What should I pay attention to when using a sound level meter?
A sound level meter is the most basic noise measurement instrument. It is an electronic instrument, but different from objective electronic instruments such as voltmeters. When converting sound signals into electrical signals, the time characteristics of the human ear's response speed to sound waves can be simulated; The frequency characteristics with different sensitivities to high and low frequencies, as well as the intensity characteristics that change the frequency characteristics at different loudness levels. Therefore, a sound level meter is a subjective electronic instrument.
matters needing attention
1) Before use, read the instruction manual to understand the usage and precautions of the instrument.
2) 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.
3) 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.
4) Do not disassemble the microphone to prevent it from being thrown or dropped, and place it properly when not in use.
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). During use, if there is an undervoltage alarm in the LCD, the battery should be replaced in a timely manner.
7) Before measuring the sound level meter, it can be turned on and preheated for 2 minutes, and preheated for 5 to 10 minutes on humid days.
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 noise meter, and complete the calibration.
measuring method
When measuring, the instrument should choose the correct gear according to the situation, hold the noise meter 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 noise meter's appearance and human body on the measurement. The position of the microphone should be determined according to relevant regulations.
