What categories can noise measurement with a sound level meter be divided into?
What are the categories of noise measurement for a noise meter? As is well known, vibrations can produce noise such as rotating machinery, impact, resonance, friction, as well as noise generated by flow fields, environmental noise, combustion noise, and other noises. The generation of noise has an impact on our daily life and work. To determine the magnitude of noise, a noise measuring instrument is required.
A noise meter, also known as a sound level meter, is a fundamental instrument used 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.
Noise meters are mainly used to measure environmental noise, conduct noise engineering, quality control, and health prevention and control. Used for measuring noise volume in various occasions such as factories, offices, transportation roads, audio systems, homes, as well as air conditioning, refrigerators, etc. So, what are the categories of noise measurement for a noise meter? Zhuhai Tianchuang Instrument Company has summarized the following points for everyone:
1. From the perspective of measuring objects, it can be divided into the measurement of environmental noise (sound field) characteristics and the measurement of sound source characteristics.
2. According to the temporal characteristics of the sound source or field, it can be divided into steady-state noise measurement and non-stationary noise measurement. Unsteady noise can be divided into periodic variation noise, irregular variation noise, and pulse sound.
3. According to the frequency characteristics of the sound source or field, it can be divided into broadband noise, narrowband noise, and noise containing prominent pure tone components.
4. According to the required accuracy of measurement, it can be divided into precision measurement, engineering measurement, and noise survey.
