How to use the noise meter correctly?
The correct use of noise meters directly affects the accuracy of measurement results. When measuring, the instrument should select the correct gear according to the situation. The sound level meter used for noise measurement noise with two hands, and the head response can be divided into four types according to the sensitivity:
1, "slow." The head time constant is 1000ms, which is generally used to measure the steady-state noise. The measured value is a valid value.
2, "fast." The head time constant is 125ms. It is generally used to measure fluctuations in unstable noise and traffic noise. Fast approaching the human ear to the sound response.
3, "pulse or pulse hold." The rise time of the hands is 35ms. It is used to measure pulse noise with long duration, such as punch press, hammer press, etc. The measured value is the maximum effective value.
4, "peak hold." The needle rise time is less than 20ms. Used to measure pulsed sounds with very short duration, such as guns, cannons, and explosions. The measured value is the peak value. The maximum value. Range finder altimeter laser line casting instrument flowmeter GPS thickness gauge level plate instrument waveform recorder test fixture voltage current recorder data set recorder graphic recorder flow totalizer.
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