Noise meters' sensitivity calibration and affecting variables
In order to ensure the accuracy of the measurement, it should be calibrated before and after use.
Fit the sound level calibrator on the microphone, turn on the calibration power, read the value, adjust the sensitivity potentiometer of the noise meter, and complete the calibration.
Noise Meter - Influencing Factors
The noise 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.
4. From the accuracy of measurement requirements, it can be divided into precision measurement, engineering measurement and noise survey.
The composition and working principle of the noise analyzer
Noise analyzer, also known as noise meter (noise meter, sound level meter) is the most basic instrument in noise measurement. A sound level meter is generally composed of a condenser microphone, a preamplifier, a noise meter picture attenuator, an amplifier, a frequency meter network, and an effective value indicating meter.
The working principle of the sound level meter is: the microphone converts the sound into an electrical signal, and then the preamplifier transforms the impedance to match the microphone with the attenuator. The amplifier adds the output signal to the network, and then amplifies the signal to a certain amplitude through the attenuator and the amplifier, and sends it to the effective value detector.
