【Noise meter】Four common problems of noise meter
1. How to use the noise meter?
Whether the noise meter is used correctly or not will directly affect the accuracy of the measurement results. When measuring, the instrument should select the correct gear according to the situation, and hold it flat with both hands to make noise;
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.
In order to ensure the accuracy of the noise meter measurement, the noise meter should be calibrated with a sound level calibrator before and after use. Fit the sound level calibrator on the microphone, turn on the calibration power, read the value, adjust the sensitivity potentiometer of the sound level meter, and complete the calibration.
noise meter
Noise Meter How does the Noise Meter work? _Noise Meter
2. How to use the noise meter correctly
How to use the noise meter correctly
Whether the noise meter is used correctly or not will directly affect the accuracy of the measurement results. When measuring, the instrument should select the correct gear according to the situation, hold the sound level meter for noise measurement with two hands flat, and the response of the meter head can be divided into four types according to the sensitivity:
1. "Slow": The meter head time constant 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 hands is 35ms, which is used to measure long-lasting pulse noises, such as punch presses, hammers, etc. The measured values are the maximum effective values.
4. "Peak hold": The rise time of the hands is less than 20ms. It is used to measure short-duration impulsive sounds, such as gunshots and 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.
noise meter
Noise Meter Correct use of Noise Meter_Noise Meter
3. Solutions to common faults of the noise meter
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.
A 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) The sensitivity of the microphone 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.
4. Troubleshooting of the noise meter
Noise Meter Troubleshooting
Noise meter, also known as (noise meter, sound level meter) is the most basic instrument in noise measurement. A sound level 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 working principle of the sound level meter is:
The sound is converted into an electrical signal by the microphone, and then the impedance is transformed by the preamplifier to match the microphone with the attenuator.
The amplifier adds the output signal to the network, performs frequency weighting on the signal (or an external filter), and then amplifies the signal to a certain amplitude through the attenuator and the amplifier, and sends it to the RMS detector.
Daily faults and solutions of noise meter
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.
