What are the factors that affect the measurement of a noise meter
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 types:
1. From the measurement object, it can be divided into feature measurement of environmental noise (sound field) and measurement of sound source features.
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 also be divided into periodic variation noise, irregular variation noise, and pulse noise.
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.
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, you should read the instruction manual to understand the usage methods and precautions of the instrument.
b. Pay attention to polarity when installing batteries or external power sources, and do not connect them in reverse. If not in use for a long time, the battery should be removed to avoid liquid leakage and damage to 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 areas with high temperature, humidity, sewage, dust, and 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 with 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 with both hands flat, and point the microphone towards the measured sound source. Extension cables and rods can also be used to reduce the impact of the noise meter appearance and human body on the measurement. The position of the microphone should be determined according to relevant regulations.
