Sound Level Meter - Analysis and Maintenance of Common Faults
Noise meters are mainly used to measure noise, and there are several classifications for noise measurement:
1. From the perspective of measuring objects, it can be divided into the measurement of environmental noise (sound field) characteristics and the measurement of sound source characteristics.
2. According to the temporal characteristics of the sound source or field, it can be divided into steady-state noise measurement and non-stationary noise measurement. Unsteady noise can be divided into periodic variation noise, irregular variation noise, and pulse sound.
3. According to the frequency characteristics of the sound source or field, it can be divided into broadband noise, narrowband noise, and noise containing prominent pure tone components.
4. According to the required accuracy of measurement, it can be divided into precision measurement, engineering measurement, and noise survey.
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.
(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. When measuring the low sound level, the reading is too high, and the ground wire of the preamplifier is in contact. Tighten the outer sleeve.
Noise meter - Precautions
1. Before use, read the instruction manual to understand the usage and precautions of the instrument.
2. 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.
3. Do not disassemble the microphone to prevent it from being thrown or dropped, and place it properly when not in use.
4. 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.
5. 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.
6. Pay attention to waterproofing of the noise meter to prevent it from falling from high altitude.
