Portable sound level meter 30~130 dBA is new coming for the industry ,laboratory,home diy use
with smart sound probe.to monitor the environment noisy level of our life.
With backlit ,not the daytime,also the night,the mini sound meter can measuring the sound level easily
*This unit was designed according to following standards:
—-A. International electrician committee standard:
IEC PUB 651 TYPE2 —-B.US national standard: ANSI S1.4 TYPE2
*Measuring range: 30~130 dBA *Accuracy: ±1.5 dB
*Digit & Resolution: 4 digits & 0.1 dB
*Frequency response: 31.5Hz ~8.5KHz
*Frequency weighting characteristic: A
*Sampling rate: 2times/second
*Microphone：1/2inch polarization capacitance microphone
*Low battery indication
*Automatic power off
*Packing method: Blister + Card
*Power: 9V battery (6F22)
*Weight: 144g (including battery)
With the development of modern industry, environmental pollution with the generated noise pollution is a kind of environmental pollution has become a major hazard to humans. Noise pollution and water pollution, air pollution is seen as the three main environmental issues worldwide.
The noise is the sound shedder do not rule.
The sound caused by the object vibration transmitted in the form of waves in a certain medium (such as solid, liquid, gas). Usually hear the sound of air sound. Under normal circumstances, the human ear can hear the acoustic frequency is 20 ~ 20,000 Hz, referred to as an audible sound; less than 20Hz, called a sub-sonic; higher than 20,000 Hz, referred to as ultrasonic. Hear the pitch of the sound depends on the frequency of the sound waves, the high-frequency sounds sharp, and gives the impression of low-frequency sound is more dull. The size of the sound is determined by the strength of the sound. From a physical standpoint, the noise from a variety of different frequencies, different intensity sound messy, erratic combination; tone is harmonious sounds.
Determine a sound is a noise, judging only from the physics point of view is not enough, the subjective factors often play a decisive role. For example, the wonderful music people are listening to music tones, but for study, rest or concentrate on thinking of a noise. Even with one voice, when a person is in a different state, a different mood, the sound will produce different subjective judgments, the sound may become noise or tone. Thus, from a physiological point of view, any interference for people to rest, learning, and working the sound that is unwanted sound, collectively referred to as noise. When the adverse impact of noise on people and the surrounding environment, the formation of noise pollution.