When utilizing the sound level meter, what should be taken into consideration?
When measuring the noise meter, the instrument should select the correct gear according to the situation, hold both sides of the noise meter flat with both hands, and the microphone points to the sound source to be measured. Extension cables and extension rods can also be used to reduce the influence of the appearance of the noise meter and the human body on the measurement. . The position of the microphone should be determined according to relevant regulations.
The sound level meter used by the noise machine 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 1000 ms, 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 rising time of the watch needle 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 watch hand is less than 20ms. It is used to measure short-duration pulse sounds, such as guns, cannons and explosions, and the measured value is the peak value. That is the maximum value. Distance Meter Altimeter Laser Line Projector Flowmeter GPS Thickness Gauge Leveler Flat Panel Waveform Recorder Test Fixture Voltage and Current Recorder Data Collector Graphic Recorder Flow Totalizer
The sound level meter can be connected with an external filter and recorder to perform spectrum analysis on the noise. The domestic ND2 precision sound level meter is equipped with an octave page filter, which is easy to carry to the scene and do spectrum analysis. Process calibrator Temperature calibrator Pressure calibrator Loop calibrator Calibration buffer Clamp calibrator Oscilloscope calibrator Noise meter calibrator Current calibrator Multifunctional calibrator Humidity calibrator ph calibrator
