Dosimeters Sound level meters generally only measure the current sound levels. Time Weighting[ edit ] Graphs of Fast, Slow and Impulse time weightings applied so that sound levels measured are easier to read on a sound level meter.
Step 3: Add the number in the right-hand column to the highest of the two-decibel measurements you have. National standards permit the use of Class 2 instruments for regulatory compliance. Those that meet the lesser standards are called type 2 meters and are suitable for more general use, but not really for lab-quality measurements.
The microphone of the sound level meter contains a flexible membrane that moves slightly when the sound waves hit it. Automatic measurement guidance and aural feedback during measurements allow you to concentrate on making a smooth scan of the area under investigation.
Are any regulatory standards needed? This kind of longer-term analysis is a fairer and more accurate way of sensing whether sound is a nuisance or a health issue than simply relying on one or two instantaneous measurements. In equation form, intensity is is the power through an area.
A Fast measurement green line is quicker to react.
Peak Sound Pressure Measurements are made using the C- frequency weighting. You can also find some fairly good sound level apps for things like the iPhone, which do an even better job.
A-Weighting, with less lower and higher frequenciesand a slight boost in the mid-range, represents what humans are capable of hearing.