Introduction To Noise and Sound

Noise can be defined as the presence of unwanted sound. Something that makes a sound must pulse the air back and forth, generating sound waves detectable by the human ear (in the range of about 20Hz to 20,000 Hertz). These "sound waves" strike our ear drums, which are moved by the changes in air pressure and enable us to perceive sound. Many workplace environments can be harmful, sometimes causing permanent damage, to our hearing.

How Does a Noise Meter Work?

Sound waves are measured using a microphone and converted into data which is displayed and/or logged into memory.

Sound and Noise General Information

Various dB levels and the corresponding reduction in actual sound pressure as well as the human perceived volume reduction for reducing noise levels.

Common sources of sound and their typical decibel levels, as well as OSHA exposure limits: