Why do you need to calibrate your sound level meter before using it?
1. The measurement of the sound level meter is to convert the vibration wave of the air vibration caused by the sound signal (sound wave) to the vibration wave signal of the metal diaphragm of the microphone (microphone head) at the front end of the sound level meter into an electrical signal, and then after the special weighting network and circuit operation are amplified, the noise decibel value is displayed by digital or electric meter.
2. The quality of the air is unstable. For example, the temperature, humidity, and atmospheric pressure of the air will change at any time due to the influence of the environment and other factors. In order to ensure the accuracy of the air vibration signal received by the metal diaphragm of the microphone, the sensitivity of the microphone must be adjusted accordingly.
3. The process of adjusting the sensitivity of the microphone is to calibrate the sound level meter.
4. The national standard stipulates: "Measuring instruments must be calibrated with a sound level calibrator before and after measurement, and the deviation of the indicated value of the calibrated instrument shall not be greater than 0.5dB, otherwise the test is invalid."
Calibration method of sound level meter
1. After turning on the sound level meter, there will be four options of measurement, setting, reference, and calibration. The last option is the calibration option. Just move the cursor to this option.
2. After entering the calibration page, there will still be four options, which are review, calibration, application, and modification. Put the cursor on the second option calibration option, and then select the calibration option.
3. Insert the sensor of the sound level meter into the upgraded calibrator, and then turn on the switch of the calibrator, the calibrator will emit a standard sound level, and when everything is ready, press the calibration to start, and the instrument can be automatically calibrated.
4. When the data displayed by the sound level meter reaches 93.8dB (A), the instrument is calibrated.
