Basic knowledge of sound level meters and how to choose the right one?
Measuring range
The measurement range of the sound level meter is the main technical indicator of the sound level meter. This technical indicator represents the technological advancement of the product to a certain extent. Generally, it is hoped that the wider the measurement range, the better. The measurement upper limit of the sound level meter is determined by the maximum undistorted sound level of the sound level meter, which can generally reach 130 dB. If you need to measure high sound pressure levels (for example, 172 dB), you need to use a high sound pressure microphone. The lower measurement limit of a sound level meter is closely related to the self-generated noise of the sound level meter itself. If you are measuring low-level noise, choose a sound level meter equipped with a high-sensitivity microphone.
interface
Current sound level meters generally include RS232, USB and other interfaces for connecting to micro printers or computers. Users can choose according to testing needs. Some sound level meters also have wireless transmission capabilities. If the tester needs to be at a certain distance from the environment being measured during measurement, then it is most appropriate to choose a sound level meter with wireless capabilities.
Supporting calibrator
During the use of the sound level meter, a sound calibrator is required for sound calibration. The sound calibrator is often used as a supporting instrument for the sound level meter and becomes an integral part of the sound level meter. The sound calibrator should meet the requirements of GB/T 15173 for Class 1 or Class 2 sound calibrators. Class 1 sound level meters need to be calibrated with a Class 1 sound calibrator. Class 2 sound level meters need to use a Class 2 or Class 1 sound calibrator. calibration. It should be noted that some acoustic calibrators are greatly affected by altitude (mainly affected by atmospheric density) and need to be corrected, or an acoustic calibrator with less influence from air pressure should be selected to avoid affecting measurement accuracy.
