Introduction to the use of level meter and fault analysis
1. Precautions
Before use, read the instruction manual to understand the usage and precautions of the instrument.
Pay attention to the polarity when installing batteries or external power sources, and do not reverse the connection. If not in use for a long time, the battery should be removed to prevent 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 from being placed in places with high temperature, humidity, sewage, dust, and air or chemical gases containing high levels of hydrochloric acid and alkali.
Do not disassemble the instrument without authorization. If the instrument is not functioning properly, it can be sent to a repair unit or factory for maintenance.
2. Sensitivity calibration
To ensure measurement accuracy, calibration should be performed before and after use.
Connect the sound level calibrator to the microphone, turn on the calibration power, read the value, adjust the sensitivity potentiometer of the sound level meter, and complete the calibration.
3. Measurement method
When measuring, the instrument should choose the correct gear according to the situation, hold the sound level meter horizontally on both sides with both hands, and point the microphone towards the measured sound source. Extension cables and extension rods can also be used to reduce the influence of the sound level meter's appearance and human body on the measurement. The position of the microphone should be determined according to relevant regulations.
Analysis and Repair of Common Malfunctions in Sound Level Meters
1. No display on the monitor
(1) Internal battery wiring disconnected or poor battery contact: Weld the wiring and replace the battery contact piece.
(2) Battery damage: Replace the battery.
2. The measurement reading is significantly low or cannot be calibrated to 94.0dB during calibration
(1) The sensitivity of the microphone is too low or damaged: replace the microphone and recalibrate it.
(2) The contact between the preamplifier and the microphone is not good: clean the contact
(3) The plug of the preamplifier is not in good contact with the host socket: replace the plug socket.
3. The reading is too high during low sound level measurement
