Classification of noise meters

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Whether a noise meter is used correctly has a direct impact on the accuracy of the measurement results. During measurement, the instrument should select the appropriate setting based on the circumstances. The sound level meter used for measuring noise has four types of gauge response depending on its sensitivity: 1. \"Slow\". The header time constant is 1000 ms, and it is generally used to measure steady-state noise; the value obtained is the effective value. 　　2. “Fast”. The header time constant is 125 ms, and it is generally used to measure unsteady noises with large fluctuations, as well as traffic noise. The fast setting is close to the way human ears respond to sound. 　　3. “Pulse or pulse hold”. The time for the hand to rise is 35 ms; this is used to measure pulse noises with a longer duration, such as those from punch presses or hammers, with the measured value being the maximum effective value. 4. “Peak Hold”. The rise time of the needle is less than 20 ms. It is used to measure pulse sounds with very short durations, such as those from guns, cannons, and explosions; the value obtained is the peak value, that is, the maximum value. Rangefinder, altimeter, laser line projector, flow meter, GPS thickness gauge, level, straightness tester, waveform recorder, testing fixture, voltage and current recorder, data collector, graphic recorder, flow integration meter.