Measurement standards and precautions for noise meters
Factors affecting noise meters
Noise meters are mainly used to measure noise, and the classification of noise measurement mainly includes the following types:
1. From the perspective of the measurement object, it can be divided into the measurement of environmental noise (sound field) characteristics and the measurement of sound source characteristics.
2. From the time characteristics of the sound source or sound field, it can be divided into steady-state noise measurement and non-stationary noise measurement. Non steady state noise can be further divided into periodic variation noise, irregular variation noise, and pulse sound.
3. From 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. From the perspective of measurement accuracy requirements, it can be divided into precision measurement, engineering measurement, and noise survey.
Noise Meter - Analysis and Repair of Common Faults
1. No display on the monitor
(1) Internal battery connection disconnected or poor battery contact: Solder the connection 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) Poor contact between the contact point of the preamplifier and the microphone: Clean the contact point.
(3) Poor contact between the plug of the preamplifier and the host socket: replace the plug socket.
3. When measuring low sound levels, the reading is too high, and the ground wire of the preamplifier contacts * *: Tighten the outer sleeve.
Noise meter - precautions
1. Before use, you should read the instruction manual to understand the usage method and precautions of the instrument.
2. Pay attention to polarity when installing batteries or external power sources, and do not reverse connect them. If not in use for a long time, the battery should be removed to avoid liquid leakage and damage to the instrument.
3. Do not disassemble the microphone to prevent it from falling, and place it properly when not in use.
4. Instruments should be avoided from being placed in places with high temperature, humidity, sewage, dust, air or chemical gases containing high levels of hydrochloric acid and alkali.
5. Do not disassemble the instrument without authorization. If the instrument is abnormal, it can be sent to the repair unit or factory for maintenance.
6. Pay attention to waterproofing for noise meters to prevent falling from heights.
