Classification of sound level meters
Sound level meter is the most basic instrument in measuring noise. It belongs to an electronic instrument. Sound level meter is generally composed of condenser microphone, preamplifier, attenuator, amplifier, frequency weighting network and RMS indicator. According to the sensitivity of the sound level meter, it can be divided into two categories, one is the ordinary sound level meter; the other is the precision sound level meter, which can also be divided into two categories according to the use of the sound level meter: One type is used to measure unsteady noise and impulse noise.
The sound level meter adopts advanced digital detection technology, which greatly improves the stability and reliability of the instrument. The sound level meter has the advantages of simple operation and convenient use; it has the characteristics of large dynamic range, large-screen LCD digital display, automatic measurement and storage of various data, etc.
Sound level meters can be widely used in industrial noise measurement and environmental noise measurement of various machines, vehicles, ships, electrical appliances, etc. field of acoustic testing.
Some common sense about the selection of sound level meters:
Sound level meters are divided into first and second levels. Many people do not understand what it means. To sum up, the accuracy is different. The first level accuracy is 0.7 decibels, while the second level is 1 decibel. The difference is not big, but the basic national standard , of course, the first-level is representative, so directly buy a first-level sound level meter for third parties or government agencies, and then according to the function, there are ordinary, integral, pulse, and spectrum. How to distinguish and recommend this, ordinary It is the direct reading of instantaneous, the integration is to have an average value over a period of time, and the pulse is simpler. You can understand that there is a noise with the most frequency in a period of time, and the spectrum can be understood to have a normal curve. The picture is for research, and professional recommendation should be made in the selection. Different units, different people, different industries and different environments use different instruments. For example, the third party uses the first-class Aihua, and the coal mine uses the explosion-proof mine safety and so on.
