The difference between noise detector and 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. Waves in 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.
How to use the sound level meter
1. Check the calibration of the sound level meter with a sound calibrator
2. Set the range switch to an appropriate position according to the size of the sound to be measured. If the size cannot be estimated, set it to "85-130"
3. Set the time weighting switch to the position specified in the standard; when the sound level is relatively stable, set it to "F" (fast); if the sound level changes sharply, set it to "S" (slow) 4. Set the reading sign switch Put in "5S" or "3S"
5. Put the power switch on "on"; when the instrument starts to work, it will display numbers
6. If the over-quantity mark "▲" (under-quantity mark "▼") is displayed on the right end of the display, the range switch should be moved up "or down" to make the range mark disappear. If the range mark cannot disappear, the measured sound level exceeds the measurement range of the instrument.
7. After adjusting the range of the sound level meter, you can read the measurement results from the display.
8. Make measurement records
9. After the measurement, it is recommended to check the sensitivity of the sound level meter with a sound calibrator to ensure the accuracy and reliability of the measurement data.
10. Set the power switch to "OFF". If the instrument will not be used for a long time, be sure to take out the battery.
