Noise meter for factories, construction sites and other places
1. Measurement of noise in industrial enterprises
The measurement method can be in accordance with GB12349-90 "Measurement Method for Industrial Enterprise Boundary Noise"
The required measurement values are LA and LAeq, and the instrument accuracy requirement is a type 2 or above noise meter and an environmental noise automatic monitoring instrument, with performance in accordance with the provisions of GB3785 "Noise Meter Electrical and Acoustic Performance and Measurement Methods".
2. Measurement of noise at construction sites
The measurement method can be in accordance with the requirements of GB12524-90 "Method for Measuring Noise at the Boundary of Construction Sites". The measurement value should have LAeq, and the accuracy of the instrument should be at least 2 types of integrated noise meters and environmental noise meters
The dynamic monitoring instrument (with a dynamic range of not less than 50dB) meets the requirements of GB3785 "Noise Meter Electrical and Acoustic Performance and Measurement Methods".
3. Measurement of stationary noise of motor vehicles
The measurement method can be in accordance with GB/T14365-93 "Acoustic Measurement Method for Fixed Noise of Motor Vehicles"
The measurement value is required to have the A-weighted "fast" characteristic sound pressure level Lp, and the instrument accuracy requires a Type 1 or Type 2 noise meter with performance in accordance with the provisions of GB3785 "Electrical and Acoustic Performance and Measurement Methods of Noise Meters".
Introduction to Noise Meter
A noise meter, also known as a sound level meter, is the most basic instrument in noise measurement. A sound level meter generally consists of a condenser microphone, preamplifier, attenuator, amplifier, frequency meter network, and effective value indicator head. The working principle of a sound level meter is that the sound is converted into an electrical signal by a microphone, and then the impedance is transformed by a preamplifier to match the microphone with an attenuator. The amplifier adds the output signal to the network, performs frequency weighting on the signal (or an external filter), and then amplifies the signal to a certain amplitude through attenuators and amplifiers before sending it to the effective value detector.
