How to use the sound level meter? What are the techniques?
The sound level meter is the most basic instrument in measuring noise. It belongs to an electronic instrument. The sound level meter is generally composed of a condenser microphone, a preamplifier, an attenuator, an amplifier, a frequency weighting network, and an effective value indicating meter. According to the sensitivity of the sound level meter, it can be divided into two categories, one is the ordinary sound level meter; state noise; one is used to measure unsteady state 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 of measurement range, large-screen LCD digital display, automatic measurement and storage of various data, etc.
The sound level meter can be widely used in industrial noise measurement and environmental noise measurement of various machines, vehicles, ships, electrical appliances, etc. It is suitable for factories, enterprises, architectural design, environmental protection, labor hygiene, transportation, teaching, medical and health, scientific research and other departments acoustic testing field.
Some common sense about sound level meter selection:
There are first and second grades of sound level meters. Many people don’t understand what it means. To sum it up, the accuracy is different. The first grade accuracy is 0.7 decibels, while the second grade is 1 decibel. The difference is not big, but basically the national standard , Of course, the first-level sound level meter is representative, so for third-party or government agencies, directly buy a first-level sound level meter. Secondly, according to the function, there are ordinary, integral, pulse, and spectrum. How to distinguish and recommend this? Ordinary The instantaneous one is the direct reading, and the integral one has an average value over a period of time. The pulse is even simpler. You can understand that there is a noise with the most frequency in a period of time. The spectrum can be understood to have a normal curve. The picture is for research, professional recommendation is required in the selection, different units, different people, different industries and different environments use different instruments, such as the third-party use Aiwa grade one, coal mines use explosion-proof mine safety and so on.
