By EasyHow
How to check the noise level
The noise is what prevents us, that is, sounds that annoy us in this place and at this time. Sound is a pressure variation that the human ear hears. The intensity of sound is measured by decibels. 0 dB is the threshold of hearing and 130 dB is the pain threshold of the person.There are many varieties of noise. And it is a natural noise, and environmental noise, and process noise, constant noise, and noise caused by the use of a particular subject, home appliance.
Instruction
To measure the level of noise of any appliance, you need to have plugged or polysiloxane the camera.
Measure the level of background noise in the empty cell at several points at a distance of 1 m from the walls, fixing the microphones in the right spots.
Calculate the average value of the background noise, which is taken as the mean value of the measurements. Fasten the measuring device on the spring suspension, set the microphones according to the standards and measure when the device.
Calculate the mean value of the noiseproduced by the device. For accurate determination of noise subtract the average value level of the noise working of the device the average value of the background noise.
Note
The perception of noise is different in all people. What looks like noise one, others do not cause negative emotions. That's why there is a scale of the noise in dB that determines the level of acceptable noise.
To measure the noise can household sound level meter. Sound level meter - a device which measures sound level in dB. Sound level meter consists of a microphone and voltmeter, calibrated in dB. The sound level measured in a given space over a period of time. At equal intervals of time are measurements that are recorded. Calculation of arithmetic mean values of the measurements will be accurate measurement of the noise level.
