In order to compare the measurement results of noise meters produced in various countries around the world, the International Electrotechnical Commission (IEC) has formulated relevant standards for noise meters and recommended them for use in various countries. In May 1979, the IEC 651 "Noise Meters" standard was passed in Stockholm, and the national standard for noise meters in China is GB3785-83 "Electrical and Sound Performance and Testing Methods for Noise Meters". In 1984, IEC passed the international standard IEC804 "Integrated Average Noise Meter", and in 1997, China issued GB/T17181-1997 "Integrated Average Noise Meter". They are consistent with the main requirements of IEC standards. In 2002, the International Electrotechnical Commission (IEC) issued a new international standard, IEC61672-2002 "Noise Meters". This standard replaces the original IEC651-1979 "Noise Meter" and IEC804-1983 "Integral Average Noise Meter". China has formulated the JJG188-2002 "Noise Meter" verification regulation based on this standard. According to the new standard, noise meters can be divided into general purpose noise meters, integral noise meters, spectral noise meters, etc. According to accuracy, they can be divided into level 1 and level 2. The various performance indicators of the two levels of noise meters have the same central value, only with different allowable errors, and as the level number increases, the allowable errors are relaxed. According to volume, it can also be divided into desktop, portable, and pocket noise meters. According to its indication method, it can be divided into analog indication and digital indication noise meters.
Faktory ovlivňující výběr z šum měřiče
Hluk metry jsou hlavně používané k měření hluk a klasifikace šum měření hlavně zahrnuje následující typy% 3a
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-stacionary noise measurement. Non steady state noise can also be divided into periodic variation noise, irregular variation noise, and pulse noise.
3. From the frequency characteristics of the sound source or field, it can be divided into broadband noise, narrowband noise, and noise containing prominentní pure tone components.
4. Od the perspektiva z měření přesnost požadavky, it can be divided in precision measurement, engineering measurement, and noise survey.
