Noise meter detection method
The noise meter is mainly used to measure noise, and the classification of noise measurement mainly includes the following types: 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 measurement According to the required accuracy, it can be divided into precision measurement, engineering measurement and noise general survey, etc.; from the measurement object, it can be divided into the characteristic measurement of environmental noise and the measurement of sound source characteristics; from the time characteristics of the sound source or sound field , can be divided into steady-state noise measurement and unsteady-state noise measurement; unsteady-state noise can be divided into periodically changing noise, irregularly changing noise and impulsive sound.
When measuring and testing the noise meter, the instrument should select the correct gear according to the situation. Hold both sides of the noise meter flat with both hands, and the microphone points to the sound source to be measured. Extension cables and extension rods can also be used to reduce the appearance of the noise meter and the impact of the human body on the m
The sound level meter used by the noise machine to measure the noise, the response of the meter head can be divided into four types according to the sensitivity:
(1) "Slow". The time constant of the meter head is 1000 ms, which is generally used to measure steady-state noise, and the measured value is an effective value.
(2) "Fast". The time constant of the meter head is 125ms, which is generally used to measure unstable noise and traffic noise with large fluctuations. The fast gear is close to the human ear's response to sound.
(3) "Pulse or Pulse Hold". The rising time of the watch needle is 35ms, which is used to measure the pulse noise with a long duration, such as punch press, hammer, etc. The measured value is the maximum effective value.
(4) "Peak hold". The rise time of the watch hand is less than 20ms. It is used to measure short-duration pulse sounds, such as guns, cannons and explosions, and the measured value is the peak value. That is the maximum value. Distance Meter Altimeter Laser Line Projector Flowmeter GPS Thickness Gauge Leveler Flat Panel Waveform Recorder Test Fixture Voltage and Current Recorder Data Collector Graphic Recorder Flow Totalizer
