Noise meter - analysis and repair of common faults
1. There is no display on the 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 too high during low sound level measurement, and the ground wire of the preamplifier is in contact**: tighten the outer sleeve.
Noise Meter - Precautions
1. Read the instruction manual before use to understand the use method and precautions of the instrument.
2. Pay attention to the polarity when installing the battery or external power supply, and do not reverse the connection. The battery should be removed when not in use for a long time, so as not to damage the instrument due to leakage.
3. Do not disassemble the microphone, prevent it from being thrown, and place it properly when not in use.
4. The instrument should not be placed in a place with high temperature, humidity, sewage, dust, air or chemical gas with high content 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 the factory for inspection.
6. Pay attention to waterproof the noise meter to prevent it from falling from high altitude.
The scope of application of the noise meter
Since the noise meter is mainly used for environmental noise, it is suitable for noise detection and noise census in factories, offices, traffic roads, airports, audio, homes, farms and other places.
The noise meter is suitable for noise monitoring of household appliances, home audio and video sound testing, environmental noise in residential quarters, college laboratories, noise testing of enterprise workshops, and noise monitoring in urban environmental protection and other fields.
With the development of modern industry, environmental pollution is also produced. Noise pollution is a kind of environmental pollution, which has become a great harm to human beings. Traffic noise, construction noise, industrial noise, etc. affect people's normal study, life and rest. Although the noise from household appliances, audio equipment, etc. is not high, it is closely related to people's daily life, so people can't get quiet when they are resting, which is particularly annoying and can easily cause neighborhood disputes.
The standards of various countries and regions are not completely consistent. The International Organization for Standardization (ISO) stipulated in the allowable standard of environmental noise in 1971 that the allowable sound level of indoor ambient noise in residential areas is 35~45dB.
