Common faults of sound level meters and noise meters
Sound level meter display has no display
(1) The internal battery connection is disconnected or the battery contact is not good: solder the connection and replace the battery contact piece. (2) Battery is damaged: Replace the battery.
The measurement reading is obviously low or the calibration is less than 94.0dB.
(1) The microphone sensitivity is too low or damaged: Replace the microphone and recalibrate it.
(2) The contacts of the preamplifier are not in good contact with the microphone: clean the contacts.
(3) The preamplifier plug is not in good contact with the host socket: replace the plug socket.
3. When measuring low sound level, the reading is too high, and the ground wire of the preamplifier is in contact**: Tighten the outer sleeve.
Noise meter display shows nothing
(1) The internal battery connection is disconnected or the battery contact is not good: solder the connection and replace the battery contact piece. (2) Battery is damaged: Replace the battery.
2. The measurement reading is obviously low or the calibration is less than 94.0dB.
(1) The microphone sensitivity is too low or damaged: Replace the microphone and recalibrate it.
(2) The contacts of the preamplifier are not in good contact with the microphone: clean the contacts.
(3) The preamplifier plug is not in good contact with the host socket: replace the plug socket.
3. The reading is too high when measuring low sound level, and the ground wire of the preamplifier is in contact: tighten the outer sleeve.
Sound level meter classification
Sound level meters can be divided into precision sound level meters and ordinary sound level meters according to their accuracy. The measurement error of a precision sound level meter is about ±1dB, and that of an ordinary sound level meter is about ±3dB.
Sound level meters can be divided into two categories according to their uses: one is used to measure steady-state noise, and the other is used to measure unsteady-state noise and impulse noise.
Integral sound level meters are used to measure the equivalent sound level of unstable noise over a period of time. A noise dosimeter is also an integrating sound level meter, mainly used to measure noise exposure.
Pulse sound level meter is used to measure impulse noise. This sound level meter conforms to the human ear's response to impulse sound and the average time of the human ear's response to impulse sound.
