Selection Techniques for Digital Noise Meters
A noise meter, also known as a sound level meter, is an instrument that measures the sound pressure level or sound level of sound according to a certain frequency and time weights. It is a basic and commonly used instrument in acoustic measurement. Sound level meters can be used for measuring environmental noise, machine noise, vehicle noise, and various other types of noise. They can also be used for measurements in electroacoustics, building acoustics, and other fields. If capacitive microphones are replaced with accelerometer sensors and integrated, sound level meters can be used to measure vibration. Humidity sensor probe, stainless steel electric heating tube PT100 sensor, cast aluminum heater, heating coil fluid solenoid valve
In order to compare the measurement results of sound level meters produced by countries around the world, the International Electrotechnical Commission (IEC) has formulated relevant standards for sound level meters and recommended them to be adopted by various countries. In May 1979, the IEC 651 "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 Meter, and in 1997, China issued GB/T17181-1997 Integrated Average Sound Level Meter. They are consistent with the main requirements of the IEC standard. In 2002, the International Electrotechnical Commission (IEC) released the 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 developed the JJG188-2002 "Sound Level Meter" calibration regulation based on this standard. According to the new standards, sound level meters can be divided into general sound level meters, integral sound level meters, spectral sound level meters, etc. according to their purposes, and can be divided into level 1 and level 2 based on accuracy. The various performance indicators of the two levels of sound level meters have the same central value, with only different allowable errors. Moreover, as the level number increases, the allowable errors are relaxed. According to volume, it can also be divided into desktop, portable, and pocket sound level meters. According to their indication methods, they can be divided into analog indication and digital indication sound level meters. Selection Techniques for Digital Noise Meters
Factors affecting the selection of sound level meters
The sound level meter is mainly used to measure noise, and the classification of noise measurement mainly includes the following:
1. From the perspective of the measurement object, it can be divided into the measurement of environmental noise (sound field) characteristics and the measurement of sound source characteristics.
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 be further divided into periodic variation noise, irregular variation noise, and pulse sound.
3. From the frequency characteristics of the sound source or sound field, it can be divided into broadband noise, narrowband noise, and noise containing prominent pure tone components. Selection Techniques for Digital Noise Meters
4.From the perspective of measurement accuracy requirements, it can be divided into precision measurement, engineering measurement, and noise survey.
