1. No display on the sound level meter 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) The battery is damaged: replace the battery.

2. The measurement reading is obviously low or the calibration is less than 94.0dB.
(1) Microphone sensitivity is too low or damaged: replace the microphone and recalibrate.

(2) The contacts of the preamplifier are not in good contact with the microphone: clean the contacts.

(3) The plug of the preamplifier is not in good contact with the host socket: replace the plug socket.

3. The reading is high during low sound level measurement, and the ground wire of the preamplifier is in contact: tighten the outer sleeve.

1. The noise 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) The battery is damaged: replace the battery.

2. The measurement reading is obviously low or the calibration is less than 94.0dB.

(1) Microphone sensitivity is too low or damaged: replace the microphone and recalibrate.

(2) The contacts of the preamplifier are not in good contact with the microphone: clean the contacts.

(3) The plug of the preamplifier is not in good contact with the host socket: replace the plug socket.

3. The reading is high during low sound level measurement, and the ground wire of the preamplifier is in contact: tighten the outer sleeve.

The accuracy of the sound level meter is: Class I accuracy ±0.7dB, Class II accuracy ±1dB, Class III accuracy ±1.5dB, ordinary sound level meter ±2dB

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.