Noise meter - classification and usage method
Noise Meter - Classification
1. The measuring object can be separated into two categories: measurements of the properties of sound sources and measurements of the environmental noise (sound field).
2. Stable-state noise measurement and unstable-state noise measurement can be distinguished based on the time characteristics of the sound source or sound field. Periodic noise, irregular noise, and pulse sound are the three categories of non-stationary noise.
3. Broadband noise, narrowband noise, and noise with pronounced pure tone components can all be classified according to the frequency characteristics of the sound source or sound field.
4. Measurements can be classified as precision, engineering, noise survey, etc. based on the level of accuracy necessary.
Noise meter - how to use it
The accuracy of the measurement results will directly depend on how the noise meter is utilized. When measuring, the device should choose the appropriate setting for the circumstance and hold the noise in both hands.
According to the sensitivity of the meter head reaction, there are four categories of sound level meters used to measure noise:
1. "Slow". The measured value is an effective value, and the meter head's time constant is 1000 ms, which is typically used to monitor steady-state noise.
2. "Fast". The meter head's time constant, which is 125 ms, is typically used to monitor unstable noise and traffic noise with significant changes. The responsiveness of the human ear to sound is comparable to the fast gear.
3. "Hold or pulse." When measuring pulse noise with a long duration, such as that produced by a punch press or hammer, a watch's rising time of 35 ms is used. The maximum effective value is the measured value.
"Peak hold," 4. Less than 20 ms pass between the hands rising. The measured value is the peak value, and it is used to measure short-duration impulsive sounds like firearms, cannons, and explosions. The top value is that. A range finder, an altimeter, a laser liner, a flowmeter, a GPS thickness gauge, a leveler, a flat panel, a waveform recorder, a test fixture, a voltage and current recorder, a data recorder, a graphic recorder, and a flow totalizer are all examples of range finding equipment.
