Introduction to the Sensitivity Calibration and Influencing Factors of the Noise Meter
In order to ensure the accuracy of the measurement, it should be calibrated before and after use.
Fit the sound level calibrator on the microphone, turn on the calibration power, read the value, adjust the sensitivity potentiometer of the noise meter, and complete the calibration.
Noise Meter - Influencing Factors
The noise meter is mainly used to measure noise, and the classification of noise measurement mainly includes the following types:
1. From the measurement object, it can be divided into the characteristic measurement of environmental noise (sound field) and the measurement of sound source characteristics.
2. From the time characteristics of the sound source or sound field, it can be divided into steady-state noise measurement and unsteady-state noise measurement. Non-stationary noise can be divided into periodic noise, irregular noise and pulse sound.
3. From the frequency characteristics of the sound source or sound field, it can be divided into broadband noise, narrowband noise and noise containing prominent pure tone components.
4. From the accuracy of measurement requirements, it can be divided into precision measurement, engineering measurement and noise survey.
Is a noise detector the same as a sound level meter?
Simply put, noise detectors include sound level meters, but the concept is broader and includes individual sound exposure meters.
The essence of sound is fluctuation, elastic wave. When the sound source vibrates, it causes the vibration of the nearby air particles. Depending on the inertia and elastic properties of the air, the vibration of the air particles spreads around in the form of waves, forming sound waves. The direction of particle vibration is parallel to the direction of wave propagation, which is called longitudinal wave. The waves in the air are called density waves. Sound waves can travel through gases, liquids, and solids.
Sound pressure: the difference between the pressure and the static pressure in the medium when there are sound waves. The unit is Pa.
Noise: From a physiological point of view, all sounds that interfere with people's rest, study and work, that is, unwanted sounds, are collectively referred to as noise.
Noise pollution is a kind of physical pollution.
With the further development of urbanization, industrialization and transportation, and the increase of population density, people pay more and more attention to noise pollution, and the proportion of complaints among many environmental problems is increasing year by year. Therefore, noise pollution has become an important part of environmental monitoring.
