What are the factors that affect the use and measurement of noise meters
Factors affecting the selection of noise meters
Noise meters are mainly used to measure noise, and the classification of noise measurement mainly includes the following:
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 sound field, it can be divided into broadband noise, narrowband noise, and noise containing prominent pure tone components.
From the perspective of measurement accuracy requirements, it can be divided into precision measurement, engineering measurement, and noise survey.
General usage methods of noise meters
The correct use of a noise meter directly affects the accuracy of the measurement results. Therefore, it is necessary to introduce the use of noise meters.
1. Precautions
a. Before use, it is necessary to read the instruction manual to understand the usage method and precautions of the instrument.
b. 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
Prevent liquid leakage from damaging the instrument.
c. Do not disassemble the microphone to prevent it from falling, and place it properly when not in use.
d. 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.
e. Do not disassemble the instrument without authorization. If the instrument is abnormal, it can be sent to the repair unit or factory for maintenance.
2. Sensitivity calibration is necessary before and after use to ensure measurement accuracy. Match 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.
3. Measurement method: When measuring, the instrument should choose the correct gear according to the situation, hold both sides of the noise meter flat with both hands, and point the microphone towards the measured sound source. Extension cables and rods can also be used to reduce the influence of the appearance of the noise meter and the human body on the measurement. The position of the microphone should be determined according to relevant regulations.
