Čimbenici utječu the selection of sound level meters
Sound level meters are uglavnom used to measure noise, and the classification of noise measurement uglavnom includes the following types:
1. From the measurement object, it can be divided into feature measurement of environmental noise (sound field) and measurement of sound source features.
2. From the time characteristics of the sound source or sound field, it can be divided into steady-state noise measurement and non-stationary noise measurement. Non steady state noise can also be divided into periodic variation noise, irregular variation noise, and pulse noise.
3. From the frequency karakteristike of the sound source or field, it can be divided into broadband noise, narrowband noise, noise and noise containing prominent pure tone components.
4. From the perspective of measurement accuracy requirements, it can be divided into precision measurement, engineering measurement, and noise survey.
A noise meter, also known as a sound level meter, is an instrument that measures the sound pressure level or sound level of sound sound accord to a certain frequency and time weights. It is a basic and commonly used instrument in aux measurement. Sound level meters can be used for mjer environmental noise, machine noise, Vehicle noise, Various Other Types of noise, As Well As for measurements such as electroacoustics and building acoustics. If a capacitive microphone is replaced with an accelerometer sensor and Equipped With An integrator, A Sound Level Meter Can Be Used To Measure Vibration.
In order to compare the measurement results of sound level meters produced in various countries around the world, the International Electrotechnical Commission (IEC) has formulated relevant standards for sound level meters and recommended them for use in various countries. In May 1979, the IEC651 "Sound Level Meters" standard was passed in Stockholm, and the national standard for sound level meters in China is GB3785-83 "Electrical and Sound Performance and Testing Methods for Sound Level Meters". In 1984, IEC passed the international standard IEC804 "Integrated Average Sound Level Meters", and in 1997, China issued GB/T17181-1997 "Integrated Average Sound Level Meters". They are consistent with the main requirements of IEC standards. In 2002, the International Electrotechnical Commission (IEC) released a new international standard, IEC61672-2002 "Sound Level Meters". This standard replaces the original IEC651-1979 "Sound Level Meters" and IEC804-1983 "Integrated Average Sound Level Meters". China has formulated the JJG188-2002 "Sound Level Meter" verification regulation based on this standard. According to the new standard, sound level meters can be divided into general purpose sound level meters, integrated sound level meters, spectral sound level meters, etc. According to accuracy, they can be divided into level 1 and level 2. The various performance indicators of the two levels of sound level meters have the same central value, but the allowable error is different, and as the level number increases, the allowable error is relaxed. According to volume, it can also be divided into desktop, portable, and pocket sound level meters. According to its indication method, it can be divided into analog indication and digital indication sound level meters.
