Sensitivity calibration and influencing factors for noise meters
Noise Meter - Sensitivity Calibration
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.
What should be paid attention to when using the sound level meter?
1) Before use, read the instruction manual to understand the use method and precautions of the instrument.
2) The instrument should not be placed in a place with high temperature, humidity, sewage, dust, air or chemical gas with high content of hydrochloric acid and alkali.
3) Pay attention to the polarity when installing the battery or external power supply, and do not reverse the connection. The battery should be removed when not in use for a long time, so as not to damage the instrument due to leakage.
4) Do not disassemble the microphone, prevent it from being thrown, and place it properly when not in use.
5) Do not disassemble the instrument without authorization. If the instrument is abnormal, it can be sent to the repair unit or the factory for inspection.
6). During use, if there is an undervoltage alarm in the LCD, the battery should be replaced in time.
7) Before the sound level meter is measured, it can be turned on and preheated for 2 minutes, and it can be preheated for 5 to 10 minutes in humid days.
