measurement of urban environmental noise
Measurement methods can be in accordance with GB/T14623-93 "Measurement Methods of Environmental Noise in Urban Areas".
Requirements for the measurement of LA, LAeq, LN (L10, L50, L90), Ld, Ln, the precision of the instrument requirements for more than 2-type integral noise meter and automatic monitoring instruments for environmental noise, performance in line with the provisions of GB3785 "Noise Meter Electricity, Acoustic Performance and Measurement Methods".
3. Noise measurement of industrial enterprises
Measurement methods can be in accordance with GB12349-90 "industrial enterprises plant noise measurement methods".
Requirements for the measurement value of LA, LAeq, the precision of the instrument requires more than 2 types of noise meters and environmental noise automatic monitoring instruments, performance in line with the provisions of GB3785 "Noise Meter Electrical and Acoustic Performance and Measurement Methods".
4. Noise measurement of construction sites
Measurement methods can be in accordance with GB12524-90 "construction site noise measurement methods".
Requirements for the measured value of LAeq, the precision of the instrument requirements for more than 2-type integral noise meter and automatic monitoring instruments for environmental noise (dynamic range of not less than 50dB), performance in line with the provisions of GB3785 "Noise Meter Electricity, Acoustic Performance and Measurement Methods".
5. Motor vehicle noise measurement
Measurement methods can be in accordance with GB/T14365-93 "Acoustics Motorized Vehicle Noise Measurement Methods".
Requirements for the measurement of the value of A-weighted "fast" characteristics of the sound pressure level Lp, the precision of the instrument requires 1-type or 2-type noise meter, the performance in line with the provisions of GB3785 "noise meter electricity, sound performance and measurement methods.
6. Measurement of railroad rolling stock radiation noise
Measurement method can be in accordance with GB/T5111-95 "Acoustics Railway Rolling Stock Radiated Noise Measurement".
Requirements for the measurement of the value of LPAF, but also for spectral analysis measurements, the precision of the instrument requires more than 2-type integral noise meter and environmental noise automatic monitoring instruments, performance in line with the provisions of GB3785, "Noise Meter Electricity, Acoustic Performance and Measurement Methods".
7. Inland waterway and ship noise measurement
Measurement method can be in accordance with GB/T4964-85 "Measurement of Radiated Noise from Ships in Inland Waterways and Harbors".
Requirements for the measurement of the value of A-weighted "fast" characteristics of the sound pressure level Lp, A-weighted "impulse" sound pressure level Lp, on the accuracy of the instrument requirements of the 1-type or 2-type noise meter, the performance in line with the provisions of the GB3785 "noise meter electrical and acoustic performance and measurement methods".
8. Aircraft noise measurement
Measurement method can be in accordance with GB9661-88 "around the airport aircraft noise measurement methods".
Requirements for the measurement of the value of A-weighted "fast" characteristics of the sound pressure level Lp, aircraft noise effective feeling noise level Lepn, the precision of the instrument requires more than 2 types of noise meters and environmental noise automatic monitoring instruments, performance in line with the provisions of GB3785, "Noise Meter electrical and acoustic performance and measurement methods".
9. Noise source sound power level measurement
Measurement method can be in accordance with GB/T16538-96 "Acoustics Acoustic Pressure Method for Determining Sound Power Level of Noise Sources Using Standard Sound Source Simple Method".
Test instrument using GB3785 in the provisions of the type 2 or more than 2 types of sound level, measured with a slow stop, noise meter and microphone * good between the use of extension cables or extension rods.
10.Environmental vibration measurement
Measurement methods can be in accordance with GB10071-88 "Measurement Methods of Environmental Vibration in Urban Areas".
Requirements for the measurement of VAL, VL, VLZ, VLZN. Measuring instruments should be in line with ISO/DP8041-84 in the provisions of the instrument used to measure environmental vibration.
