Solutions for Noise Meter Common Errors
Nowadays, whether it is in life or work, it is inevitable that there will be a lot of noise. The generation of noise has an impact on our life and work. The noise meter is mainly used to measure environmental noise, do noise engineering, quality control and health prevention and control.
The noise meter is generally composed of a condenser microphone, a preamplifier, an attenuator, an amplifier, a frequency meter network, and an effective value indicating meter. The common faults of the noise meter generally have the following problems:
1. There is no display on the display
(1) The internal battery connection is disconnected or the battery contact is not good: solder the connection and replace the battery contact piece.
(2) The battery is damaged: replace the battery.
2. The measurement reading is obviously low or the calibration is less than 94.0dB.
(1) Microphone sensitivity is too low or damaged: replace the microphone and recalibrate.
(2) The contacts of the preamplifier are not in good contact with the microphone: clean the contacts.
(3) The plug of the preamplifier is not in good contact with the host socket: replace the plug socket.
3. The reading is too high during low sound level measurement, and the ground wire of the preamplifier is not in good contact: tighten the outer sleeve.
The sound level meter used to measure noise can be divided into four types according to the sensitivity of the meter head response:
1. "Slow": The time constant of the meter head is 1000ms, 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 rise time of the watch hand 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 hands is less than 20ms. It is used to measure short-duration impulsive sounds, such as explosions, and the measured value is the peak value. That is the maximum value. Range finder, altimeter, laser liner, flowmeter, GPS thickness gauge, leveler, flat panel, waveform recorder, test fixture, voltage and current recorder, data recorder, graphic recorder, and flow totalizer.
