Analysing and fixing common faults in noise meters
No display on the monitor
(1) The internal battery cable is disconnected or the battery contact is not good: weld the cable and replace the battery contact piece.
(2) Battery damage: replace the battery.
2. Measurement reading is obviously low or calibrated calibration can not 94.0dB
(1) Microphone sensitivity is too low or damaged: replace the microphone and recalibrate.
(2) Preamplifier contact with the microphone contact is not good: cleaning contact
(3) The preamplifier plug is not in good contact with the host socket: replace the plug socket.
3. High reading during low sound level measurement
Preamplifier ground contact is safe: tighten the outer sleeve.
Cautions
Read the instruction manual before use to understand how to use the instrument and precautions.
Install the battery or external power supply pay attention to the polarity, do not reverse the connection. Remove the battery when not in use for a long time to avoid liquid leakage and damage to the instrument.
Do not disassemble the microphone to prevent it from being thrown or dropped, and place it properly when not in use.
The instrument should be avoided to be placed in high temperature, humidity, sewage, dust and air or chemical gases with high content of hydrochloric acid and alkali.
Do not disassemble the instrument without permission. If the instrument is not normal, it can be sent to the repair unit or factory for overhaul.
