How to Use a Sound Level Meter?
Hazards of Noise
Under the background of continuous economic and social development, noise has become a kind of environmental pollution, and has a rising trend, so it has attracted widespread attention of the society, and research in this area has become the focus of the industry. People are greatly injured, ranging from dull hearing, reduced work efficiency, and in more serious cases, deafness, fatigue, insomnia, and memory loss.
It is precisely because noise will bring huge harm to people and affect people's health, so it is necessary to make great efforts to develop noise reduction technology and strengthen noise detection methods. The effective way to prevent noise is to formulate various noise standards in the form of measurement and testing according to the different production and living environments.
How to use a sound level meter?
Preparation stage
Read the instruction manual carefully, and make preparations for its internal structure, performance, operation points and precautions.
Battery inspection and replacement
Multi-cell dry batteries are the most used in sound level meters, but batteries have their service life. Sometimes when the battery voltage is insufficient, the measured data will be inaccurate. This requires timely replacement of batteries when they are used to a certain extent. Usually, the sound level meter will set the indicator to check the battery status. Just press the battery check button, and the voltage of the battery can be displayed at a glance.
Accessories installation
Starting from the specific provisions of the manual, install and connect accessories according to the content of the measurement and specific conditions. After the installation and connection are completed, it needs to be checked first. When there is no error, it can be put into use. It is worth emphasizing that the power must be turned off before performing this series of operations. If it is dry weather, the static electricity of the human body should be discharged. When removing the microphone protector, take special care with the diaphragm to reduce accidental damage.
Calibration of sound level meters
Acoustic calibration.
Usually, there are piston sounder method, acoustic calibrator method, electrostatic exciter method, etc. The first two are used more frequently.
Calibrated with internal reference electrical signal.
Use the reference signal inside the sound level meter to calibrate the gain of the instrument. The main process of calibration is: check the mechanical zero position and battery voltage of the instrument; set the switch to the "Lin" calibration and "F" position, and preheat 3-5 minutes; find out the sensitivity correction value K of the microphone used on the microphone calibration chart.
The indicated value on the K value scale line should be the same as the value of the microphone; calibrate with the reference electrical signal in the machine, regard the sensitivity or value of the microphone as a known number, and then adjust the gain value of the amplifier to make the acoustic sensitivity of the whole machine. reach the specified value. It should be specially pointed out here that in the process of calibrating the internal reference signal, the overall acoustic sensitivity of the microphone cannot be directly calibrated. Subject to acoustic calibration. Therefore, from this calibration, the sound level meter should be regularly calibrated acoustically.
Noise measurement
After the above-mentioned calibration is qualified, the instrument will be subjected to noise measurement. In the process of measurement, several aspects should be paid attention to, which are explained as follows.
Environmental conditions.
The quality of the test environment will greatly affect the test results, so it is necessary to judge from the environment whether it is necessary to equip the microphone with a windshield, a nose cone or a random incidence modifier, so that it can be used to a large extent. to reduce the influence of the environment on the measurement results.
Calibration Specifications.
The measurement position should be selected according to the relevant specifications. In addition, the human body and surrounding objects will also affect the test. This is also an aspect that needs to be paid attention to, especially the direction of the microphone. The direction of the sound source remains the same.
Environment fixes.
Usually through visual inspection, in special cases, measurement methods can also be used to test the environment, and then determine whether it is necessary to correct the back noise of each test point and each weighted or frequency sound pressure level.
Switch position.
Starting from the measured object, select the position of the input and output range switches. The main purpose is to ensure that the indicated value of the sound level meter can be within the valid scale or the range of the displayed selection area, and the signal-to-noise ratio must be guaranteed. The signal is not distorted.
ATO professional sound level meter accurately measures noise for you. It has the advantages of simple operation and convenient use; it has the characteristics of large dynamic range, large-screen LCD digital display, automatic measurement and storage of various data, etc.
