Selection Skills of Digital Noise Meter
A noise meter, also called a sound level meter, is an instrument that measures the sound pressure level or sound level of sound according to a certain frequency weighting and time weighting. It is the most basic and most commonly used instrument in acoustic measurement. The sound level meter can be used for the measurement of environmental noise, machine noise, vehicle noise and various other noises, as well as the measurement of electroacoustics and architectural acoustics. If the condenser microphone is replaced by an accelerometer sensor and an integrator is added, Vibration can be measured with a sound level meter. Humidity Sensor Probe , , Stainless Steel Electric Heating Tube PT100 Sensor , , Cast Aluminum Heater , Heating Ring Fluid Solenoid Valve
In order to make the measurement results of sound level meters produced in various countries in the world comparable to each other, the International Electrotechnical Commission (IEC) formulated relevant standards for sound level meters and recommended that countries adopt them. In May 1979, IEC 651 "Sound Level Meter" was passed in Stockholm "Standard, my country's national standard for sound level meters is GB3785-83 "Sound Level Meter Electrical, Acoustic Performance and Test Methods". In 1984, IEC passed the international standard IEC804 "Integral Average Sound Level Meter", and our country promulgated GB/T17181-1997 "Integral Average Sound Level Meter" in 1997. They are mainly consistent with the IEC standard. In 2002, the International Electrotechnical Commission (IEC) released the new international standard IEC61672-2002 "Sound Level Meter". This standard replaces the original IEC651-1979 "Sound Level Meter" and IEC804-1983 "Integral Average Sound Level Meter". According to this standard, our country has formulated JJG188-2002 "Sound Level Meter" verification regulations. According to the new standard, the sound level meter can be divided into general sound level meter, integral sound level meter, spectrum sound level meter, etc. according to the purpose, and can be divided into level 1 and level 2 according to the accuracy. The performance indicators have the same central value, only the allowable error is different, and as the number of levels 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 meter. Selection Skills of Digital Noise Meter
1. 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 types:
1. From the measurement object, it can be divided into the characteristic measurement of environmental noise (sound field) 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 unsteady-state noise measurement. Non-stationary noise can be divided into periodic noise, irregular 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 Skills of Digital Noise Meter
4. From the accuracy of measurement requirements, it can be divided into precision measurement, engineering measurement and noise census.
2. Selection of sound level meters for several types of noise measurement Skills for selecting digital noise meters
For the sake of unification, some standards for noise measurement have been formulated internationally and domestically. These standards not only specify the method of noise measurement, but also specify the technical requirements for the use of sound level meters. We can use these standards to better understand Choose the right sound level meter.
