About Noise and Noise Meter
First understand the sound:
The sound comes from the vibration of the object, if everything is still, there will be no sound! For example, the human voice is due to the vibration of the vocal cords.
The level of sound (tone), strength (loudness), and timbre are called the three elements of sound. The sound level is determined by the frequency of vibration. The higher the frequency, the sharper the sound.
The strength of the sound is determined by the vibration amplitude (amplitude) of the sound wave. The larger the amplitude, the higher the energy of the sound wave, so the sound is louder. Generally we use decibel (dB) to express the loudness of sound. The difference in timbre is determined by the waveform.
Source of sound
1. Noise: The sources of noise are mainly factories, entertainment venues, construction projects, and traffic noise.
2. The sound of music, TV, electrical equipment, beautiful musical instruments and songs ... or the sound broadcast on TV.
3. The sounds produced by nature: the sound of running water, the sound of birds ...
4. The voice of human speech and the cry of animals. Such as the teacher's voice, orchestra singing.
5. The sounds produced by mechanical equipment and office equipment, like the sounds produced by factory machinery and equipment during operation,
Or the fax machine, printer, computer typing sound in the office ...
Effects of sound on human body Noise damage: The most common cause of inner ear damage is noise. Various noises in a civilized society will accelerate the degradation and aging of the inner ear. In detail, more than eight hours in 90 decibel noise, more than four hours in 95 decibel noise, and more than two hours in 100 decibel noise will damage the inner ear. The impact of noisy sounds on the human body:
1. Noise reduces hearing ability and even becomes permanent deafness.
2. Noise causes psychological effects such as abnormal mood, irritability, and irritability.
3. Noise causes psychological effects such as increased heartbeat, increased blood pressure, and changes in sleep cycles.
Pleasant and proper volume of sound will relieve the tension of body and mind, relax people and restore spirit. It can also change the atmosphere, focus attention, relieve stress, help fall asleep, reduce sorrow, calm emotions, enrich feelings, eliminate physical and mental fatigue, etc.
About noise and how to measure the volume of the noise meter The noise meter AZ8921 AZ8922 AZ8925AZ8928 designed and produced by our company can be used to detect the volume. There are six measuring ranges, which are
30-80 decibels, 40-90 decibels, 50-100 decibels, 60-110 decibels, 70-120, 80-130 decibels, and the alarm value can be set, and a high decibel sound will be emitted as soon as the alarm value is reached. Equipped with automatic recovery function, as soon as the noise is reduced, the sound stops immediately.
In addition, with a unique background noise cancellation function, this key is designed for measuring the true maximum noise of the machine itself in the factory. And LCD display and backlight function, you can easily see the number of the display straight. In terms of accessories, it has analog output and RS232 functions to facilitate downloading data analysis.
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