Cirrus Res., Inc., 6423 W. North Ave., Wauwatosa, WI 53213
Noise dosimeters have been undergoing a quiet revolution in recent years. They have progressed from the simple single reading dosimeter, into a multifunction general purpose noise measuring terminal. Dosimeters are available that can measure noise dose with two or three separate criterion levels as well as separate channels for peak, A-, and C-weighting. Time histories are stored and retrieved with durations as short as every 1/16 s for several hours. Exceedance levels are available along with time-weighted average, equivalent sound level per day, and many additional features. Readout is possible with front panel displays, printer interfaces, and computer storage. While functions have increased greatly, size and weight have been reduced. Electromagnetic susceptibility problems still exist but are being addressed in the current generation of dosimeters.